linux-kernel - Re: [PATCH] [v2] crypto: serpent - mark __serpent_setkey

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Message-ID: <20190628041912.qprczc23gzeelag7@gondor.apana.org.au>
Date:   Fri, 28 Jun 2019 12:19:12 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Biggers <ebiggers@...gle.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] crypto: serpent - mark __serpent_setkey_sbox
 noinline

On Tue, Jun 18, 2019 at 01:19:42PM +0200, Arnd Bergmann wrote:
> The same bug that gcc hit in the past is apparently now showing
> up with clang, which decides to inline __serpent_setkey_sbox:
> 
> crypto/serpent_generic.c:268:5: error: stack frame size of 2112 bytes in function '__serpent_setkey' [-Werror,-Wframe-larger-than=]
> 
> Marking it 'noinline' reduces the stack usage from 2112 bytes to
> 192 and 96 bytes, respectively, and seems to generate more
> useful object code.
> 
> Fixes: c871c10e4ea7 ("crypto: serpent - improve __serpent_setkey with UBSAN")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> v2: style improvements suggested by Eric Biggers
> ---
>  crypto/serpent_generic.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt