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authorNick Piggin <npiggin@suse.de>2008-01-30 07:32:31 -0500
committerIngo Molnar <mingo@elte.hu>2008-01-30 07:32:31 -0500
commitfb0328e2e6407d6f48a608aefa62b2be91989e7e (patch)
tree63b622b88dd422a0c6a62daa649ba48e9870f653
parent583d0e90ea52f02ae4d103359ee59e8218799e27 (diff)
x86: reduce CONFIG_X86_PPRO_FENCE bloat
CONFIG_X86_PPRO_FENCE bloats text: i386 allmodconf: size mm/built-in.o text data bss dec hex text ratio vanilla: 163082 20372 40120 223574 36956 100.00% bugfix : 163509 20372 40120 224001 36b01 0.26% noppro : 162191 20372 40120 222683 365db - 0.55% both : 162267 20372 40120 222759 36627 - 0.50% (+0.05% vs noppro) So with the ppro memory ordering bug out of the way, the PG_uptodate fix only adds 76 bytes of text. allow this config to be specified by distros. [ mingo@elte.hu: x86.git merge ] Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--arch/x86/Kconfig.cpu11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 018d68e3184e..e09a6b73a1aa 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -321,8 +321,17 @@ config X86_XADD
321 depends on X86_32 && !M386 321 depends on X86_32 && !M386
322 322
323config X86_PPRO_FENCE 323config X86_PPRO_FENCE
324 def_bool y 324 bool "PentiumPro memory ordering errata workaround"
325 depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1 325 depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
326 help
327 Old PentiumPro multiprocessor systems had errata that could cause memory
328 operations to violate the x86 ordering standard in rare cases. Enabling this
329 option will attempt to work around some (but not all) occurances of
330 this problem, at the cost of much heavier spinlock and memory barrier
331 operations.
332
333 If unsure, say n here. Even distro kernels should think twice before enabling
334 this: there are few systems, and an unlikely bug.
326 335
327config X86_F00F_BUG 336config X86_F00F_BUG
328 def_bool y 337 def_bool y