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@xxxxxxxxxx>
Fixes: 83dee2ce1ae7 ("crypto: sha3-generic - rewrite KECCAK transform to help the compiler optimize")
Reported-by: syzbot+37035ccfa9a0a017ffcf@xxxxxxxxxxxxxxxxxxxxxxxxx
Reported-by: syzbot+e073e4740cfbb3ae200b@xxxxxxxxxxxxxxxxxxxxxxxxx
Cc: linux-crypto@xxxxxxxxxxxxxxx
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
crypto/sha3_generic.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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;
--
2.18.0.rc1.242.g61856ae69a-goog
