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x86: don't use P6_NOPs if compiling with CONFIG_X86_GENERIC 

P6_NOPs are definitely not supported on some VIA CPUs, and possibly
(unverified) on AMD K7s.  It is also the only thing that prevents a
686 kernel from running on Transmeta TM3x00/5x00 (Crusoe) series.

The performance benefit over generic NOPs is very small, so when
building for generic consumption, avoid using them.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
H. Peter Anvin 2008-02-14 14:56:45 -08:00 committed by Ingo Molnar
parent 7343b3b3a6
commit 959b3be64c
1 changed files with 10 additions and 1 deletions
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11
arch/x86/Kconfig.cpu
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@ -377,9 +377,18 @@ config X86_OOSTORE
def_bool y
depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR
#
# P6_NOPs are a relatively minor optimization that require a family >=
# 6 processor, except that it is broken on certain VIA chips.
# Furthermore, AMD chips prefer a totally different sequence of NOPs
# (which work on all CPUs). As a result, disallow these if we're
# compiling X86_GENERIC but not X86_64 (these NOPs do work on all
# x86-64 capable chips); the list of processors in the right-hand clause
# are the cores that benefit from this optimization.
#
config X86_P6_NOP
def_bool y
depends on (M686 || MPENTIUMII || MPENTIUMIII || MPENTIUMM || MCORE2 || PENTIUM4)
depends on (X86_64 || !X86_GENERIC) && (M686 || MPENTIUMII || MPENTIUMIII || MPENTIUMM || MCORE2 || PENTIUM4)
config X86_TSC
def_bool y