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

[WANG Xuerui <kernel@xxxxxxxxxx>]

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@xxxxxxxxxx>
> ---
>   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@xxxxxxxxxx> # loongarch

Thanks!

--
WANG "xen0n" Xuerui

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