diff options
| author | Weijie Yang <weijie.yang@samsung.com> | 2014-10-24 13:00:34 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-10-28 09:36:50 +0300 |
| commit | 3c325f8233c35fb35dec3744ba01634aab4ea36a (patch) | |
| tree | 74acadb935be56eda762d0e41f7c029303d6980e /arch/x86/kernel/irqinit.c | |
| parent | 26c2d2b39128adba276d140eefa2745591b88536 (diff) | |
| download | linux-3c325f8233c35fb35dec3744ba01634aab4ea36a.tar.xz | |
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 <fengguang.wu@intel.com>
Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Cc: iamjoonsoo.kim@lge.com
Cc: 'Linux-MM' <linux-mm@kvack.org>
Cc: 'Weijie Yang' <weijie.yang.kh@gmail.com>
Link: http://lkml.kernel.org/r/000101cfef69%2431e528a0%2495af79e0%24%25yang@samsung.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/irqinit.c')
0 files changed, 0 insertions, 0 deletions