| Message ID | 20220624044339.1533882-8-anshuman.khandual@arm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | mm/mmap: Drop __SXXX/__PXXX macros from across platforms | expand |
Le 24/06/2022 à 06:43, Anshuman Khandual a écrit : > protection_map[] has already been moved inside those platforms which enable Usually "already" means before your series. Your series is the one that moves protection_map[] so I would have just said "Now that protection_map[] has been moved inside those platforms which enable ...." > ARCH_HAS_VM_GET_PAGE_PROT. Hence generic protection_map[] array now can be > protected with CONFIG_ARCH_HAS_VM_GET_PAGE_PROT intead of __P000. > > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > --- > include/linux/mm.h | 2 +- > mm/mmap.c | 5 +---- > 2 files changed, 2 insertions(+), 5 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 237828c2bae2..70d900f6df43 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -424,7 +424,7 @@ extern unsigned int kobjsize(const void *objp); > * mapping from the currently active vm_flags protection bits (the > * low four bits) to a page protection mask.. > */ > -#ifdef __P000 > +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT > extern pgprot_t protection_map[16]; Is this declaration still needed ? I have the feeling that protection_map[] is only used in mm/mmap.c now. > #endif > > diff --git a/mm/mmap.c b/mm/mmap.c > index 55c30aee3999..43db3bd49071 100644 > --- a/mm/mmap.c > +++ b/mm/mmap.c > @@ -101,7 +101,7 @@ static void unmap_region(struct mm_struct *mm, > * w: (no) no > * x: (yes) yes > */ > -#ifdef __P000 > +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT > pgprot_t protection_map[16] __ro_after_init = { Should this be static, as it seems to now be used only in this file ? And it could also be 'const' instead of __ro_after_init. > [VM_NONE] = __P000, > [VM_READ] = __P001, > @@ -120,9 +120,6 @@ pgprot_t protection_map[16] __ro_after_init = { > [VM_SHARED | VM_EXEC | VM_WRITE] = __S110, > [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __S111 > }; > -#endif > - > -#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT > DECLARE_VM_GET_PAGE_PROT > #endif /* CONFIG_ARCH_HAS_VM_GET_PAGE_PROT */ >
On 6/24/22 10:52, Christophe Leroy wrote: > > > Le 24/06/2022 à 06:43, Anshuman Khandual a écrit : >> protection_map[] has already been moved inside those platforms which enable > > Usually "already" means before your series. > > Your series is the one that moves protection_map[] so I would have just > said "Now that protection_map[] has been moved inside those platforms > which enable ...." Got it, will update the commit message. > >> ARCH_HAS_VM_GET_PAGE_PROT. Hence generic protection_map[] array now can be >> protected with CONFIG_ARCH_HAS_VM_GET_PAGE_PROT intead of __P000. >> >> Cc: Andrew Morton <akpm@linux-foundation.org> >> Cc: linux-mm@kvack.org >> Cc: linux-kernel@vger.kernel.org >> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> >> --- >> include/linux/mm.h | 2 +- >> mm/mmap.c | 5 +---- >> 2 files changed, 2 insertions(+), 5 deletions(-) >> >> diff --git a/include/linux/mm.h b/include/linux/mm.h >> index 237828c2bae2..70d900f6df43 100644 >> --- a/include/linux/mm.h >> +++ b/include/linux/mm.h >> @@ -424,7 +424,7 @@ extern unsigned int kobjsize(const void *objp); >> * mapping from the currently active vm_flags protection bits (the >> * low four bits) to a page protection mask.. >> */ >> -#ifdef __P000 >> +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT >> extern pgprot_t protection_map[16]; > > Is this declaration still needed ? I have the feeling that > protection_map[] is only used in mm/mmap.c now. At this point generic protection_map[] array is still being used via this declaration on many (!ARCH_HAS_VM_GET_PAGE_PROT) platforms such as mips, m68k, arm etc. > >> #endif >> >> diff --git a/mm/mmap.c b/mm/mmap.c >> index 55c30aee3999..43db3bd49071 100644 >> --- a/mm/mmap.c >> +++ b/mm/mmap.c >> @@ -101,7 +101,7 @@ static void unmap_region(struct mm_struct *mm, >> * w: (no) no >> * x: (yes) yes >> */ >> -#ifdef __P000 >> +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT >> pgprot_t protection_map[16] __ro_after_init = { > > Should this be static, as it seems to now be used only in this file ? This is being used in some platforms as mentioned before. > And it could also be 'const' instead of __ro_after_init. Then should be able to be a 'const' wrt mips, m68k, arm platforms. But should this even be changed, if this is going to be dropped off eventually ? > >> [VM_NONE] = __P000, >> [VM_READ] = __P001, >> @@ -120,9 +120,6 @@ pgprot_t protection_map[16] __ro_after_init = { >> [VM_SHARED | VM_EXEC | VM_WRITE] = __S110, >> [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __S111 >> }; >> -#endif >> - >> -#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT >> DECLARE_VM_GET_PAGE_PROT >> #endif /* CONFIG_ARCH_HAS_VM_GET_PAGE_PROT */ >>
Le 24/06/2022 à 06:43, Anshuman Khandual a écrit : > protection_map[] has already been moved inside those platforms which enable > ARCH_HAS_VM_GET_PAGE_PROT. Hence generic protection_map[] array now can be > protected with CONFIG_ARCH_HAS_VM_GET_PAGE_PROT intead of __P000. > > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: linux-mm@kvack.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu> > --- > include/linux/mm.h | 2 +- > mm/mmap.c | 5 +---- > 2 files changed, 2 insertions(+), 5 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 237828c2bae2..70d900f6df43 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -424,7 +424,7 @@ extern unsigned int kobjsize(const void *objp); > * mapping from the currently active vm_flags protection bits (the > * low four bits) to a page protection mask.. > */ > -#ifdef __P000 > +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT > extern pgprot_t protection_map[16]; > #endif > > diff --git a/mm/mmap.c b/mm/mmap.c > index 55c30aee3999..43db3bd49071 100644 > --- a/mm/mmap.c > +++ b/mm/mmap.c > @@ -101,7 +101,7 @@ static void unmap_region(struct mm_struct *mm, > * w: (no) no > * x: (yes) yes > */ > -#ifdef __P000 > +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT > pgprot_t protection_map[16] __ro_after_init = { > [VM_NONE] = __P000, > [VM_READ] = __P001, > @@ -120,9 +120,6 @@ pgprot_t protection_map[16] __ro_after_init = { > [VM_SHARED | VM_EXEC | VM_WRITE] = __S110, > [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __S111 > }; > -#endif > - > -#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT > DECLARE_VM_GET_PAGE_PROT > #endif /* CONFIG_ARCH_HAS_VM_GET_PAGE_PROT */ >
diff --git a/include/linux/mm.h b/include/linux/mm.h index 237828c2bae2..70d900f6df43 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -424,7 +424,7 @@ extern unsigned int kobjsize(const void *objp); * mapping from the currently active vm_flags protection bits (the * low four bits) to a page protection mask.. */ -#ifdef __P000 +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT extern pgprot_t protection_map[16]; #endif diff --git a/mm/mmap.c b/mm/mmap.c index 55c30aee3999..43db3bd49071 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -101,7 +101,7 @@ static void unmap_region(struct mm_struct *mm, * w: (no) no * x: (yes) yes */ -#ifdef __P000 +#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT pgprot_t protection_map[16] __ro_after_init = { [VM_NONE] = __P000, [VM_READ] = __P001, @@ -120,9 +120,6 @@ pgprot_t protection_map[16] __ro_after_init = { [VM_SHARED | VM_EXEC | VM_WRITE] = __S110, [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __S111 }; -#endif - -#ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT DECLARE_VM_GET_PAGE_PROT #endif /* CONFIG_ARCH_HAS_VM_GET_PAGE_PROT */
protection_map[] has already been moved inside those platforms which enable ARCH_HAS_VM_GET_PAGE_PROT. Hence generic protection_map[] array now can be protected with CONFIG_ARCH_HAS_VM_GET_PAGE_PROT intead of __P000. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> --- include/linux/mm.h | 2 +- mm/mmap.c | 5 +---- 2 files changed, 2 insertions(+), 5 deletions(-)