linux-kernel - [PATCH] x86-32, fpu: unbreak FPU exceptions on systems without SSE

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Message-ID: <1302024392-610677-1-git-send-email-hans.rosenfeld@amd.com>
Date:	Tue, 5 Apr 2011 19:26:32 +0200
From:	Hans Rosenfeld <hans.rosenfeld@....com>
To:	<hpa@...or.com>, <brgerst@...il.com>
CC:	<tglx@...utronix.de>, <mingo@...e.hu>, <suresh.b.siddha@...el.com>,
	<Andreas.Herrmann3@....com>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>,
	Hans Rosenfeld <hans.rosenfeld@....com>
Subject: [PATCH] x86-32, fpu: unbreak FPU exceptions on systems without SSE

On 32bit systems without SSE, FPU exceptions in user mode cause Oopses,
BUGs, recursive faults and other nasty things.

This was caused by commit 58a992b9cbaf449aeebd3575c3695a9eb5d95b5e:
	x86-32, fpu: Rewrite fpu_save_init()
---
 arch/x86/include/asm/i387.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
index ef32890..c9e09ea 100644
--- a/arch/x86/include/asm/i387.h
+++ b/arch/x86/include/asm/i387.h
@@ -237,7 +237,7 @@ static inline void fpu_save_init(struct fpu *fpu)
 	} else if (use_fxsr()) {
 		fpu_fxsave(fpu);
 	} else {
-		asm volatile("fsave %[fx]; fwait"
+		asm volatile("fnsave %[fx]; fwait"
 			     : [fx] "=m" (fpu->state->fsave));
 		return;
 	}
-- 
1.5.6.5


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