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From: Ingo Molnar <mingo@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: [GIT PULL] x86/build change for v3.15
Date: Mon, 31 Mar 2014 14:36:09 +0200	[thread overview]
Message-ID: <20140331123609.GA9460@gmail.com> (raw)

Linus,

Please pull the latest x86-build-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-build-for-linus

   # HEAD: b399fe355b30d0102e7690c99e6f764ddfd32ec3 x86: Disable generation of traditional x87 instructions

Explicitly disable x87 FPU instructions, to catch mistaken floating 
point use at build time, instead of crashing or misbehaving during run 
time.

 Thanks,

	Ingo

------------------>
Borislav Petkov (1):
      x86: Disable generation of traditional x87 instructions


 arch/x86/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index eeda43a..a414b14 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -82,8 +82,8 @@ else
         KBUILD_AFLAGS += -m64
         KBUILD_CFLAGS += -m64
 
-        # Don't autogenerate MMX or SSE instructions
-        KBUILD_CFLAGS += -mno-mmx -mno-sse
+        # Don't autogenerate traditional x87, MMX or SSE instructions
+        KBUILD_CFLAGS += -mno-mmx -mno-sse -mno-80387 -mno-fp-ret-in-387
 
 	# Use -mpreferred-stack-boundary=3 if supported.
 	KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)

                 reply	other threads:[~2014-03-31 12:36 UTC|newest]

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