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Date: Mon, 23 May 2022 19:04:36 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Stephen Rothwell <sfr@...b.auug.org.au>, "Peter Zijlstra (Intel)" <peterz@...radead.org>, Martin Willi <martin@...ongswan.org>, Herbert Xu <herbert@...dor.apana.org.au>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.4 09/68] crypto: x86/chacha20 - Avoid spurious jumps to other functions From: Peter Zijlstra <peterz@...radead.org> [ Upstream commit 4327d168515fd8b5b92fa1efdf1d219fb6514460 ] The chacha_Nblock_xor_avx512vl() functions all have their own, identical, .LdoneN label, however in one particular spot {2,4} jump to the 8 version instead of their own. Resulting in: arch/x86/crypto/chacha-x86_64.o: warning: objtool: chacha_2block_xor_avx512vl() falls through to next function chacha_8block_xor_avx512vl() arch/x86/crypto/chacha-x86_64.o: warning: objtool: chacha_4block_xor_avx512vl() falls through to next function chacha_8block_xor_avx512vl() Make each function consistently use its own done label. Reported-by: Stephen Rothwell <sfr@...b.auug.org.au> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> Reviewed-by: Martin Willi <martin@...ongswan.org> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au> Signed-off-by: Sasha Levin <sashal@...nel.org> --- arch/x86/crypto/chacha-avx512vl-x86_64.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/crypto/chacha-avx512vl-x86_64.S b/arch/x86/crypto/chacha-avx512vl-x86_64.S index 848f9c75fd4f..596f91e3a774 100644 --- a/arch/x86/crypto/chacha-avx512vl-x86_64.S +++ b/arch/x86/crypto/chacha-avx512vl-x86_64.S @@ -172,7 +172,7 @@ ENTRY(chacha_2block_xor_avx512vl) # xor remaining bytes from partial register into output mov %rcx,%rax and $0xf,%rcx - jz .Ldone8 + jz .Ldone2 mov %rax,%r9 and $~0xf,%r9 @@ -438,7 +438,7 @@ ENTRY(chacha_4block_xor_avx512vl) # xor remaining bytes from partial register into output mov %rcx,%rax and $0xf,%rcx - jz .Ldone8 + jz .Ldone4 mov %rax,%r9 and $~0xf,%r9 -- 2.35.1
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