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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2014-04-07 15:37:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-07 16:35:52 -0700
commit9164550ecd15253d72b5fe3b4baa9505c4b6fa1f (patch)
tree3f4c795c46a3046ce61fdc1a47a96e60427023c0
parentab0e113f6bee71a3933755d2c9ae41fcee631800 (diff)
mm: disable split page table lock for !MMU
There's no reason to enable split page table lock if don't have page tables. It also triggers build error at least on ARM since we don't define pmd_page() for !MMU. In file included from arch/arm/kernel/asm-offsets.c:14:0: include/linux/mm.h: In function 'pte_lockptr': include/linux/mm.h:1392:2: error: implicit declaration of function 'pmd_page' [-Werror=implicit-function-declaration] include/linux/mm.h:1392:2: warning: passing argument 1 of 'ptlock_ptr' makes pointer from integer without a cast [enabled by default] include/linux/mm.h:1384:27: note: expected 'struct page *' but argument is of type 'int' Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 2888024e0b0a..37fbe1ef5239 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -216,6 +216,7 @@ config PAGEFLAGS_EXTENDED
#
config SPLIT_PTLOCK_CPUS
int
+ default "999999" if !MMU
default "999999" if ARM && !CPU_CACHE_VIPT
default "999999" if PARISC && !PA20
default "4"