linux-kernel - Re: [PATCH] ubifs: replay: Fix high stack usage, again

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Date:   Fri, 15 Jan 2021 11:38:24 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Richard Weinberger <richard@....at>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Zhihao Cheng <chengzhihao1@...wei.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Wang Hai <wanghai38@...wei.com>, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] ubifs: replay: Fix high stack usage, again

On Thu, Jan 14, 2021 at 10:30:11PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> An earlier commit moved out some functions to not be inlined by gcc, but
> after some other rework to remove one of those, clang started inlining
> the other one and ran into the same problem as gcc did before:
> 
> fs/ubifs/replay.c:1174:5: error: stack frame size of 1152 bytes in function 'ubifs_replay_journal' [-Werror,-Wframe-larger-than=]
> 
> Mark the function as noinline_for_stack to ensure it doesn't happen
> again.
> 
> Fixes: f80df3851246 ("ubifs: use crypto_shash_tfm_digest()")
> Fixes: eb66eff6636d ("ubifs: replay: Fix high stack usage")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

> ---
>  fs/ubifs/replay.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ubifs/replay.c b/fs/ubifs/replay.c
> index 79801c9a5b87..0f8a6a16421b 100644
> --- a/fs/ubifs/replay.c
> +++ b/fs/ubifs/replay.c
> @@ -559,7 +559,9 @@ static int is_last_bud(struct ubifs_info *c, struct ubifs_bud *bud)
>  }
>  
>  /* authenticate_sleb_hash is split out for stack usage */
> -static int authenticate_sleb_hash(struct ubifs_info *c, struct shash_desc *log_hash, u8 *hash)
> +static int noinline_for_stack
> +authenticate_sleb_hash(struct ubifs_info *c,
> +		       struct shash_desc *log_hash, u8 *hash)
>  {
>  	SHASH_DESC_ON_STACK(hash_desc, c->hash_tfm);
>  
> -- 
> 2.29.2
>