Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fb0328e2e6407d6f48a608aefa62b2be91989e7e
Commit:     fb0328e2e6407d6f48a608aefa62b2be91989e7e
Parent:     583d0e90ea52f02ae4d103359ee59e8218799e27
Author:     Nick Piggin <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:32:31 2008 +0100
Committer:  Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:32:31 2008 +0100

    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.
    
    [ [EMAIL PROTECTED]: x86.git merge ]
    
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
 arch/x86/Kconfig.cpu |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 018d68e..e09a6b7 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -321,8 +321,17 @@ config X86_XADD
        depends on X86_32 && !M386
 
 config X86_PPRO_FENCE
-       def_bool y
+       bool "PentiumPro memory ordering errata workaround"
        depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || 
MGEODEGX1
+       help
+         Old PentiumPro multiprocessor systems had errata that could cause 
memory
+         operations to violate the x86 ordering standard in rare cases. 
Enabling this
+         option will attempt to work around some (but not all) occurances of
+         this problem, at the cost of much heavier spinlock and memory barrier
+         operations.
+
+         If unsure, say n here. Even distro kernels should think twice before 
enabling
+         this: there are few systems, and an unlikely bug.
 
 config X86_F00F_BUG
        def_bool y
-
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