linux-kernel - Re: [PATCH v4 03/36] mm/slub: Mark slab_free_freelist_hook() __always

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Message-ID: <CA+CK2bD8Cr1V2=PWAsf6CwDnakZ54Qaf_q5t4aVYV-jXQPtPbg@mail.gmail.com>
Date: Wed, 21 Feb 2024 16:15:56 -0500
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Suren Baghdasaryan <surenb@...gle.com>
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Subject: Re: [PATCH v4 03/36] mm/slub: Mark slab_free_freelist_hook() __always_inline

On Wed, Feb 21, 2024 at 2:41 PM Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> From: Kent Overstreet <kent.overstreet@...ux.dev>
>
> It seems we need to be more forceful with the compiler on this one.
> This is done for performance reasons only.
>
> Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> ---
>  mm/slub.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/slub.c b/mm/slub.c
> index 2ef88bbf56a3..d31b03a8d9d5 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -2121,7 +2121,7 @@ bool slab_free_hook(struct kmem_cache *s, void *x, bool init)
>         return !kasan_slab_free(s, x, init);
>  }
>
> -static inline bool slab_free_freelist_hook(struct kmem_cache *s,
> +static __always_inline bool slab_free_freelist_hook(struct kmem_cache *s,

__fastpath_inline seems to me more appropriate here. It prioritizes
memory vs performance.

>                                            void **head, void **tail,
>                                            int *cnt)
>  {
> --
> 2.44.0.rc0.258.g7320e95886-goog
>