linux-kernel - Re: [PATCH] mm/filemap: add static for function __add_to_page_cache

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Message-ID: <20201106182409.GC3976735@iweiny-DESK2.sc.intel.com>
Date:   Fri, 6 Nov 2020 10:24:09 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     Alex Shi <alex.shi@...ux.alibaba.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/filemap: add static for function
 __add_to_page_cache_locked

On Fri, Nov 06, 2020 at 07:24:55PM +0800, Alex Shi wrote:
> Otherwise it cause gcc warning:
>           ^~~~~~~~~~~~~~~
> ../mm/filemap.c:830:14: warning: no previous prototype for
> ‘__add_to_page_cache_locked’ [-Wmissing-prototypes]
>  noinline int __add_to_page_cache_locked(struct page *page,
>               ^~~~~~~~~~~~~~~~~~~~~~~~~~
>

Does this affect the use in:

kernel/bpf/verifier.c|11478| BTF_ID(func, __add_to_page_cache_locked)                                                                           

?

It does not look like that calls the function but I'm not sure what BTF_ID
does?

Ira

> 
> Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org> 
> Cc: linux-mm@...ck.org 
> Cc: linux-kernel@...r.kernel.org 
> ---
>  mm/filemap.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/filemap.c b/mm/filemap.c
> index d90614f501da..249cf489f5df 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -827,7 +827,7 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
>  }
>  EXPORT_SYMBOL_GPL(replace_page_cache_page);
>  
> -noinline int __add_to_page_cache_locked(struct page *page,
> +static noinline int __add_to_page_cache_locked(struct page *page,
>  					struct address_space *mapping,
>  					pgoff_t offset, gfp_t gfp,
>  					void **shadowp)
> -- 
> 1.8.3.1
>