Re: [PATCH] mm: Define ARCH_HAS_FIRST_USER_ADDRESS
On 4/14/21 11:40 AM, Christophe Leroy wrote: > > > Le 14/04/2021 à 07:59, Anshuman Khandual a écrit : >> >> >> On 4/14/21 10:52 AM, Christophe Leroy wrote: >>> >>> >>> Le 14/04/2021 à 04:54, Anshuman Khandual a écrit : Currently most platforms define FIRST_USER_ADDRESS as 0UL duplicating the same code all over. Instead define a new option ARCH_HAS_FIRST_USER_ADDRESS for those platforms which would override generic default FIRST_USER_ADDRESS value 0UL. This makes it much cleaner with reduced code. Cc: linux-al...@vger.kernel.org Cc: linux-snps-arc@lists.infradead.org Cc: linux-arm-ker...@lists.infradead.org Cc: linux-c...@vger.kernel.org Cc: linux-hexa...@vger.kernel.org Cc: linux-i...@vger.kernel.org Cc: linux-m...@lists.linux-m68k.org Cc: linux-m...@vger.kernel.org Cc: openr...@lists.librecores.org Cc: linux-par...@vger.kernel.org Cc: linuxppc-...@lists.ozlabs.org Cc: linux-ri...@lists.infradead.org Cc: linux-s...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: sparcli...@vger.kernel.org Cc: linux...@lists.infradead.org Cc: linux-xte...@linux-xtensa.org Cc: x...@kernel.org Cc: linux...@kvack.org Cc: linux-ker...@vger.kernel.org Signed-off-by: Anshuman Khandual --- arch/alpha/include/asm/pgtable.h | 1 - arch/arc/include/asm/pgtable.h | 6 -- arch/arm/Kconfig | 1 + arch/arm64/include/asm/pgtable.h | 2 -- arch/csky/include/asm/pgtable.h | 1 - arch/hexagon/include/asm/pgtable.h | 3 --- arch/ia64/include/asm/pgtable.h | 1 - arch/m68k/include/asm/pgtable_mm.h | 1 - arch/microblaze/include/asm/pgtable.h | 2 -- arch/mips/include/asm/pgtable-32.h | 1 - arch/mips/include/asm/pgtable-64.h | 1 - arch/nds32/Kconfig | 1 + arch/nios2/include/asm/pgtable.h | 2 -- arch/openrisc/include/asm/pgtable.h | 1 - arch/parisc/include/asm/pgtable.h | 2 -- arch/powerpc/include/asm/book3s/pgtable.h | 1 - arch/powerpc/include/asm/nohash/32/pgtable.h | 1 - arch/powerpc/include/asm/nohash/64/pgtable.h | 2 -- arch/riscv/include/asm/pgtable.h | 2 -- arch/s390/include/asm/pgtable.h | 2 -- arch/sh/include/asm/pgtable.h | 2 -- arch/sparc/include/asm/pgtable_32.h | 1 - arch/sparc/include/asm/pgtable_64.h | 3 --- arch/um/include/asm/pgtable-2level.h | 1 - arch/um/include/asm/pgtable-3level.h | 1 - arch/x86/include/asm/pgtable_types.h | 2 -- arch/xtensa/include/asm/pgtable.h | 1 - include/linux/mm.h | 4 mm/Kconfig | 4 29 files changed, 10 insertions(+), 43 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 8ba434287387..47098ccd715e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -46,6 +46,10 @@ extern int sysctl_page_lock_unfairness; void init_mm_internals(void); +#ifndef ARCH_HAS_FIRST_USER_ADDRESS >>> >>> I guess you didn't test it . :) >> >> In fact I did :) Though just booted it on arm64 and cross compiled on >> multiple others platforms. I guess for all platforms, ARCH_HAS_FIRST_USER_ADDRESS would have just evaluated to be false hence falling back on the generic definition. So this never complained during build any where or during boot on arm64. >> >>> >>> should be #ifndef CONFIG_ARCH_HAS_FIRST_USER_ADDRESS >> >> Right, meant that instead. >> >>> +#define FIRST_USER_ADDRESS 0UL +#endif >>> >>> But why do we need a config option at all for that ? >>> >>> Why not just: >>> >>> #ifndef FIRST_USER_ADDRESS >>> #define FIRST_USER_ADDRESS 0UL >>> #endif >> >> This sounds simpler. But just wondering, would not there be any possibility >> of build problems due to compilation sequence between arch and generic code ? >> > > For sure it has to be addresses carefully, but there are already a lot of > stuff like that around pgtables.h > > For instance, pte_offset_kernel() has a generic definition in > linux/pgtables.h based on whether it is already defined or not. > > Taking into account that FIRST_USER_ADDRESS is today in the architectures's > asm/pgtables.h, I think putting the fallback definition in linux/pgtable.h > would do the trick. Agreed, includes at the beginning and if the arch defines FIRST_USER_ADDRESS, the generic one afterwards would be skipped. The following change builds on multiple platforms. diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index ad086e6d7155..5da96f5df48f 100644 ---
Re: [PATCH] mm: Define ARCH_HAS_FIRST_USER_ADDRESS
Le 14/04/2021 à 07:59, Anshuman Khandual a écrit : On 4/14/21 10:52 AM, Christophe Leroy wrote: Le 14/04/2021 à 04:54, Anshuman Khandual a écrit : Currently most platforms define FIRST_USER_ADDRESS as 0UL duplicating the same code all over. Instead define a new option ARCH_HAS_FIRST_USER_ADDRESS for those platforms which would override generic default FIRST_USER_ADDRESS value 0UL. This makes it much cleaner with reduced code. Cc: linux-al...@vger.kernel.org Cc: linux-snps-arc@lists.infradead.org Cc: linux-arm-ker...@lists.infradead.org Cc: linux-c...@vger.kernel.org Cc: linux-hexa...@vger.kernel.org Cc: linux-i...@vger.kernel.org Cc: linux-m...@lists.linux-m68k.org Cc: linux-m...@vger.kernel.org Cc: openr...@lists.librecores.org Cc: linux-par...@vger.kernel.org Cc: linuxppc-...@lists.ozlabs.org Cc: linux-ri...@lists.infradead.org Cc: linux-s...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: sparcli...@vger.kernel.org Cc: linux...@lists.infradead.org Cc: linux-xte...@linux-xtensa.org Cc: x...@kernel.org Cc: linux...@kvack.org Cc: linux-ker...@vger.kernel.org Signed-off-by: Anshuman Khandual --- arch/alpha/include/asm/pgtable.h | 1 - arch/arc/include/asm/pgtable.h | 6 -- arch/arm/Kconfig | 1 + arch/arm64/include/asm/pgtable.h | 2 -- arch/csky/include/asm/pgtable.h | 1 - arch/hexagon/include/asm/pgtable.h | 3 --- arch/ia64/include/asm/pgtable.h | 1 - arch/m68k/include/asm/pgtable_mm.h | 1 - arch/microblaze/include/asm/pgtable.h | 2 -- arch/mips/include/asm/pgtable-32.h | 1 - arch/mips/include/asm/pgtable-64.h | 1 - arch/nds32/Kconfig | 1 + arch/nios2/include/asm/pgtable.h | 2 -- arch/openrisc/include/asm/pgtable.h | 1 - arch/parisc/include/asm/pgtable.h | 2 -- arch/powerpc/include/asm/book3s/pgtable.h | 1 - arch/powerpc/include/asm/nohash/32/pgtable.h | 1 - arch/powerpc/include/asm/nohash/64/pgtable.h | 2 -- arch/riscv/include/asm/pgtable.h | 2 -- arch/s390/include/asm/pgtable.h | 2 -- arch/sh/include/asm/pgtable.h | 2 -- arch/sparc/include/asm/pgtable_32.h | 1 - arch/sparc/include/asm/pgtable_64.h | 3 --- arch/um/include/asm/pgtable-2level.h | 1 - arch/um/include/asm/pgtable-3level.h | 1 - arch/x86/include/asm/pgtable_types.h | 2 -- arch/xtensa/include/asm/pgtable.h | 1 - include/linux/mm.h | 4 mm/Kconfig | 4 29 files changed, 10 insertions(+), 43 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 8ba434287387..47098ccd715e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -46,6 +46,10 @@ extern int sysctl_page_lock_unfairness; void init_mm_internals(void); +#ifndef ARCH_HAS_FIRST_USER_ADDRESS I guess you didn't test it . :) In fact I did :) Though just booted it on arm64 and cross compiled on multiple others platforms. should be #ifndef CONFIG_ARCH_HAS_FIRST_USER_ADDRESS Right, meant that instead. +#define FIRST_USER_ADDRESS 0UL +#endif But why do we need a config option at all for that ? Why not just: #ifndef FIRST_USER_ADDRESS #define FIRST_USER_ADDRESS 0UL #endif This sounds simpler. But just wondering, would not there be any possibility of build problems due to compilation sequence between arch and generic code ? For sure it has to be addresses carefully, but there are already a lot of stuff like that around pgtables.h For instance, pte_offset_kernel() has a generic definition in linux/pgtables.h based on whether it is already defined or not. Taking into account that FIRST_USER_ADDRESS is today in the architectures's asm/pgtables.h, I think putting the fallback definition in linux/pgtable.h would do the trick. ___ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
Re: [PATCH] mm: Define ARCH_HAS_FIRST_USER_ADDRESS
On 4/14/21 10:52 AM, Christophe Leroy wrote: > > > Le 14/04/2021 à 04:54, Anshuman Khandual a écrit : >> Currently most platforms define FIRST_USER_ADDRESS as 0UL duplicating the >> same code all over. Instead define a new option ARCH_HAS_FIRST_USER_ADDRESS >> for those platforms which would override generic default FIRST_USER_ADDRESS >> value 0UL. This makes it much cleaner with reduced code. >> >> Cc: linux-al...@vger.kernel.org >> Cc: linux-snps-arc@lists.infradead.org >> Cc: linux-arm-ker...@lists.infradead.org >> Cc: linux-c...@vger.kernel.org >> Cc: linux-hexa...@vger.kernel.org >> Cc: linux-i...@vger.kernel.org >> Cc: linux-m...@lists.linux-m68k.org >> Cc: linux-m...@vger.kernel.org >> Cc: openr...@lists.librecores.org >> Cc: linux-par...@vger.kernel.org >> Cc: linuxppc-...@lists.ozlabs.org >> Cc: linux-ri...@lists.infradead.org >> Cc: linux-s...@vger.kernel.org >> Cc: linux...@vger.kernel.org >> Cc: sparcli...@vger.kernel.org >> Cc: linux...@lists.infradead.org >> Cc: linux-xte...@linux-xtensa.org >> Cc: x...@kernel.org >> Cc: linux...@kvack.org >> Cc: linux-ker...@vger.kernel.org >> Signed-off-by: Anshuman Khandual >> --- >> arch/alpha/include/asm/pgtable.h | 1 - >> arch/arc/include/asm/pgtable.h | 6 -- >> arch/arm/Kconfig | 1 + >> arch/arm64/include/asm/pgtable.h | 2 -- >> arch/csky/include/asm/pgtable.h | 1 - >> arch/hexagon/include/asm/pgtable.h | 3 --- >> arch/ia64/include/asm/pgtable.h | 1 - >> arch/m68k/include/asm/pgtable_mm.h | 1 - >> arch/microblaze/include/asm/pgtable.h | 2 -- >> arch/mips/include/asm/pgtable-32.h | 1 - >> arch/mips/include/asm/pgtable-64.h | 1 - >> arch/nds32/Kconfig | 1 + >> arch/nios2/include/asm/pgtable.h | 2 -- >> arch/openrisc/include/asm/pgtable.h | 1 - >> arch/parisc/include/asm/pgtable.h | 2 -- >> arch/powerpc/include/asm/book3s/pgtable.h | 1 - >> arch/powerpc/include/asm/nohash/32/pgtable.h | 1 - >> arch/powerpc/include/asm/nohash/64/pgtable.h | 2 -- >> arch/riscv/include/asm/pgtable.h | 2 -- >> arch/s390/include/asm/pgtable.h | 2 -- >> arch/sh/include/asm/pgtable.h | 2 -- >> arch/sparc/include/asm/pgtable_32.h | 1 - >> arch/sparc/include/asm/pgtable_64.h | 3 --- >> arch/um/include/asm/pgtable-2level.h | 1 - >> arch/um/include/asm/pgtable-3level.h | 1 - >> arch/x86/include/asm/pgtable_types.h | 2 -- >> arch/xtensa/include/asm/pgtable.h | 1 - >> include/linux/mm.h | 4 >> mm/Kconfig | 4 >> 29 files changed, 10 insertions(+), 43 deletions(-) >> >> diff --git a/include/linux/mm.h b/include/linux/mm.h >> index 8ba434287387..47098ccd715e 100644 >> --- a/include/linux/mm.h >> +++ b/include/linux/mm.h >> @@ -46,6 +46,10 @@ extern int sysctl_page_lock_unfairness; >> void init_mm_internals(void); >> +#ifndef ARCH_HAS_FIRST_USER_ADDRESS > > I guess you didn't test it . :) In fact I did :) Though just booted it on arm64 and cross compiled on multiple others platforms. > > should be #ifndef CONFIG_ARCH_HAS_FIRST_USER_ADDRESS Right, meant that instead. > >> +#define FIRST_USER_ADDRESS 0UL >> +#endif > > But why do we need a config option at all for that ? > > Why not just: > > #ifndef FIRST_USER_ADDRESS > #define FIRST_USER_ADDRESS 0UL > #endif This sounds simpler. But just wondering, would not there be any possibility of build problems due to compilation sequence between arch and generic code ? ___ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
Re: [PATCH] mm: Define ARCH_HAS_FIRST_USER_ADDRESS
Le 14/04/2021 à 04:54, Anshuman Khandual a écrit : Currently most platforms define FIRST_USER_ADDRESS as 0UL duplicating the same code all over. Instead define a new option ARCH_HAS_FIRST_USER_ADDRESS for those platforms which would override generic default FIRST_USER_ADDRESS value 0UL. This makes it much cleaner with reduced code. Cc: linux-al...@vger.kernel.org Cc: linux-snps-arc@lists.infradead.org Cc: linux-arm-ker...@lists.infradead.org Cc: linux-c...@vger.kernel.org Cc: linux-hexa...@vger.kernel.org Cc: linux-i...@vger.kernel.org Cc: linux-m...@lists.linux-m68k.org Cc: linux-m...@vger.kernel.org Cc: openr...@lists.librecores.org Cc: linux-par...@vger.kernel.org Cc: linuxppc-...@lists.ozlabs.org Cc: linux-ri...@lists.infradead.org Cc: linux-s...@vger.kernel.org Cc: linux...@vger.kernel.org Cc: sparcli...@vger.kernel.org Cc: linux...@lists.infradead.org Cc: linux-xte...@linux-xtensa.org Cc: x...@kernel.org Cc: linux...@kvack.org Cc: linux-ker...@vger.kernel.org Signed-off-by: Anshuman Khandual --- arch/alpha/include/asm/pgtable.h | 1 - arch/arc/include/asm/pgtable.h | 6 -- arch/arm/Kconfig | 1 + arch/arm64/include/asm/pgtable.h | 2 -- arch/csky/include/asm/pgtable.h | 1 - arch/hexagon/include/asm/pgtable.h | 3 --- arch/ia64/include/asm/pgtable.h | 1 - arch/m68k/include/asm/pgtable_mm.h | 1 - arch/microblaze/include/asm/pgtable.h| 2 -- arch/mips/include/asm/pgtable-32.h | 1 - arch/mips/include/asm/pgtable-64.h | 1 - arch/nds32/Kconfig | 1 + arch/nios2/include/asm/pgtable.h | 2 -- arch/openrisc/include/asm/pgtable.h | 1 - arch/parisc/include/asm/pgtable.h| 2 -- arch/powerpc/include/asm/book3s/pgtable.h| 1 - arch/powerpc/include/asm/nohash/32/pgtable.h | 1 - arch/powerpc/include/asm/nohash/64/pgtable.h | 2 -- arch/riscv/include/asm/pgtable.h | 2 -- arch/s390/include/asm/pgtable.h | 2 -- arch/sh/include/asm/pgtable.h| 2 -- arch/sparc/include/asm/pgtable_32.h | 1 - arch/sparc/include/asm/pgtable_64.h | 3 --- arch/um/include/asm/pgtable-2level.h | 1 - arch/um/include/asm/pgtable-3level.h | 1 - arch/x86/include/asm/pgtable_types.h | 2 -- arch/xtensa/include/asm/pgtable.h| 1 - include/linux/mm.h | 4 mm/Kconfig | 4 29 files changed, 10 insertions(+), 43 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 8ba434287387..47098ccd715e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -46,6 +46,10 @@ extern int sysctl_page_lock_unfairness; void init_mm_internals(void); +#ifndef ARCH_HAS_FIRST_USER_ADDRESS I guess you didn't test it . :) should be #ifndef CONFIG_ARCH_HAS_FIRST_USER_ADDRESS +#define FIRST_USER_ADDRESS 0UL +#endif But why do we need a config option at all for that ? Why not just: #ifndef FIRST_USER_ADDRESS #define FIRST_USER_ADDRESS 0UL #endif + #ifndef CONFIG_NEED_MULTIPLE_NODES/* Don't use mapnrs, do it properly */ extern unsigned long max_mapnr; diff --git a/mm/Kconfig b/mm/Kconfig index 24c045b24b95..373fbe377075 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -806,6 +806,10 @@ config VMAP_PFN config ARCH_USES_HIGH_VMA_FLAGS bool + +config ARCH_HAS_FIRST_USER_ADDRESS + bool + config ARCH_HAS_PKEYS bool ___ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc
