Commit-ID: 3f1ac1cdc4fdf894e35c0e4fd103b54eec8a28c0
Gitweb: http://git.kernel.org/tip/3f1ac1cdc4fdf894e35c0e4fd103b54eec8a28c0
Author: Dave Jones <davej@xxxxxxxxxxxxxxxxx>
AuthorDate: Mon, 11 Jan 2016 12:04:28 -0500
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Tue, 12 Jan 2016 11:04:53 +0100
x86/mm: Make split_page_count check for empty levels
In PAGEALLOC_DEBUG builds, we disable the 2M pages. Unfortunatly when we
split up mappings during boot, split_page_count doesn't take this into
account, and starts decrementing an empty direct_pages_count level.
This results in /proc/meminfo showing crazy things like
DirectMap2M: 18446744073709543424 kB
Signed-off-by: Dave Jones <davej@xxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20160111170428.GA8547@xxxxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
arch/x86/mm/pageattr.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index a3137a4..ff0e0c6 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -66,6 +66,9 @@ void update_page_count(int level, unsigned long pages)
static void split_page_count(int level)
{
+ if (direct_pages_count[level] == 0)
+ return;
+
direct_pages_count[level]--;
direct_pages_count[level - 1] += PTRS_PER_PTE;
}
--
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