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: 7740c324b53f ("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>

diff --git a/crypto/sha3_generic.c b/crypto/sha3_generic.c
index 264ec12c0b9c334a16d743651771a18b616616a0..7f6735d9003f13c1e4adb7ffde8d8be5cc700fe1 100644 (file)
--- 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;