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authorDmitry Vyukov <dvyukov@google.com>2018-06-08 12:53:41 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2018-06-15 18:06:48 +0300
commitf044a84e040b85cd609851ac88ae8b54b2cc0b75 (patch)
tree29a62e2d18f271335ba95eed8b9863fb0684927c /crypto
parent6e88f01206edab0e5bc105d8f35fac10f4ee14c5 (diff)
downloadlinux-f044a84e040b85cd609851ac88ae8b54b2cc0b75.tar.xz
crypto: don't optimize keccakf()
keccakf() is the only function in kernel that uses __optimize() macro. __optimize() breaks frame pointer unwinder as optimized code uses RBP, and amusingly this always lead to degraded performance as gcc does not inline across different optimizations levels, so keccakf() wasn't inlined into its callers and keccakf_round() wasn't inlined into keccakf(). Drop __optimize() to resolve both problems. Signed-off-by: Dmitry Vyukov <dvyukov@google.com> Fixes: 83dee2ce1ae7 ("crypto: sha3-generic - rewrite KECCAK transform to help the compiler optimize") Reported-by: syzbot+37035ccfa9a0a017ffcf@syzkaller.appspotmail.com Reported-by: syzbot+e073e4740cfbb3ae200b@syzkaller.appspotmail.com Cc: linux-crypto@vger.kernel.org Cc: "David S. Miller" <davem@davemloft.net> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/sha3_generic.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/sha3_generic.c b/crypto/sha3_generic.c
index 264ec12c0b9c..7f6735d9003f 100644
--- a/crypto/sha3_generic.c
+++ b/crypto/sha3_generic.c
@@ -152,7 +152,7 @@ static SHA3_INLINE void keccakf_round(u64 st[25])
st[24] ^= bc[ 4];
}
-static void __optimize("O3") keccakf(u64 st[25])
+static void keccakf(u64 st[25])
{
int round;