linux-kernel - Re: [PATCH v1 1/1] mm: Remove unused stub for can_swapin

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Message-ID: <CAGsJ_4w3wBG7SvmoAFsnOBbNihAO+ioiNJmU1tEObwFNq5nnQg@mail.gmail.com>
Date: Wed, 9 Oct 2024 10:09:05 +0800
From: Barry Song <21cnbao@...il.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, 
	Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, 
	Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
	Chuanhua Han <hanchuanhua@...o.com>, Barry Song <v-songbaohua@...o.com>
Subject: Re: [PATCH v1 1/1] mm: Remove unused stub for can_swapin_thp()

On Wed, Oct 9, 2024 at 3:13 AM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> When can_swapin_thp() is unused, it prevents kernel builds
> with clang, `make W=1` and CONFIG_WERROR=y:
>
> mm/memory.c:4184:20: error: unused function 'can_swapin_thp' [-Werror,-Wunused-function]
>
> Fix this by removing the unused stub.
>
> See also commit 6863f5643dd7 ("kbuild: allow Clang to find unused static
> inline functions for W=1 build").
>
> Fixes: 242d12c98174 ("mm: support large folios swap-in for sync io devices")
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Acked-by: Barry Song <baohua@...nel.org>

> ---
>  mm/memory.c | 5 -----
>  1 file changed, 5 deletions(-)
>
> diff --git a/mm/memory.c b/mm/memory.c
> index 2366578015ad..c0869a962ddd 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -4181,11 +4181,6 @@ static struct folio *alloc_swap_folio(struct vm_fault *vmf)
>         return __alloc_swap_folio(vmf);
>  }
>  #else /* !CONFIG_TRANSPARENT_HUGEPAGE */
> -static inline bool can_swapin_thp(struct vm_fault *vmf, pte_t *ptep, int nr_pages)
> -{
> -       return false;
> -}
> -
>  static struct folio *alloc_swap_folio(struct vm_fault *vmf)
>  {
>         return __alloc_swap_folio(vmf);
> --
> 2.43.0.rc1.1336.g36b5255a03ac
>
>