Re: [PATCH] mm: remove kern_addr_valid() completely

WANG Xuerui
2022-10-18T09:20:37Z

On 2022/10/18 15:40, Kefeng Wang wrote:
> Most architectures(except arm64/x86/sparc) simply return 1 for

one space before the opening parens

> kern_addr_valid(), which is only used in read_kcore(), and it
> calls copy_from_kernel_nofault() which could check whether the
> address is a valid kernel address, so no need kern_addr_valid(),

minor grammatical nit:

"... which already checks whether the address is a valid kernel address.
So kern_addr_valid is unnecessary, let's remove it."

> let's remove unneeded kern_addr_valid() completely.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
> ---
> arch/alpha/include/asm/pgtable.h | 2 -
> arch/arc/include/asm/pgtable-bits-arcv2.h | 2 -
> arch/arm/include/asm/pgtable-nommu.h | 2 -
> arch/arm/include/asm/pgtable.h | 4 --
> arch/arm64/include/asm/pgtable.h | 2 -
> arch/arm64/mm/mmu.c | 47 -----------------------
> arch/arm64/mm/pageattr.c | 3 +-
> arch/csky/include/asm/pgtable.h | 3 --
> arch/hexagon/include/asm/page.h | 7 ----
> arch/ia64/include/asm/pgtable.h | 16 --------
> arch/loongarch/include/asm/pgtable.h | 2 -
> arch/m68k/include/asm/pgtable_mm.h | 2 -
> arch/m68k/include/asm/pgtable_no.h | 1 -
> arch/microblaze/include/asm/pgtable.h | 3 --
> arch/mips/include/asm/pgtable.h | 2 -
> arch/nios2/include/asm/pgtable.h | 2 -
> arch/openrisc/include/asm/pgtable.h | 2 -
> arch/parisc/include/asm/pgtable.h | 15 --------
> arch/powerpc/include/asm/pgtable.h | 7 ----
> 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 | 6 ---
> arch/sparc/mm/init_32.c | 3 +-
> arch/sparc/mm/init_64.c | 1 -
> arch/um/include/asm/pgtable.h | 2 -
> arch/x86/include/asm/pgtable_32.h | 9 -----
> arch/x86/include/asm/pgtable_64.h | 1 -
> arch/x86/mm/init_64.c | 41 --------------------
> arch/xtensa/include/asm/pgtable.h | 2 -
> fs/proc/kcore.c | 26 +++++--------
> 31 files changed, 11 insertions(+), 210 deletions(-)
>
> diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
> index 946704bee599..fc70b7041b76 100644
> --- a/arch/loongarch/include/asm/pgtable.h
> +++ b/arch/loongarch/include/asm/pgtable.h
> @@ -421,8 +421,6 @@ static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
> __update_tlb(vma, address, (pte_t *)pmdp);
> }
>
> -#define kern_addr_valid(addr) (1)
> -
> static inline unsigned long pmd_pfn(pmd_t pmd)
> {
> return (pmd_val(pmd) & _PFN_MASK) >> _PFN_SHIFT;

Acked-by: WANG Xuerui <git@xen0n.name> # loongarch

Thanks!

--
WANG "xen0n" Xuerui

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