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[PATCH] Suppress split ptlock on arches which may use one page for multiple page tables

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Suppress split ptlock on arches which may use one page for multiple page
tables.  Reconsider what better to do (particularly on ppc64) later on.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins 2005-11-07 00:57:57 -08:00 committed by Linus Torvalds
parent 732ee21f28
commit 2d4b95f060
1 changed files with 2 additions and 0 deletions
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mm/Kconfig
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@ -126,9 +126,11 @@ comment "Memory hotplug is currently incompatible with Software Suspend"
# Default to 4 for wider testing, though 8 might be more appropriate.
# ARM's adjust_pte (unused if VIPT) depends on mm-wide page_table_lock.
# PA-RISC's debug spinlock_t is too large for the 32-bit struct page.
# ARM26 and SPARC32 and PPC64 may use one page for multiple page tables.
#
config SPLIT_PTLOCK_CPUS
int
default "4096" if ARM && !CPU_CACHE_VIPT
default "4096" if PARISC && DEBUG_SPINLOCK && !64BIT
default "4096" if ARM26 || SPARC32 || PPC64
default "4"