linux-kernel - Re: [PATCH] crypto: ccree - reduce kernel stack usage with clang

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Message-ID: <20190322130416.qxpznh6d3z6yhppx@gondor.apana.org.au>
Date:   Fri, 22 Mar 2019 21:04:16 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Gilad Ben-Yossef <gilad@...yossef.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Biggers <ebiggers@...gle.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: ccree - reduce kernel stack usage with clang

On Thu, Mar 14, 2019 at 10:09:44AM +0100, Arnd Bergmann wrote:
> Building with clang for a 32-bit architecture runs over the stack
> frame limit in the setkey function:
> 
> drivers/crypto/ccree/cc_cipher.c:318:12: error: stack frame size of 1152 bytes in function 'cc_cipher_setkey' [-Werror,-Wframe-larger-than=]
> 
> The problem is that there are two large variables: the temporary
> 'tmp' array and the SHASH_DESC_ON_STACK() declaration. Moving
> the first into the block in which it is used reduces the
> total frame size to 768 bytes, which seems more reasonable
> and is under the warning limit.
> 
> Fixes: 63ee04c8b491 ("crypto: ccree - add skcipher support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/crypto/ccree/cc_cipher.c | 2 +-
>  1 file changed, 1 insertion(+), 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