linux-kernel - [tip: x86/asm] x86/percpu: Remove "e" constraint from XADD

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Date:   Thu, 23 Jul 2020 10:43:42 -0000
From:   "tip-bot2 for Brian Gerst" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Brian Gerst <brgerst@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Dennis Zhou <dennis@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/asm] x86/percpu: Remove "e" constraint from XADD

The following commit has been merged into the x86/asm branch of tip:

Commit-ID:     e4d16defbbde028aeab2026995f0ced4240df6d6
Gitweb:        https://git.kernel.org/tip/e4d16defbbde028aeab2026995f0ced4240df6d6
Author:        Brian Gerst <brgerst@...il.com>
AuthorDate:    Mon, 20 Jul 2020 13:49:19 -07:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 23 Jul 2020 11:46:40 +02:00

x86/percpu: Remove "e" constraint from XADD

The "e" constraint represents a constant, but the XADD instruction doesn't
accept immediate operands.

Signed-off-by: Brian Gerst <brgerst@...il.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>
Tested-by: Sedat Dilek <sedat.dilek@...il.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Acked-by: Linus Torvalds <torvalds@...ux-foundation.org>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Dennis Zhou <dennis@...nel.org>
Link: https://lkml.kernel.org/r/20200720204925.3654302-6-ndesaulniers@google.com

---
 arch/x86/include/asm/percpu.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 2a24f3c..9bb5440 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -220,7 +220,7 @@ do {									\
 		break;							\
 	case 8:								\
 		asm qual ("xaddq %0, "__percpu_arg(1)			\
-			    : "+re" (paro_ret__), "+m" (var)		\
+			    : "+r" (paro_ret__), "+m" (var)		\
 			    : : "memory");				\
 		break;							\
 	default: __bad_percpu_size();					\