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| author | Max Filippov <jcmvbkbc@gmail.com> | 2014-10-04 03:46:34 +0400 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2014-10-21 13:28:57 +0400 |
| commit | 566fb58ed422537715023d1f19b705247a640b11 (patch) | |
| tree | 9051c7de2de61b18e0cceb1f63a81e094b5d6f1a /arch/xtensa/mm | |
| parent | 2eabc1800d1ef7a850672aedcc266a831572af63 (diff) | |
| download | lwn-566fb58ed422537715023d1f19b705247a640b11.tar.gz lwn-566fb58ed422537715023d1f19b705247a640b11.zip | |
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>
Diffstat (limited to 'arch/xtensa/mm')
| -rw-r--r-- | arch/xtensa/mm/init.c | 11 |
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; |