diff options
| author | Weijie Yang <[email protected]> | 2014-10-24 17:00:34 +0800 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2014-10-28 07:36:50 +0100 |
| commit | 3c325f8233c35fb35dec3744ba01634aab4ea36a (patch) | |
| tree | 74acadb935be56eda762d0e41f7c029303d6980e /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 26c2d2b39128adba276d140eefa2745591b88536 (diff) | |
x86, cma: Reserve DMA contiguous area after initmem_init()
Fengguang Wu reported a boot crash on the x86 platform
via the 0-day Linux Kernel Performance Test:
cma: dma_contiguous_reserve: reserving 31 MiB for global area
BUG: Int 6: CR2 (null)
[<41850786>] dump_stack+0x16/0x18
[<41d2b1db>] early_idt_handler+0x6b/0x6b
[<41072227>] ? __phys_addr+0x2e/0xca
[<41d4ee4d>] cma_declare_contiguous+0x3c/0x2d7
[<41d6d359>] dma_contiguous_reserve_area+0x27/0x47
[<41d6d4d1>] dma_contiguous_reserve+0x158/0x163
[<41d33e0f>] setup_arch+0x79b/0xc68
[<41d2b7cf>] start_kernel+0x9c/0x456
[<41d2b2ca>] i386_start_kernel+0x79/0x7d
(See details at: https://lkml.org/lkml/2014/10/8/708)
It is because dma_contiguous_reserve() is called before
initmem_init() in x86, the variable high_memory is not
initialized but accessed by __pa(high_memory) in
dma_contiguous_reserve().
This patch moves dma_contiguous_reserve() after initmem_init()
so that high_memory is initialized before accessed.
Reported-by: Fengguang Wu <[email protected]>
Signed-off-by: Weijie Yang <[email protected]>
Acked-by: Andrew Morton <[email protected]>
Acked-by: Marek Szyprowski <[email protected]>
Acked-by: Michal Nazarewicz <[email protected]>
Cc: [email protected]
Cc: 'Linux-MM' <[email protected]>
Cc: 'Weijie Yang' <[email protected]>
Link: http://lkml.kernel.org/r/000101cfef69%2431e528a0%2495af79e0%24%[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions