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authorKumar Gala <galak@kernel.crashing.org>2007-10-18 17:53:19 -0400
committerKumar Gala <galak@kernel.crashing.org>2007-11-09 04:47:29 -0500
commit0197cd2e350a7151080e7335577e956f1f84a8cb (patch)
tree4ac1a37fbb9a8b8ec6c98f3d692bcd18c8b439b2 /arch/powerpc/Makefile
parent688016f4e2028e3c2c27e959ad001536e10ee2c5 (diff)
[POWERPC] Add -mno-spe for ARCH=powerpc builds
Newer GCC's are capable of autovectorization for ISA extensions like AltiVec and SPE. If we happen to build with one of those compilers we will get SPE instructions in random kernel code. Today we only allow basic interger code in the kernel and FP, AltiVec, or SPE in special explicit locations that have handled the proper saving and restoring of the register state (since on uniprocessor we lazy context switch the register state for FP, AltiVec, and SPE). -mno-spe disables the compiler for automatically generating SPE instructions without our knowledge. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/Makefile')
-rw-r--r--arch/powerpc/Makefile3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 4e165342210..bd87626c1f6 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -107,6 +107,9 @@ endif
107# No AltiVec instruction when building kernel 107# No AltiVec instruction when building kernel
108KBUILD_CFLAGS += $(call cc-option,-mno-altivec) 108KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
109 109
110# No SPE instruction when building kernel
111KBUILD_CFLAGS += $(call cc-option,-mno-spe)
112
110# Enable unit-at-a-time mode when possible. It shrinks the 113# Enable unit-at-a-time mode when possible. It shrinks the
111# kernel considerably. 114# kernel considerably.
112KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) 115KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)