linux-kernel - [tip: x86/urgent] x86: math-emu: Fix up 'cmp' insn for clang ias

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Message-ID: <159491343346.4006.6445776713545348721.tip-bot2@tip-bot2>
Date:   Thu, 16 Jul 2020 15:30:33 -0000
From:   "tip-bot2 for Arnd Bergmann" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/urgent] x86: math-emu: Fix up 'cmp' insn for clang ias

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

Commit-ID:     81e96851ea32deb2c921c870eecabf335f598aeb
Gitweb:        https://git.kernel.org/tip/81e96851ea32deb2c921c870eecabf335f598aeb
Author:        Arnd Bergmann <arnd@...db.de>
AuthorDate:    Wed, 27 May 2020 15:53:46 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Thu, 16 Jul 2020 17:26:42 +02:00

x86: math-emu: Fix up 'cmp' insn for clang ias

The clang integrated assembler requires the 'cmp' instruction to
have a length prefix here:

arch/x86/math-emu/wm_sqrt.S:212:2: error: ambiguous instructions require an explicit suffix (could be 'cmpb', 'cmpw', or 'cmpl')
 cmp $0xffffffff,-24(%ebp)
 ^

Make this a 32-bit comparison, which it was clearly meant to be.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Link: https://lkml.kernel.org/r/20200527135352.1198078-1-arnd@arndb.de

---
 arch/x86/math-emu/wm_sqrt.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/math-emu/wm_sqrt.S b/arch/x86/math-emu/wm_sqrt.S
index 3b2b581..40526dd 100644
--- a/arch/x86/math-emu/wm_sqrt.S
+++ b/arch/x86/math-emu/wm_sqrt.S
@@ -209,7 +209,7 @@ sqrt_stage_2_finish:
 
 #ifdef PARANOID
 /* It should be possible to get here only if the arg is ffff....ffff */
-	cmp	$0xffffffff,FPU_fsqrt_arg_1
+	cmpl	$0xffffffff,FPU_fsqrt_arg_1
 	jnz	sqrt_stage_2_error
 #endif /* PARANOID */