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| author | Weijie Yang <weijie.yang@samsung.com> | 2014-10-24 17:00:34 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-10-28 07:36:50 +0100 |
| commit | 3c325f8233c35fb35dec3744ba01634aab4ea36a (patch) | |
| tree | 74acadb935be56eda762d0e41f7c029303d6980e /arch/x86 | |
| parent | 26c2d2b39128adba276d140eefa2745591b88536 (diff) | |
| download | linux-3c325f8233c35fb35dec3744ba01634aab4ea36a.tar.gz | |
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')
| -rw-r--r-- | arch/x86/kernel/setup.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 235cfd39e0d7..ab08aa2276fb 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1128,7 +1128,6 @@ void __init setup_arch(char **cmdline_p) setup_real_mode(); memblock_set_current_limit(get_max_mapped()); - dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT); /* * NOTE: On x86-32, only from this point on, fixmaps are ready for use. @@ -1159,6 +1158,7 @@ void __init setup_arch(char **cmdline_p) early_acpi_boot_init(); initmem_init(); + dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT); /* * Reserve memory for crash kernel after SRAT is parsed so that it |