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authorMax Filippov <jcmvbkbc@gmail.com>2014-10-04 03:46:34 +0400
committerMax Filippov <jcmvbkbc@gmail.com>2014-10-21 13:28:57 +0400
commit566fb58ed422537715023d1f19b705247a640b11 (patch)
tree9051c7de2de61b18e0cceb1f63a81e094b5d6f1a
parent2eabc1800d1ef7a850672aedcc266a831572af63 (diff)
downloadlinux-566fb58ed422537715023d1f19b705247a640b11.tar.xz
xtensa: nommu: reserve memory below PLATFORM_DEFAULT_MEM_START
Memory accounting code can't handle pages below PLATFORM_DEFAULT_MEM_START. Reserve those pages if they exist. When PLATFORM_DEFAULT_MEM_START is zero reserve one page at address 0 to make sure that successfull memory allocations don't return NULL. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
-rw-r--r--arch/xtensa/mm/init.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index 77ed20209ca5..5a084fa5b608 100644
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -239,6 +239,17 @@ void __init bootmem_init(void)
unsigned long bootmap_start, bootmap_size;
int i;
+ /* Reserve all memory below PLATFORM_DEFAULT_MEM_START, as memory
+ * accounting doesn't work for pages below that address.
+ *
+ * If PLATFORM_DEFAULT_MEM_START is zero reserve page at address 0:
+ * successfull allocations should never return NULL.
+ */
+ if (PLATFORM_DEFAULT_MEM_START)
+ mem_reserve(0, PLATFORM_DEFAULT_MEM_START, 0);
+ else
+ mem_reserve(0, 1, 0);
+
sysmem_dump();
max_low_pfn = max_pfn = 0;
min_low_pfn = ~0;