Messages in this thread | | | Subject | Re: [PATCH] arm64/mm: Drop SECTION_[SHIFT|SIZE|MASK] | From | Gavin Shan <> | Date | Mon, 14 Jun 2021 22:40:17 +1000 |
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On 6/14/21 6:18 PM, Anshuman Khandual wrote: > SECTION_[SHIFT|SIZE|MASK] are essentially PMD_[SHIFT|SIZE|MASK]. But these > create confusion being similar to generic sparsemem memory sections, which > are derived from SECTION_SIZE_BITS. Section references have always implied > PMD level block mapping. Instead just use all PMD level macros which would > make it explicit and also remove confusion with sparsmem memory sections. > > Cc: Catalin Marinas <catalin.marinas@arm.com> > Cc: Will Deacon <will@kernel.org> > Cc: Mark Rutland <mark.rutland@arm.com> > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > --- > This applies on v5.13-rc6. > > arch/arm64/include/asm/kernel-pgtable.h | 4 ++-- > arch/arm64/include/asm/pgtable-hwdef.h | 7 ------- > arch/arm64/mm/mmu.c | 2 +- > 3 files changed, 3 insertions(+), 10 deletions(-) >
It does introduce confusion to sparsemem section. The changes look good to me:
Reviewed-by: Gavin Shan <gshan@redhat.com>
> diff --git a/arch/arm64/include/asm/kernel-pgtable.h b/arch/arm64/include/asm/kernel-pgtable.h > index d44df9d62fc9..88b8d681ad91 100644 > --- a/arch/arm64/include/asm/kernel-pgtable.h > +++ b/arch/arm64/include/asm/kernel-pgtable.h > @@ -91,8 +91,8 @@ > > /* Initial memory map size */ > #if ARM64_SWAPPER_USES_SECTION_MAPS > -#define SWAPPER_BLOCK_SHIFT SECTION_SHIFT > -#define SWAPPER_BLOCK_SIZE SECTION_SIZE > +#define SWAPPER_BLOCK_SHIFT PMD_SHIFT > +#define SWAPPER_BLOCK_SIZE PMD_SIZE > #define SWAPPER_TABLE_SHIFT PUD_SHIFT > #else > #define SWAPPER_BLOCK_SHIFT PAGE_SHIFT > diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h > index b82575a33f8b..40085e53f573 100644 > --- a/arch/arm64/include/asm/pgtable-hwdef.h > +++ b/arch/arm64/include/asm/pgtable-hwdef.h > @@ -71,13 +71,6 @@ > #define PGDIR_MASK (~(PGDIR_SIZE-1)) > #define PTRS_PER_PGD (1 << (VA_BITS - PGDIR_SHIFT)) > > -/* > - * Section address mask and size definitions. > - */ > -#define SECTION_SHIFT PMD_SHIFT > -#define SECTION_SIZE (_AC(1, UL) << SECTION_SHIFT) > -#define SECTION_MASK (~(SECTION_SIZE-1)) > - > /* > * Contiguous page definitions. > */ > diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c > index 89b66ef43a0f..380771610dd2 100644 > --- a/arch/arm64/mm/mmu.c > +++ b/arch/arm64/mm/mmu.c > @@ -228,7 +228,7 @@ static void init_pmd(pud_t *pudp, unsigned long addr, unsigned long end, > next = pmd_addr_end(addr, end); > > /* try section mapping first */ > - if (((addr | next | phys) & ~SECTION_MASK) == 0 && > + if (((addr | next | phys) & ~PMD_MASK) == 0 && > (flags & NO_BLOCK_MAPPINGS) == 0) { > pmd_set_huge(pmdp, phys, prot); > >
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