| Message ID | 1643860669-26307-1-git-send-email-anshuman.khandual@arm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [V2] mm: Merge pte_mkhuge() call into arch_make_huge_pte() | expand |
On Thu, Feb 03, 2022 at 09:27:49AM +0530, Anshuman Khandual wrote: > Each call into pte_mkhuge() is invariably followed by arch_make_huge_pte(). > Instead arch_make_huge_pte() can accommodate pte_mkhuge() at the beginning. > This updates generic fallback stub for arch_make_huge_pte() and available > platforms definitions. This makes huge pte creation much cleaner and easier > to follow. > > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Will Deacon <will@kernel.org> > Cc: Michael Ellerman <mpe@ellerman.id.au> > Cc: Paul Mackerras <paulus@samba.org> > Cc: "David S. Miller" <davem@davemloft.net> > Cc: Mike Kravetz <mike.kravetz@oracle.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: linux-arm-kernel@lists.infradead.org > Cc: linuxppc-dev@lists.ozlabs.org > Cc: sparclinux@vger.kernel.org > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.kernel.org > Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu> > Acked-by: Mike Kravetz <mike.kravetz@oracle.com> > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Acking v2 as well: Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Hi, Le 03/02/2022 à 04:57, Anshuman Khandual a écrit : > Each call into pte_mkhuge() is invariably followed by arch_make_huge_pte(). > Instead arch_make_huge_pte() can accommodate pte_mkhuge() at the beginning. > This updates generic fallback stub for arch_make_huge_pte() and available > platforms definitions. This makes huge pte creation much cleaner and easier > to follow. I can't remember, what was the reason for not doing it in remove_migration_pte() as well ? Looking at it, I have the feeling that we now have a redundant pte_mkhuge() there. Also, could we get rid of the one in mm/debug_vm_pgtable.c ? Also, shouldn't arch_make_huge_pte() be documented in Documentation/vm/arch_pgtable_helpers.rst instead of pte_mkhuge() ? Christophe > > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Will Deacon <will@kernel.org> > Cc: Michael Ellerman <mpe@ellerman.id.au> > Cc: Paul Mackerras <paulus@samba.org> > Cc: "David S. Miller" <davem@davemloft.net> > Cc: Mike Kravetz <mike.kravetz@oracle.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: linux-arm-kernel@lists.infradead.org > Cc: linuxppc-dev@lists.ozlabs.org > Cc: sparclinux@vger.kernel.org > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.kernel.org > Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu> > Acked-by: Mike Kravetz <mike.kravetz@oracle.com> > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > --- > This applies on v5.17-rc2 > > Changes in V2: > > - Direct PTE encode in arch_make_huge_pte() on powerpc platform per Christophe > > Changes in V1: > > https://lore.kernel.org/all/1643780286-18798-1-git-send-email-anshuman.khandual@arm.com/ > > arch/arm64/mm/hugetlbpage.c | 1 + > arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h | 4 ++-- > arch/sparc/mm/hugetlbpage.c | 1 + > include/linux/hugetlb.h | 2 +- > mm/hugetlb.c | 3 +-- > mm/vmalloc.c | 1 - > 6 files changed, 6 insertions(+), 6 deletions(-) > > diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c > index ffb9c229610a..228226c5fa80 100644 > --- a/arch/arm64/mm/hugetlbpage.c > +++ b/arch/arm64/mm/hugetlbpage.c > @@ -347,6 +347,7 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags) > { > size_t pagesize = 1UL << shift; > > + entry = pte_mkhuge(entry); > if (pagesize == CONT_PTE_SIZE) { > entry = pte_mkcont(entry); > } else if (pagesize == CONT_PMD_SIZE) { > diff --git a/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h b/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h > index 64b6c608eca4..de092b04ee1a 100644 > --- a/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h > +++ b/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h > @@ -71,9 +71,9 @@ static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags > size_t size = 1UL << shift; > > if (size == SZ_16K) > - return __pte(pte_val(entry) & ~_PAGE_HUGE); > + return __pte(pte_val(entry) | _PAGE_SPS); > else > - return entry; > + return __pte(pte_val(entry) | _PAGE_SPS | _PAGE_HUGE); > } > #define arch_make_huge_pte arch_make_huge_pte > #endif > diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c > index 0f49fada2093..d8e0e3c7038d 100644 > --- a/arch/sparc/mm/hugetlbpage.c > +++ b/arch/sparc/mm/hugetlbpage.c > @@ -181,6 +181,7 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags) > { > pte_t pte; > > + entry = pte_mkhuge(entry); > pte = hugepage_shift_to_tte(entry, shift); > > #ifdef CONFIG_SPARC64 > diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h > index d1897a69c540..52c462390aee 100644 > --- a/include/linux/hugetlb.h > +++ b/include/linux/hugetlb.h > @@ -754,7 +754,7 @@ static inline void arch_clear_hugepage_flags(struct page *page) { } > static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, > vm_flags_t flags) > { > - return entry; > + return pte_mkhuge(entry); > } > #endif > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index 61895cc01d09..5ca253c1b4e4 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -4637,7 +4637,6 @@ static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, > vma->vm_page_prot)); > } > entry = pte_mkyoung(entry); > - entry = pte_mkhuge(entry); > entry = arch_make_huge_pte(entry, shift, vma->vm_flags); > > return entry; > @@ -6172,7 +6171,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, > unsigned int shift = huge_page_shift(hstate_vma(vma)); > > old_pte = huge_ptep_modify_prot_start(vma, address, ptep); > - pte = pte_mkhuge(huge_pte_modify(old_pte, newprot)); > + pte = huge_pte_modify(old_pte, newprot); > pte = arch_make_huge_pte(pte, shift, vma->vm_flags); > huge_ptep_modify_prot_commit(vma, address, ptep, old_pte, pte); > pages++; > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > index 4165304d3547..d0b14dd73adc 100644 > --- a/mm/vmalloc.c > +++ b/mm/vmalloc.c > @@ -118,7 +118,6 @@ static int vmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, > if (size != PAGE_SIZE) { > pte_t entry = pfn_pte(pfn, prot); > > - entry = pte_mkhuge(entry); > entry = arch_make_huge_pte(entry, ilog2(size), 0); > set_huge_pte_at(&init_mm, addr, pte, entry); > pfn += PFN_DOWN(size);
On 3/1/23 12:26, Christophe Leroy wrote: > Hi, > > Le 03/02/2022 à 04:57, Anshuman Khandual a écrit : >> Each call into pte_mkhuge() is invariably followed by arch_make_huge_pte(). >> Instead arch_make_huge_pte() can accommodate pte_mkhuge() at the beginning. >> This updates generic fallback stub for arch_make_huge_pte() and available >> platforms definitions. This makes huge pte creation much cleaner and easier >> to follow. > > I can't remember, what was the reason for not doing it in > remove_migration_pte() as well ? > Looking at it, I have the feeling that we now have a redundant > pte_mkhuge() there. I guess it just got missed out, but you are right, there seems to be a redundant pte_mkhuge() in remove_migration_pte(), I will send out a patch dropping it off. > > Also, could we get rid of the one in mm/debug_vm_pgtable.c ? After this patch, arch_make_huge_pte() should be used instead in generic MM for all cases. So you are suggesting arch_make_huge_pte() should be tested instead ? diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index c631ade3f1d2..15ee86034ddc 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -909,7 +909,7 @@ static void __init hugetlb_basic_tests(struct pgtable_debug_args *args) #ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB pte = pfn_pte(args->fixed_pmd_pfn, args->page_prot); - WARN_ON(!pte_huge(pte_mkhuge(pte))); + WARN_ON(!pte_huge(arch_make_huge_pte(pte))); #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ } #else /* !CONFIG_HUGETLB_PAGE */ > > Also, shouldn't arch_make_huge_pte() be documented in > Documentation/vm/arch_pgtable_helpers.rst instead of pte_mkhuge() ? diff --git a/Documentation/mm/arch_pgtable_helpers.rst b/Documentation/mm/arch_pgtable_helpers.rst index fd2a19df884e..07a0618f84de 100644 --- a/Documentation/mm/arch_pgtable_helpers.rst +++ b/Documentation/mm/arch_pgtable_helpers.rst @@ -216,7 +216,7 @@ HugeTLB Page Table Helpers +---------------------------+--------------------------------------------------+ | pte_huge | Tests a HugeTLB | +---------------------------+--------------------------------------------------+ -| pte_mkhuge | Creates a HugeTLB | +| arch_make_huge_pte | Creates a HugeTLB | +---------------------------+--------------------------------------------------+ | huge_pte_dirty | Tests a dirty HugeTLB | +---------------------------+--------------------------------------------------+ I will send out a patch implementing the above changes. I guess pte_mkhuge() now will just be a platform helper, which can be folded into arch_make_huge_pte() if and when required. - Anshuman > > Christophe > >> >> Cc: Catalin Marinas <catalin.marinas@arm.com> >> Cc: Will Deacon <will@kernel.org> >> Cc: Michael Ellerman <mpe@ellerman.id.au> >> Cc: Paul Mackerras <paulus@samba.org> >> Cc: "David S. Miller" <davem@davemloft.net> >> Cc: Mike Kravetz <mike.kravetz@oracle.com> >> Cc: Andrew Morton <akpm@linux-foundation.org> >> Cc: linux-arm-kernel@lists.infradead.org >> Cc: linuxppc-dev@lists.ozlabs.org >> Cc: sparclinux@vger.kernel.org >> Cc: linux-mm@kvack.org >> Cc: linux-kernel@vger.kernel.org >> Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu> >> Acked-by: Mike Kravetz <mike.kravetz@oracle.com> >> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> >> --- >> This applies on v5.17-rc2 >> >> Changes in V2: >> >> - Direct PTE encode in arch_make_huge_pte() on powerpc platform per Christophe >> >> Changes in V1: >> >> https://lore.kernel.org/all/1643780286-18798-1-git-send-email-anshuman.khandual@arm.com/ >> >> arch/arm64/mm/hugetlbpage.c | 1 + >> arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h | 4 ++-- >> arch/sparc/mm/hugetlbpage.c | 1 + >> include/linux/hugetlb.h | 2 +- >> mm/hugetlb.c | 3 +-- >> mm/vmalloc.c | 1 - >> 6 files changed, 6 insertions(+), 6 deletions(-) >> >> diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c >> index ffb9c229610a..228226c5fa80 100644 >> --- a/arch/arm64/mm/hugetlbpage.c >> +++ b/arch/arm64/mm/hugetlbpage.c >> @@ -347,6 +347,7 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags) >> { >> size_t pagesize = 1UL << shift; >> >> + entry = pte_mkhuge(entry); >> if (pagesize == CONT_PTE_SIZE) { >> entry = pte_mkcont(entry); >> } else if (pagesize == CONT_PMD_SIZE) { >> diff --git a/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h b/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h >> index 64b6c608eca4..de092b04ee1a 100644 >> --- a/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h >> +++ b/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h >> @@ -71,9 +71,9 @@ static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags >> size_t size = 1UL << shift; >> >> if (size == SZ_16K) >> - return __pte(pte_val(entry) & ~_PAGE_HUGE); >> + return __pte(pte_val(entry) | _PAGE_SPS); >> else >> - return entry; >> + return __pte(pte_val(entry) | _PAGE_SPS | _PAGE_HUGE); >> } >> #define arch_make_huge_pte arch_make_huge_pte >> #endif >> diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c >> index 0f49fada2093..d8e0e3c7038d 100644 >> --- a/arch/sparc/mm/hugetlbpage.c >> +++ b/arch/sparc/mm/hugetlbpage.c >> @@ -181,6 +181,7 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags) >> { >> pte_t pte; >> >> + entry = pte_mkhuge(entry); >> pte = hugepage_shift_to_tte(entry, shift); >> >> #ifdef CONFIG_SPARC64 >> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h >> index d1897a69c540..52c462390aee 100644 >> --- a/include/linux/hugetlb.h >> +++ b/include/linux/hugetlb.h >> @@ -754,7 +754,7 @@ static inline void arch_clear_hugepage_flags(struct page *page) { } >> static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, >> vm_flags_t flags) >> { >> - return entry; >> + return pte_mkhuge(entry); >> } >> #endif >> >> diff --git a/mm/hugetlb.c b/mm/hugetlb.c >> index 61895cc01d09..5ca253c1b4e4 100644 >> --- a/mm/hugetlb.c >> +++ b/mm/hugetlb.c >> @@ -4637,7 +4637,6 @@ static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, >> vma->vm_page_prot)); >> } >> entry = pte_mkyoung(entry); >> - entry = pte_mkhuge(entry); >> entry = arch_make_huge_pte(entry, shift, vma->vm_flags); >> >> return entry; >> @@ -6172,7 +6171,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, >> unsigned int shift = huge_page_shift(hstate_vma(vma)); >> >> old_pte = huge_ptep_modify_prot_start(vma, address, ptep); >> - pte = pte_mkhuge(huge_pte_modify(old_pte, newprot)); >> + pte = huge_pte_modify(old_pte, newprot); >> pte = arch_make_huge_pte(pte, shift, vma->vm_flags); >> huge_ptep_modify_prot_commit(vma, address, ptep, old_pte, pte); >> pages++; >> diff --git a/mm/vmalloc.c b/mm/vmalloc.c >> index 4165304d3547..d0b14dd73adc 100644 >> --- a/mm/vmalloc.c >> +++ b/mm/vmalloc.c >> @@ -118,7 +118,6 @@ static int vmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, >> if (size != PAGE_SIZE) { >> pte_t entry = pfn_pte(pfn, prot); >> >> - entry = pte_mkhuge(entry); >> entry = arch_make_huge_pte(entry, ilog2(size), 0); >> set_huge_pte_at(&init_mm, addr, pte, entry); >> pfn += PFN_DOWN(size);
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index ffb9c229610a..228226c5fa80 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -347,6 +347,7 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags) { size_t pagesize = 1UL << shift; + entry = pte_mkhuge(entry); if (pagesize == CONT_PTE_SIZE) { entry = pte_mkcont(entry); } else if (pagesize == CONT_PMD_SIZE) { diff --git a/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h b/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h index 64b6c608eca4..de092b04ee1a 100644 --- a/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h +++ b/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h @@ -71,9 +71,9 @@ static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags size_t size = 1UL << shift; if (size == SZ_16K) - return __pte(pte_val(entry) & ~_PAGE_HUGE); + return __pte(pte_val(entry) | _PAGE_SPS); else - return entry; + return __pte(pte_val(entry) | _PAGE_SPS | _PAGE_HUGE); } #define arch_make_huge_pte arch_make_huge_pte #endif diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c index 0f49fada2093..d8e0e3c7038d 100644 --- a/arch/sparc/mm/hugetlbpage.c +++ b/arch/sparc/mm/hugetlbpage.c @@ -181,6 +181,7 @@ pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags) { pte_t pte; + entry = pte_mkhuge(entry); pte = hugepage_shift_to_tte(entry, shift); #ifdef CONFIG_SPARC64 diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index d1897a69c540..52c462390aee 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -754,7 +754,7 @@ static inline void arch_clear_hugepage_flags(struct page *page) { } static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags) { - return entry; + return pte_mkhuge(entry); } #endif diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 61895cc01d09..5ca253c1b4e4 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -4637,7 +4637,6 @@ static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page, vma->vm_page_prot)); } entry = pte_mkyoung(entry); - entry = pte_mkhuge(entry); entry = arch_make_huge_pte(entry, shift, vma->vm_flags); return entry; @@ -6172,7 +6171,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, unsigned int shift = huge_page_shift(hstate_vma(vma)); old_pte = huge_ptep_modify_prot_start(vma, address, ptep); - pte = pte_mkhuge(huge_pte_modify(old_pte, newprot)); + pte = huge_pte_modify(old_pte, newprot); pte = arch_make_huge_pte(pte, shift, vma->vm_flags); huge_ptep_modify_prot_commit(vma, address, ptep, old_pte, pte); pages++; diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 4165304d3547..d0b14dd73adc 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -118,7 +118,6 @@ static int vmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, if (size != PAGE_SIZE) { pte_t entry = pfn_pte(pfn, prot); - entry = pte_mkhuge(entry); entry = arch_make_huge_pte(entry, ilog2(size), 0); set_huge_pte_at(&init_mm, addr, pte, entry); pfn += PFN_DOWN(size);