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authorLinus Torvalds <torvalds@linux-foundation.org>2010-02-28 10:38:45 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-02-28 10:38:45 -0800
commit46bbffad54bd48bb809f2691c1970a79a588976b (patch)
tree21779a574f118b1cba5d6832bc0a0fa3bee97075 /kernel/resource.c
parent85fe20bfd415af0a2e93bd1166533d4a6eb591ea (diff)
parentc1fd1b43831fa20c91cdd461342af8edf2e87c2f (diff)
Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, mm: Unify kernel_physical_mapping_init() API x86, mm: Allow highmem user page tables to be disabled at boot time x86: Do not reserve brk for DMI if it's not going to be used x86: Convert tlbstate_lock to raw_spinlock x86: Use the generic page_is_ram() x86: Remove BIOS data range from e820 Move page_is_ram() declaration to mm.h Generic page_is_ram: use __weak resources: introduce generic page_is_ram()
Diffstat (limited to 'kernel/resource.c')
-rw-r--r--kernel/resource.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/resource.c b/kernel/resource.c
index 24e9e60c145..4e9d87fd7bc 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -327,6 +327,19 @@ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
#endif
+static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg)
+{
+ return 1;
+}
+/*
+ * This generic page_is_ram() returns true if specified address is
+ * registered as "System RAM" in iomem_resource list.
+ */
+int __weak page_is_ram(unsigned long pfn)
+{
+ return walk_system_ram_range(pfn, 1, NULL, __is_ram) == 1;
+}
+
/*
* Find empty slot in the resource tree given range and alignment.
*/