linux-kernel - Re: [PATCH] mm/codetag: fix arg in pgalloc_tag_copy alloc_tag

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Message-ID: <CA+CK2bCnLyEpT-Tr_GGqTzWcNOviE93cyb=WQ09ksYexbzJ7_A@mail.gmail.com>
Date: Tue, 22 Oct 2024 17:03:09 -0400
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Sourav Panda <souravpanda@...gle.com>
Cc: akpm@...ux-foundation.org, surenb@...gle.com, yuzhao@...gle.com, 
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, weixugc@...gle.com
Subject: Re: [PATCH] mm/codetag: fix arg in pgalloc_tag_copy alloc_tag_sub

On Tue, Oct 22, 2024 at 4:56 PM Sourav Panda <souravpanda@...gle.com> wrote:
>
> alloc_tag_sub() takes bytes as opposed to number of pages as argument.
>
> Currently pgalloc_tag_copy() passes the number of pages. This fix passes
> the current unit, which is the number of bytes allocated.
>
> Fixes: e0a955bf7f61 ("mm/codetag: add pgalloc_tag_copy()")
> Signed-off-by: Sourav Panda <souravpanda@...gle.com>

Reviewed-by: Pasha Tatashin <pasha.tatashin@...een.com>

Thanks,
Pasha

> ---
>  include/linux/mm.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index ecf63d2b0582..2890001c8b97 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -4203,7 +4203,7 @@ static inline void pgalloc_tag_copy(struct folio *new, struct folio *old)
>         /* Clear the old ref to the original allocation tag. */
>         clear_page_tag_ref(&old->page);
>         /* Decrement the counters of the tag on get_new_folio. */
> -       alloc_tag_sub(ref, folio_nr_pages(new));
> +       alloc_tag_sub(ref, folio_size(new));
>
>         __alloc_tag_ref_set(ref, tag);
>
> --
> 2.47.0.105.g07ac214952-goog
>