| Message ID | 20200430203845.582900-10-ira.weiny@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Remove duplicated kmap code | expand |
On Thu, Apr 30, 2020 at 01:38:44PM -0700, ira.weiny@intel.com wrote: > -static inline void *kmap_atomic(struct page *page) > +static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) > { > preempt_disable(); > pagefault_disable(); > if (!PageHighMem(page)) > return page_address(page); > - return kmap_atomic_high(page); > + return kmap_atomic_high_prot(page, prot); > } > +#define kmap_atomic(page) kmap_atomic_prot(page, kmap_prot) OK, so it *was* just a bisect hazard - you return to original semantics wrt preempt_disable()...
On Fri, May 01, 2020 at 03:37:34AM +0100, Al Viro wrote: > On Thu, Apr 30, 2020 at 01:38:44PM -0700, ira.weiny@intel.com wrote: > > > -static inline void *kmap_atomic(struct page *page) > > +static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) > > { > > preempt_disable(); > > pagefault_disable(); > > if (!PageHighMem(page)) > > return page_address(page); > > - return kmap_atomic_high(page); > > + return kmap_atomic_high_prot(page, prot); > > } > > +#define kmap_atomic(page) kmap_atomic_prot(page, kmap_prot) > > OK, so it *was* just a bisect hazard - you return to original semantics > wrt preempt_disable()... FWIW, how about doing the following: just before #5/10 have a patch that would touch only microblaze, ppc and x86 splitting their kmap_atomic_prot() into an inline helper + kmap_atomic_high_prot(). Then your #5 would leave their kmap_atomic_prot() as-is (it would use kmap_atomic_prot_high() instead). The rest of the series plays out pretty much the same way it does now, and wrappers on those 3 architectures would go away when an identical generic one is introduced in this commit (#9/10). AFAICS, that would avoid the bisect hazard and might even end up with less noise in the patches...
On Thu, Apr 30, 2020 at 01:38:44PM -0700, ira.weiny@intel.com wrote: > From: Ira Weiny <ira.weiny@intel.com> > > To support kmap_atomic_prot(), all architectures need to support > protections passed to their kmap_atomic_high() function. Pass > protections into kmap_atomic_high() and change the name to > kmap_atomic_high_prot() to match. > > Then define kmap_atomic_prot() as a core function which calls > kmap_atomic_high_prot() when needed. > > Finally, redefine kmap_atomic() as a wrapper of kmap_atomic_prot() with > the default kmap_prot exported by the architectures. Looks good, Reviewed-by: Christoph Hellwig <hch@lst.de> But can you also consolidate the kmap_atomic_high_prot and kunmap_atomic_high in linux/highmem.h instead of keeping the duplicates in all arch headers? > > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > --- > arch/arc/include/asm/highmem.h | 2 +- > arch/arc/mm/highmem.c | 6 +++--- > arch/arm/include/asm/highmem.h | 2 +- > arch/arm/mm/highmem.c | 6 +++--- > arch/csky/include/asm/highmem.h | 2 +- > arch/csky/mm/highmem.c | 6 +++--- > arch/microblaze/include/asm/highmem.h | 7 +------ > arch/microblaze/mm/highmem.c | 4 ++-- > arch/mips/include/asm/highmem.h | 2 +- > arch/mips/mm/highmem.c | 6 +++--- > arch/nds32/include/asm/highmem.h | 2 +- > arch/nds32/mm/highmem.c | 6 +++--- > arch/powerpc/include/asm/highmem.h | 8 +------- > arch/powerpc/mm/highmem.c | 4 ++-- > arch/sparc/include/asm/highmem.h | 2 +- > arch/sparc/mm/highmem.c | 6 +++--- > arch/x86/include/asm/highmem.h | 6 +----- > arch/x86/mm/highmem_32.c | 4 ++-- > arch/xtensa/include/asm/highmem.h | 2 +- > arch/xtensa/mm/highmem.c | 6 +++--- > include/linux/highmem.h | 5 +++-- > 21 files changed, 40 insertions(+), 54 deletions(-) > > diff --git a/arch/arc/include/asm/highmem.h b/arch/arc/include/asm/highmem.h > index e16531495620..09f86bde6809 100644 > --- a/arch/arc/include/asm/highmem.h > +++ b/arch/arc/include/asm/highmem.h > @@ -30,7 +30,7 @@ > > #include <asm/cacheflush.h> > > -extern void *kmap_atomic_high(struct page *page); > +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); > extern void kunmap_atomic_high(void *kvaddr); > > extern void kmap_init(void); > diff --git a/arch/arc/mm/highmem.c b/arch/arc/mm/highmem.c > index 5d3eab4ac0b0..479b0d72d3cf 100644 > --- a/arch/arc/mm/highmem.c > +++ b/arch/arc/mm/highmem.c > @@ -49,7 +49,7 @@ > extern pte_t * pkmap_page_table; > static pte_t * fixmap_page_table; > > -void *kmap_atomic_high(struct page *page) > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) > { > int idx, cpu_idx; > unsigned long vaddr; > @@ -59,11 +59,11 @@ void *kmap_atomic_high(struct page *page) > vaddr = FIXMAP_ADDR(idx); > > set_pte_at(&init_mm, vaddr, fixmap_page_table + idx, > - mk_pte(page, kmap_prot)); > + mk_pte(page, prot)); > > return (void *)vaddr; > } > -EXPORT_SYMBOL(kmap_atomic_high); > +EXPORT_SYMBOL(kmap_atomic_high_prot); > > void kunmap_atomic_high(void *kv) > { > diff --git a/arch/arm/include/asm/highmem.h b/arch/arm/include/asm/highmem.h > index a9d5e9bce1cc..e35f2f73f6aa 100644 > --- a/arch/arm/include/asm/highmem.h > +++ b/arch/arm/include/asm/highmem.h > @@ -60,7 +60,7 @@ static inline void *kmap_high_get(struct page *page) > * when CONFIG_HIGHMEM is not set. > */ > #ifdef CONFIG_HIGHMEM > -extern void *kmap_atomic_high(struct page *page); > +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); > extern void kunmap_atomic_high(void *kvaddr); > extern void *kmap_atomic_pfn(unsigned long pfn); > #endif > diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c > index ac8394655a6e..e013f6b81328 100644 > --- a/arch/arm/mm/highmem.c > +++ b/arch/arm/mm/highmem.c > @@ -31,7 +31,7 @@ static inline pte_t get_fixmap_pte(unsigned long vaddr) > return *ptep; > } > > -void *kmap_atomic_high(struct page *page) > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) > { > unsigned int idx; > unsigned long vaddr; > @@ -67,11 +67,11 @@ void *kmap_atomic_high(struct page *page) > * in place, so the contained TLB flush ensures the TLB is updated > * with the new mapping. > */ > - set_fixmap_pte(idx, mk_pte(page, kmap_prot)); > + set_fixmap_pte(idx, mk_pte(page, prot)); > > return (void *)vaddr; > } > -EXPORT_SYMBOL(kmap_atomic_high); > +EXPORT_SYMBOL(kmap_atomic_high_prot); > > void kunmap_atomic_high(void *kvaddr) > { > diff --git a/arch/csky/include/asm/highmem.h b/arch/csky/include/asm/highmem.h > index 5bbbe59e60a9..59854c7ccf78 100644 > --- a/arch/csky/include/asm/highmem.h > +++ b/arch/csky/include/asm/highmem.h > @@ -32,7 +32,7 @@ extern pte_t *pkmap_page_table; > > #define ARCH_HAS_KMAP_FLUSH_TLB > extern void kmap_flush_tlb(unsigned long addr); > -extern void *kmap_atomic_high(struct page *page); > +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); > extern void kunmap_atomic_high(void *kvaddr); > extern void *kmap_atomic_pfn(unsigned long pfn); > extern struct page *kmap_atomic_to_page(void *ptr); > diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c > index f4311669b5bb..3ae5c8cd7619 100644 > --- a/arch/csky/mm/highmem.c > +++ b/arch/csky/mm/highmem.c > @@ -21,7 +21,7 @@ EXPORT_SYMBOL(kmap_flush_tlb); > > EXPORT_SYMBOL(kmap); > > -void *kmap_atomic_high(struct page *page) > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) > { > unsigned long vaddr; > int idx, type; > @@ -32,12 +32,12 @@ void *kmap_atomic_high(struct page *page) > #ifdef CONFIG_DEBUG_HIGHMEM > BUG_ON(!pte_none(*(kmap_pte - idx))); > #endif > - set_pte(kmap_pte-idx, mk_pte(page, kmap_prot)); > + set_pte(kmap_pte-idx, mk_pte(page, prot)); > flush_tlb_one((unsigned long)vaddr); > > return (void *)vaddr; > } > -EXPORT_SYMBOL(kmap_atomic_high); > +EXPORT_SYMBOL(kmap_atomic_high_prot); > > void kunmap_atomic_high(void *kvaddr) > { > diff --git a/arch/microblaze/include/asm/highmem.h b/arch/microblaze/include/asm/highmem.h > index 66521fdc3a47..eb0a2cb883bd 100644 > --- a/arch/microblaze/include/asm/highmem.h > +++ b/arch/microblaze/include/asm/highmem.h > @@ -51,14 +51,9 @@ extern pte_t *pkmap_page_table; > #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) > #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) > > -extern void *kmap_atomic_prot(struct page *page, pgprot_t prot); > +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); > extern void kunmap_atomic_high(void *kvaddr); > > -static inline void *kmap_atomic_high(struct page *page) > -{ > - return kmap_atomic_prot(page, kmap_prot); > -} > - > #define flush_cache_kmaps() { flush_icache(); flush_dcache(); } > > #endif /* __KERNEL__ */ > diff --git a/arch/microblaze/mm/highmem.c b/arch/microblaze/mm/highmem.c > index 1026aeffe11a..ee8a422b2b76 100644 > --- a/arch/microblaze/mm/highmem.c > +++ b/arch/microblaze/mm/highmem.c > @@ -32,7 +32,7 @@ > */ > #include <asm/tlbflush.h> > > -void *kmap_atomic_prot(struct page *page, pgprot_t prot) > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) > { > > unsigned long vaddr; > @@ -49,7 +49,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot) > > return (void *) vaddr; > } > -EXPORT_SYMBOL(kmap_atomic_prot); > +EXPORT_SYMBOL(kmap_atomic_high_prot); > > void kunmap_atomic_high(void *kvaddr) > { > diff --git a/arch/mips/include/asm/highmem.h b/arch/mips/include/asm/highmem.h > index d9f774bd4938..c9f46b450a68 100644 > --- a/arch/mips/include/asm/highmem.h > +++ b/arch/mips/include/asm/highmem.h > @@ -48,7 +48,7 @@ extern pte_t *pkmap_page_table; > > #define ARCH_HAS_KMAP_FLUSH_TLB > extern void kmap_flush_tlb(unsigned long addr); > -extern void *kmap_atomic_high(struct page *page); > +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); > extern void kunmap_atomic_high(void *kvaddr); > extern void *kmap_atomic_pfn(unsigned long pfn); > > diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c > index 87023bd1a33c..37e244cdb14e 100644 > --- a/arch/mips/mm/highmem.c > +++ b/arch/mips/mm/highmem.c > @@ -18,7 +18,7 @@ void kmap_flush_tlb(unsigned long addr) > } > EXPORT_SYMBOL(kmap_flush_tlb); > > -void *kmap_atomic_high(struct page *page) > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) > { > unsigned long vaddr; > int idx, type; > @@ -29,12 +29,12 @@ void *kmap_atomic_high(struct page *page) > #ifdef CONFIG_DEBUG_HIGHMEM > BUG_ON(!pte_none(*(kmap_pte - idx))); > #endif > - set_pte(kmap_pte-idx, mk_pte(page, kmap_prot)); > + set_pte(kmap_pte-idx, mk_pte(page, prot)); > local_flush_tlb_one((unsigned long)vaddr); > > return (void*) vaddr; > } > -EXPORT_SYMBOL(kmap_atomic_high); > +EXPORT_SYMBOL(kmap_atomic_high_prot); > > void kunmap_atomic_high(void *kvaddr) > { > diff --git a/arch/nds32/include/asm/highmem.h b/arch/nds32/include/asm/highmem.h > index 97648b678108..1f9fc74d112d 100644 > --- a/arch/nds32/include/asm/highmem.h > +++ b/arch/nds32/include/asm/highmem.h > @@ -51,7 +51,7 @@ extern void kmap_init(void); > * when CONFIG_HIGHMEM is not set. > */ > #ifdef CONFIG_HIGHMEM > -extern void *kmap_atomic_high(struct page *page); > +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); > extern void kunmap_atomic_high(void *kvaddr); > extern void *kmap_atomic_pfn(unsigned long pfn); > extern struct page *kmap_atomic_to_page(void *ptr); > diff --git a/arch/nds32/mm/highmem.c b/arch/nds32/mm/highmem.c > index 809f8c830f06..63ded527c1e8 100644 > --- a/arch/nds32/mm/highmem.c > +++ b/arch/nds32/mm/highmem.c > @@ -10,7 +10,7 @@ > #include <asm/fixmap.h> > #include <asm/tlbflush.h> > > -void *kmap_atomic_high(struct page *page) > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) > { > unsigned int idx; > unsigned long vaddr, pte; > @@ -21,7 +21,7 @@ void *kmap_atomic_high(struct page *page) > > idx = type + KM_TYPE_NR * smp_processor_id(); > vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); > - pte = (page_to_pfn(page) << PAGE_SHIFT) | (kmap_prot); > + pte = (page_to_pfn(page) << PAGE_SHIFT) | prot; > ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); > set_pte(ptep, pte); > > @@ -32,7 +32,7 @@ void *kmap_atomic_high(struct page *page) > return (void *)vaddr; > } > > -EXPORT_SYMBOL(kmap_atomic_high); > +EXPORT_SYMBOL(kmap_atomic_high_prot); > > void kunmap_atomic_high(void *kvaddr) > { > diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h > index d264aebcaa9b..edd01bbe5a44 100644 > --- a/arch/powerpc/include/asm/highmem.h > +++ b/arch/powerpc/include/asm/highmem.h > @@ -59,15 +59,9 @@ extern pte_t *pkmap_page_table; > #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) > #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) > > -extern void *kmap_atomic_prot(struct page *page, pgprot_t prot); > +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); > extern void kunmap_atomic_high(void *kvaddr); > > -static inline void *kmap_atomic_high(struct page *page) > -{ > - return kmap_atomic_prot(page, kmap_prot); > -} > - > - > #define flush_cache_kmaps() flush_cache_all() > > #endif /* __KERNEL__ */ > diff --git a/arch/powerpc/mm/highmem.c b/arch/powerpc/mm/highmem.c > index 162958321e28..35071c2913f1 100644 > --- a/arch/powerpc/mm/highmem.c > +++ b/arch/powerpc/mm/highmem.c > @@ -24,7 +24,7 @@ > #include <linux/highmem.h> > #include <linux/module.h> > > -void *kmap_atomic_prot(struct page *page, pgprot_t prot) > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) > { > unsigned long vaddr; > int idx, type; > @@ -38,7 +38,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot) > > return (void*) vaddr; > } > -EXPORT_SYMBOL(kmap_atomic_prot); > +EXPORT_SYMBOL(kmap_atomic_high_prot); > > void kunmap_atomic_high(void *kvaddr) > { > diff --git a/arch/sparc/include/asm/highmem.h b/arch/sparc/include/asm/highmem.h > index 94dd6e4c5fa4..d5c5700672de 100644 > --- a/arch/sparc/include/asm/highmem.h > +++ b/arch/sparc/include/asm/highmem.h > @@ -50,7 +50,7 @@ void kmap_init(void) __init; > > #define PKMAP_END (PKMAP_ADDR(LAST_PKMAP)) > > -void *kmap_atomic_high(struct page *page); > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); > void kunmap_atomic_high(void *kvaddr); > > #define flush_cache_kmaps() flush_cache_all() > diff --git a/arch/sparc/mm/highmem.c b/arch/sparc/mm/highmem.c > index 9f06d75e88e1..414f578d1e57 100644 > --- a/arch/sparc/mm/highmem.c > +++ b/arch/sparc/mm/highmem.c > @@ -54,7 +54,7 @@ void __init kmap_init(void) > kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE); > } > > -void *kmap_atomic_high(struct page *page) > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) > { > unsigned long vaddr; > long idx, type; > @@ -73,7 +73,7 @@ void *kmap_atomic_high(struct page *page) > #ifdef CONFIG_DEBUG_HIGHMEM > BUG_ON(!pte_none(*(kmap_pte-idx))); > #endif > - set_pte(kmap_pte-idx, mk_pte(page, kmap_prot)); > + set_pte(kmap_pte-idx, mk_pte(page, prot)); > /* XXX Fix - Anton */ > #if 0 > __flush_tlb_one(vaddr); > @@ -83,7 +83,7 @@ void *kmap_atomic_high(struct page *page) > > return (void*) vaddr; > } > -EXPORT_SYMBOL(kmap_atomic_high); > +EXPORT_SYMBOL(kmap_atomic_high_prot); > > void kunmap_atomic_high(void *kvaddr) > { > diff --git a/arch/x86/include/asm/highmem.h b/arch/x86/include/asm/highmem.h > index ff87aba96eee..009b8e22e906 100644 > --- a/arch/x86/include/asm/highmem.h > +++ b/arch/x86/include/asm/highmem.h > @@ -58,11 +58,7 @@ extern unsigned long highstart_pfn, highend_pfn; > #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) > #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) > > -extern void *kmap_atomic_prot(struct page *page, pgprot_t prot); > -void *kmap_atomic_high(struct page *page) > -{ > - return kmap_atomic_prot(page, kmap_prot); > -} > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); > void kunmap_atomic_high(void *kvaddr); > void *kmap_atomic_pfn(unsigned long pfn); > void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot); > diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c > index af07a6842743..075fe51317b0 100644 > --- a/arch/x86/mm/highmem_32.c > +++ b/arch/x86/mm/highmem_32.c > @@ -4,7 +4,7 @@ > #include <linux/swap.h> /* for totalram_pages */ > #include <linux/memblock.h> > > -void *kmap_atomic_prot(struct page *page, pgprot_t prot) > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) > { > unsigned long vaddr; > int idx, type; > @@ -18,7 +18,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot) > > return (void *)vaddr; > } > -EXPORT_SYMBOL(kmap_atomic_prot); > +EXPORT_SYMBOL(kmap_atomic_high_prot); > > /* > * This is the same as kmap_atomic() but can map memory that doesn't > diff --git a/arch/xtensa/include/asm/highmem.h b/arch/xtensa/include/asm/highmem.h > index a60a02dc68f6..7152aeb1e3a4 100644 > --- a/arch/xtensa/include/asm/highmem.h > +++ b/arch/xtensa/include/asm/highmem.h > @@ -68,7 +68,7 @@ static inline void flush_cache_kmaps(void) > flush_cache_all(); > } > > -void *kmap_atomic_high(struct page *page); > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); > void kunmap_atomic_high(void *kvaddr); > > void kmap_init(void); > diff --git a/arch/xtensa/mm/highmem.c b/arch/xtensa/mm/highmem.c > index 8c58c4c37033..fe56644d7b23 100644 > --- a/arch/xtensa/mm/highmem.c > +++ b/arch/xtensa/mm/highmem.c > @@ -37,7 +37,7 @@ static inline enum fixed_addresses kmap_idx(int type, unsigned long color) > color; > } > > -void *kmap_atomic_high(struct page *page) > +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) > { > enum fixed_addresses idx; > unsigned long vaddr; > @@ -48,11 +48,11 @@ void *kmap_atomic_high(struct page *page) > #ifdef CONFIG_DEBUG_HIGHMEM > BUG_ON(!pte_none(*(kmap_pte + idx))); > #endif > - set_pte(kmap_pte + idx, mk_pte(page, kmap_prot)); > + set_pte(kmap_pte + idx, mk_pte(page, prot)); > > return (void *)vaddr; > } > -EXPORT_SYMBOL(kmap_atomic_high); > +EXPORT_SYMBOL(kmap_atomic_high_prot); > > void kunmap_atomic_high(void *kvaddr) > { > diff --git a/include/linux/highmem.h b/include/linux/highmem.h > index 601df07607a4..b10e8a39ae60 100644 > --- a/include/linux/highmem.h > +++ b/include/linux/highmem.h > @@ -74,14 +74,15 @@ static inline void kunmap(struct page *page) > * be used in IRQ contexts, so in some (very limited) cases we need > * it. > */ > -static inline void *kmap_atomic(struct page *page) > +static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) > { > preempt_disable(); > pagefault_disable(); > if (!PageHighMem(page)) > return page_address(page); > - return kmap_atomic_high(page); > + return kmap_atomic_high_prot(page, prot); > } > +#define kmap_atomic(page) kmap_atomic_prot(page, kmap_prot) > > /* declarations for linux/mm/highmem.c */ > unsigned int nr_free_highpages(void); > -- > 2.25.1 > ---end quoted text---
On Fri, May 01, 2020 at 04:20:20AM +0100, Al Viro wrote: > On Fri, May 01, 2020 at 03:37:34AM +0100, Al Viro wrote: > > On Thu, Apr 30, 2020 at 01:38:44PM -0700, ira.weiny@intel.com wrote: > > > > > -static inline void *kmap_atomic(struct page *page) > > > +static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) > > > { > > > preempt_disable(); > > > pagefault_disable(); > > > if (!PageHighMem(page)) > > > return page_address(page); > > > - return kmap_atomic_high(page); > > > + return kmap_atomic_high_prot(page, prot); > > > } > > > +#define kmap_atomic(page) kmap_atomic_prot(page, kmap_prot) > > > > OK, so it *was* just a bisect hazard - you return to original semantics > > wrt preempt_disable()... > > FWIW, how about doing the following: just before #5/10 have a patch > that would touch only microblaze, ppc and x86 splitting their > kmap_atomic_prot() into an inline helper + kmap_atomic_high_prot(). > Then your #5 would leave their kmap_atomic_prot() as-is (it would > use kmap_atomic_prot_high() instead). The rest of the series plays > out pretty much the same way it does now, and wrappers on those > 3 architectures would go away when an identical generic one is > introduced in this commit (#9/10). > > AFAICS, that would avoid the bisect hazard and might even end > up with less noise in the patches... This works. V2 coming out shortly. Thanks for catching this, Ira
diff --git a/arch/arc/include/asm/highmem.h b/arch/arc/include/asm/highmem.h index e16531495620..09f86bde6809 100644 --- a/arch/arc/include/asm/highmem.h +++ b/arch/arc/include/asm/highmem.h @@ -30,7 +30,7 @@ #include <asm/cacheflush.h> -extern void *kmap_atomic_high(struct page *page); +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); extern void kunmap_atomic_high(void *kvaddr); extern void kmap_init(void); diff --git a/arch/arc/mm/highmem.c b/arch/arc/mm/highmem.c index 5d3eab4ac0b0..479b0d72d3cf 100644 --- a/arch/arc/mm/highmem.c +++ b/arch/arc/mm/highmem.c @@ -49,7 +49,7 @@ extern pte_t * pkmap_page_table; static pte_t * fixmap_page_table; -void *kmap_atomic_high(struct page *page) +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { int idx, cpu_idx; unsigned long vaddr; @@ -59,11 +59,11 @@ void *kmap_atomic_high(struct page *page) vaddr = FIXMAP_ADDR(idx); set_pte_at(&init_mm, vaddr, fixmap_page_table + idx, - mk_pte(page, kmap_prot)); + mk_pte(page, prot)); return (void *)vaddr; } -EXPORT_SYMBOL(kmap_atomic_high); +EXPORT_SYMBOL(kmap_atomic_high_prot); void kunmap_atomic_high(void *kv) { diff --git a/arch/arm/include/asm/highmem.h b/arch/arm/include/asm/highmem.h index a9d5e9bce1cc..e35f2f73f6aa 100644 --- a/arch/arm/include/asm/highmem.h +++ b/arch/arm/include/asm/highmem.h @@ -60,7 +60,7 @@ static inline void *kmap_high_get(struct page *page) * when CONFIG_HIGHMEM is not set. */ #ifdef CONFIG_HIGHMEM -extern void *kmap_atomic_high(struct page *page); +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); extern void kunmap_atomic_high(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); #endif diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c index ac8394655a6e..e013f6b81328 100644 --- a/arch/arm/mm/highmem.c +++ b/arch/arm/mm/highmem.c @@ -31,7 +31,7 @@ static inline pte_t get_fixmap_pte(unsigned long vaddr) return *ptep; } -void *kmap_atomic_high(struct page *page) +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { unsigned int idx; unsigned long vaddr; @@ -67,11 +67,11 @@ void *kmap_atomic_high(struct page *page) * in place, so the contained TLB flush ensures the TLB is updated * with the new mapping. */ - set_fixmap_pte(idx, mk_pte(page, kmap_prot)); + set_fixmap_pte(idx, mk_pte(page, prot)); return (void *)vaddr; } -EXPORT_SYMBOL(kmap_atomic_high); +EXPORT_SYMBOL(kmap_atomic_high_prot); void kunmap_atomic_high(void *kvaddr) { diff --git a/arch/csky/include/asm/highmem.h b/arch/csky/include/asm/highmem.h index 5bbbe59e60a9..59854c7ccf78 100644 --- a/arch/csky/include/asm/highmem.h +++ b/arch/csky/include/asm/highmem.h @@ -32,7 +32,7 @@ extern pte_t *pkmap_page_table; #define ARCH_HAS_KMAP_FLUSH_TLB extern void kmap_flush_tlb(unsigned long addr); -extern void *kmap_atomic_high(struct page *page); +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); extern void kunmap_atomic_high(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); extern struct page *kmap_atomic_to_page(void *ptr); diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c index f4311669b5bb..3ae5c8cd7619 100644 --- a/arch/csky/mm/highmem.c +++ b/arch/csky/mm/highmem.c @@ -21,7 +21,7 @@ EXPORT_SYMBOL(kmap_flush_tlb); EXPORT_SYMBOL(kmap); -void *kmap_atomic_high(struct page *page) +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { unsigned long vaddr; int idx, type; @@ -32,12 +32,12 @@ void *kmap_atomic_high(struct page *page) #ifdef CONFIG_DEBUG_HIGHMEM BUG_ON(!pte_none(*(kmap_pte - idx))); #endif - set_pte(kmap_pte-idx, mk_pte(page, kmap_prot)); + set_pte(kmap_pte-idx, mk_pte(page, prot)); flush_tlb_one((unsigned long)vaddr); return (void *)vaddr; } -EXPORT_SYMBOL(kmap_atomic_high); +EXPORT_SYMBOL(kmap_atomic_high_prot); void kunmap_atomic_high(void *kvaddr) { diff --git a/arch/microblaze/include/asm/highmem.h b/arch/microblaze/include/asm/highmem.h index 66521fdc3a47..eb0a2cb883bd 100644 --- a/arch/microblaze/include/asm/highmem.h +++ b/arch/microblaze/include/asm/highmem.h @@ -51,14 +51,9 @@ extern pte_t *pkmap_page_table; #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) -extern void *kmap_atomic_prot(struct page *page, pgprot_t prot); +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); extern void kunmap_atomic_high(void *kvaddr); -static inline void *kmap_atomic_high(struct page *page) -{ - return kmap_atomic_prot(page, kmap_prot); -} - #define flush_cache_kmaps() { flush_icache(); flush_dcache(); } #endif /* __KERNEL__ */ diff --git a/arch/microblaze/mm/highmem.c b/arch/microblaze/mm/highmem.c index 1026aeffe11a..ee8a422b2b76 100644 --- a/arch/microblaze/mm/highmem.c +++ b/arch/microblaze/mm/highmem.c @@ -32,7 +32,7 @@ */ #include <asm/tlbflush.h> -void *kmap_atomic_prot(struct page *page, pgprot_t prot) +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { unsigned long vaddr; @@ -49,7 +49,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot) return (void *) vaddr; } -EXPORT_SYMBOL(kmap_atomic_prot); +EXPORT_SYMBOL(kmap_atomic_high_prot); void kunmap_atomic_high(void *kvaddr) { diff --git a/arch/mips/include/asm/highmem.h b/arch/mips/include/asm/highmem.h index d9f774bd4938..c9f46b450a68 100644 --- a/arch/mips/include/asm/highmem.h +++ b/arch/mips/include/asm/highmem.h @@ -48,7 +48,7 @@ extern pte_t *pkmap_page_table; #define ARCH_HAS_KMAP_FLUSH_TLB extern void kmap_flush_tlb(unsigned long addr); -extern void *kmap_atomic_high(struct page *page); +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); extern void kunmap_atomic_high(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c index 87023bd1a33c..37e244cdb14e 100644 --- a/arch/mips/mm/highmem.c +++ b/arch/mips/mm/highmem.c @@ -18,7 +18,7 @@ void kmap_flush_tlb(unsigned long addr) } EXPORT_SYMBOL(kmap_flush_tlb); -void *kmap_atomic_high(struct page *page) +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { unsigned long vaddr; int idx, type; @@ -29,12 +29,12 @@ void *kmap_atomic_high(struct page *page) #ifdef CONFIG_DEBUG_HIGHMEM BUG_ON(!pte_none(*(kmap_pte - idx))); #endif - set_pte(kmap_pte-idx, mk_pte(page, kmap_prot)); + set_pte(kmap_pte-idx, mk_pte(page, prot)); local_flush_tlb_one((unsigned long)vaddr); return (void*) vaddr; } -EXPORT_SYMBOL(kmap_atomic_high); +EXPORT_SYMBOL(kmap_atomic_high_prot); void kunmap_atomic_high(void *kvaddr) { diff --git a/arch/nds32/include/asm/highmem.h b/arch/nds32/include/asm/highmem.h index 97648b678108..1f9fc74d112d 100644 --- a/arch/nds32/include/asm/highmem.h +++ b/arch/nds32/include/asm/highmem.h @@ -51,7 +51,7 @@ extern void kmap_init(void); * when CONFIG_HIGHMEM is not set. */ #ifdef CONFIG_HIGHMEM -extern void *kmap_atomic_high(struct page *page); +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); extern void kunmap_atomic_high(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); extern struct page *kmap_atomic_to_page(void *ptr); diff --git a/arch/nds32/mm/highmem.c b/arch/nds32/mm/highmem.c index 809f8c830f06..63ded527c1e8 100644 --- a/arch/nds32/mm/highmem.c +++ b/arch/nds32/mm/highmem.c @@ -10,7 +10,7 @@ #include <asm/fixmap.h> #include <asm/tlbflush.h> -void *kmap_atomic_high(struct page *page) +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { unsigned int idx; unsigned long vaddr, pte; @@ -21,7 +21,7 @@ void *kmap_atomic_high(struct page *page) idx = type + KM_TYPE_NR * smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - pte = (page_to_pfn(page) << PAGE_SHIFT) | (kmap_prot); + pte = (page_to_pfn(page) << PAGE_SHIFT) | prot; ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); set_pte(ptep, pte); @@ -32,7 +32,7 @@ void *kmap_atomic_high(struct page *page) return (void *)vaddr; } -EXPORT_SYMBOL(kmap_atomic_high); +EXPORT_SYMBOL(kmap_atomic_high_prot); void kunmap_atomic_high(void *kvaddr) { diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h index d264aebcaa9b..edd01bbe5a44 100644 --- a/arch/powerpc/include/asm/highmem.h +++ b/arch/powerpc/include/asm/highmem.h @@ -59,15 +59,9 @@ extern pte_t *pkmap_page_table; #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) -extern void *kmap_atomic_prot(struct page *page, pgprot_t prot); +extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); extern void kunmap_atomic_high(void *kvaddr); -static inline void *kmap_atomic_high(struct page *page) -{ - return kmap_atomic_prot(page, kmap_prot); -} - - #define flush_cache_kmaps() flush_cache_all() #endif /* __KERNEL__ */ diff --git a/arch/powerpc/mm/highmem.c b/arch/powerpc/mm/highmem.c index 162958321e28..35071c2913f1 100644 --- a/arch/powerpc/mm/highmem.c +++ b/arch/powerpc/mm/highmem.c @@ -24,7 +24,7 @@ #include <linux/highmem.h> #include <linux/module.h> -void *kmap_atomic_prot(struct page *page, pgprot_t prot) +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { unsigned long vaddr; int idx, type; @@ -38,7 +38,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot) return (void*) vaddr; } -EXPORT_SYMBOL(kmap_atomic_prot); +EXPORT_SYMBOL(kmap_atomic_high_prot); void kunmap_atomic_high(void *kvaddr) { diff --git a/arch/sparc/include/asm/highmem.h b/arch/sparc/include/asm/highmem.h index 94dd6e4c5fa4..d5c5700672de 100644 --- a/arch/sparc/include/asm/highmem.h +++ b/arch/sparc/include/asm/highmem.h @@ -50,7 +50,7 @@ void kmap_init(void) __init; #define PKMAP_END (PKMAP_ADDR(LAST_PKMAP)) -void *kmap_atomic_high(struct page *page); +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); void kunmap_atomic_high(void *kvaddr); #define flush_cache_kmaps() flush_cache_all() diff --git a/arch/sparc/mm/highmem.c b/arch/sparc/mm/highmem.c index 9f06d75e88e1..414f578d1e57 100644 --- a/arch/sparc/mm/highmem.c +++ b/arch/sparc/mm/highmem.c @@ -54,7 +54,7 @@ void __init kmap_init(void) kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE); } -void *kmap_atomic_high(struct page *page) +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { unsigned long vaddr; long idx, type; @@ -73,7 +73,7 @@ void *kmap_atomic_high(struct page *page) #ifdef CONFIG_DEBUG_HIGHMEM BUG_ON(!pte_none(*(kmap_pte-idx))); #endif - set_pte(kmap_pte-idx, mk_pte(page, kmap_prot)); + set_pte(kmap_pte-idx, mk_pte(page, prot)); /* XXX Fix - Anton */ #if 0 __flush_tlb_one(vaddr); @@ -83,7 +83,7 @@ void *kmap_atomic_high(struct page *page) return (void*) vaddr; } -EXPORT_SYMBOL(kmap_atomic_high); +EXPORT_SYMBOL(kmap_atomic_high_prot); void kunmap_atomic_high(void *kvaddr) { diff --git a/arch/x86/include/asm/highmem.h b/arch/x86/include/asm/highmem.h index ff87aba96eee..009b8e22e906 100644 --- a/arch/x86/include/asm/highmem.h +++ b/arch/x86/include/asm/highmem.h @@ -58,11 +58,7 @@ extern unsigned long highstart_pfn, highend_pfn; #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) -extern void *kmap_atomic_prot(struct page *page, pgprot_t prot); -void *kmap_atomic_high(struct page *page) -{ - return kmap_atomic_prot(page, kmap_prot); -} +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); void kunmap_atomic_high(void *kvaddr); void *kmap_atomic_pfn(unsigned long pfn); void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot); diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c index af07a6842743..075fe51317b0 100644 --- a/arch/x86/mm/highmem_32.c +++ b/arch/x86/mm/highmem_32.c @@ -4,7 +4,7 @@ #include <linux/swap.h> /* for totalram_pages */ #include <linux/memblock.h> -void *kmap_atomic_prot(struct page *page, pgprot_t prot) +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { unsigned long vaddr; int idx, type; @@ -18,7 +18,7 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot) return (void *)vaddr; } -EXPORT_SYMBOL(kmap_atomic_prot); +EXPORT_SYMBOL(kmap_atomic_high_prot); /* * This is the same as kmap_atomic() but can map memory that doesn't diff --git a/arch/xtensa/include/asm/highmem.h b/arch/xtensa/include/asm/highmem.h index a60a02dc68f6..7152aeb1e3a4 100644 --- a/arch/xtensa/include/asm/highmem.h +++ b/arch/xtensa/include/asm/highmem.h @@ -68,7 +68,7 @@ static inline void flush_cache_kmaps(void) flush_cache_all(); } -void *kmap_atomic_high(struct page *page); +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot); void kunmap_atomic_high(void *kvaddr); void kmap_init(void); diff --git a/arch/xtensa/mm/highmem.c b/arch/xtensa/mm/highmem.c index 8c58c4c37033..fe56644d7b23 100644 --- a/arch/xtensa/mm/highmem.c +++ b/arch/xtensa/mm/highmem.c @@ -37,7 +37,7 @@ static inline enum fixed_addresses kmap_idx(int type, unsigned long color) color; } -void *kmap_atomic_high(struct page *page) +void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { enum fixed_addresses idx; unsigned long vaddr; @@ -48,11 +48,11 @@ void *kmap_atomic_high(struct page *page) #ifdef CONFIG_DEBUG_HIGHMEM BUG_ON(!pte_none(*(kmap_pte + idx))); #endif - set_pte(kmap_pte + idx, mk_pte(page, kmap_prot)); + set_pte(kmap_pte + idx, mk_pte(page, prot)); return (void *)vaddr; } -EXPORT_SYMBOL(kmap_atomic_high); +EXPORT_SYMBOL(kmap_atomic_high_prot); void kunmap_atomic_high(void *kvaddr) { diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 601df07607a4..b10e8a39ae60 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -74,14 +74,15 @@ static inline void kunmap(struct page *page) * be used in IRQ contexts, so in some (very limited) cases we need * it. */ -static inline void *kmap_atomic(struct page *page) +static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot) { preempt_disable(); pagefault_disable(); if (!PageHighMem(page)) return page_address(page); - return kmap_atomic_high(page); + return kmap_atomic_high_prot(page, prot); } +#define kmap_atomic(page) kmap_atomic_prot(page, kmap_prot) /* declarations for linux/mm/highmem.c */ unsigned int nr_free_highpages(void);