Commit-ID: f15e05186c3244e9195378a0a568283a8ccc60b0 Gitweb: http://git.kernel.org/tip/f15e05186c3244e9195378a0a568283a8ccc60b0 Author: Dave Hansen <dave.han...@linux.intel.com> AuthorDate: Tue, 10 Feb 2015 13:20:30 -0800 Committer: Borislav Petkov <b...@suse.de> CommitDate: Thu, 19 Feb 2015 11:45:27 +0100
x86/mm/init: Fix incorrect page size in init_memory_mapping() printks With 32-bit non-PAE kernels, we have 2 page sizes available (at most): 4k and 4M. Enabling PAE replaces that 4M size with a 2M one (which 64-bit systems use too). But, when booting a 32-bit non-PAE kernel, in one of our early-boot printouts, we say: init_memory_mapping: [mem 0x00000000-0x000fffff] [mem 0x00000000-0x000fffff] page 4k init_memory_mapping: [mem 0x37000000-0x373fffff] [mem 0x37000000-0x373fffff] page 2M init_memory_mapping: [mem 0x00100000-0x36ffffff] [mem 0x00100000-0x003fffff] page 4k [mem 0x00400000-0x36ffffff] page 2M init_memory_mapping: [mem 0x37400000-0x377fdfff] [mem 0x37400000-0x377fdfff] page 4k Which is obviously wrong. There is no 2M page available. This is probably because of a badly-named variable: in the map_range code: PG_LEVEL_2M. Instead of renaming all the PG_LEVEL_2M's. This patch just fixes the printout: init_memory_mapping: [mem 0x00000000-0x000fffff] [mem 0x00000000-0x000fffff] page 4k init_memory_mapping: [mem 0x37000000-0x373fffff] [mem 0x37000000-0x373fffff] page 4M init_memory_mapping: [mem 0x00100000-0x36ffffff] [mem 0x00100000-0x003fffff] page 4k [mem 0x00400000-0x36ffffff] page 4M init_memory_mapping: [mem 0x37400000-0x377fdfff] [mem 0x37400000-0x377fdfff] page 4k BRK [0x03206000, 0x03206fff] PGTABLE Signed-off-by: Dave Hansen <dave.han...@linux.intel.com> Cc: Pekka Enberg <penb...@cs.helsinki.fi> Cc: Yinghai Lu <ying...@kernel.org> Link: http://lkml.kernel.org/r/20150210212030.665ec...@viggo.jf.intel.com Signed-off-by: Borislav Petkov <b...@suse.de> --- arch/x86/mm/init.c | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 079c3b6..7ff2424 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -238,6 +238,31 @@ static void __init_refok adjust_range_page_size_mask(struct map_range *mr, } } +static const char *page_size_string(struct map_range *mr) +{ + static const char str_1g[] = "1G"; + static const char str_2m[] = "2M"; + static const char str_4m[] = "4M"; + static const char str_4k[] = "4k"; + + if (mr->page_size_mask & (1<<PG_LEVEL_1G)) + return str_1g; + /* + * 32-bit without PAE has a 4M large page size. + * PG_LEVEL_2M is misnamed, but we can at least + * print out the right size in the string. + */ + if (IS_ENABLED(CONFIG_X86_32) && + !IS_ENABLED(CONFIG_X86_PAE) && + mr->page_size_mask & (1<<PG_LEVEL_2M)) + return str_4m; + + if (mr->page_size_mask & (1<<PG_LEVEL_2M)) + return str_2m; + + return str_4k; +} + static int __meminit split_mem_range(struct map_range *mr, int nr_range, unsigned long start, unsigned long end) @@ -333,8 +358,7 @@ static int __meminit split_mem_range(struct map_range *mr, int nr_range, for (i = 0; i < nr_range; i++) printk(KERN_DEBUG " [mem %#010lx-%#010lx] page %s\n", mr[i].start, mr[i].end - 1, - (mr[i].page_size_mask & (1<<PG_LEVEL_1G))?"1G":( - (mr[i].page_size_mask & (1<<PG_LEVEL_2M))?"2M":"4k")); + page_size_string(&mr[i])); return nr_range; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
