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Commit 2d4b95f0 authored by Hugh Dickins's avatar Hugh Dickins Committed by Linus Torvalds
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[PATCH] Suppress split ptlock on arches which may use one page for multiple page tables 



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: default avatarHugh Dickins <hugh@veritas.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 732ee21f

mm/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -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"