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author | Andy Lutomirski <luto@kernel.org> | 2015-07-21 09:27:18 -0700 |
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committer | Ingo Molnar <mingo@kernel.org> | 2015-07-22 08:20:29 +0200 |
commit | b2c51106c7581866c37ffc77c5d739f3d4b7cbc9 (patch) | |
tree | 228177956681a7e4b1afec070d12f2071dafc740 /arch/um | |
parent | f2a50f8b7da45ff2de93a71393e715a2ab9f3b68 (diff) | |
download | linux-b2c51106c7581866c37ffc77c5d739f3d4b7cbc9.tar.bz2 |
x86/build: Fix detection of GCC -mpreferred-stack-boundary support
As per:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
GCC only allows -mpreferred-stack-boundary=3 on x86_64 if -mno-sse is set.
That means that cc-option will not detect -mpreferred-stack-boundary=3
support, because we test for it before setting -mno-sse.
Fix it by reordering the Makefile bits.
Compile-tested only. This should help avoid code generation
issues such as the one that was worked around in:
b96fecbfa8c8 ("x86/fpu: Fix boot crash in the early FPU code")
I'm a bit concerned that we could still have problems on older
GCC versions given that our asm code does not respect GCC's idea
of the ABI-required stack alignment.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/f5297c192969adfa0d28b84cf8a22d59573db26d.1436126872.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/um')
0 files changed, 0 insertions, 0 deletions