A filesystem might run into a problem while calling __vmalloc(GFP_NOFS) inside a lock. It is expected than __vmalloc when called with GFP_NOFS should not callback the filesystem code even incase of the increased memory pressure. But the problem is that even if we pass this flag, __vmalloc itself allocates memory with GFP_KERNEL. Using GFP_KERNEL allocations may go into the memory reclaim path and try to free memory by calling file system clear_inode/evict_inode function. Which might lead into deadlock. For further details https://bugzilla.kernel.org/show_bug.cgi?id=30702 http://marc.info/?l=linux-mm&m=128942194520631&w=4 The patch passes the gfp allocation flag all the way down to those allocating functions. arch/alpha/include/asm/pgalloc.h | 18 ++------- arch/arm/include/asm/pgalloc.h | 12 +----- arch/avr32/include/asm/pgalloc.h | 8 +---- arch/cris/include/asm/pgalloc.h | 10 +---- arch/frv/include/asm/pgalloc.h | 3 -- arch/frv/include/asm/pgtable.h | 1 - arch/frv/mm/pgalloc.c | 9 +---- arch/ia64/include/asm/pgalloc.h | 24 ++----------- arch/m32r/include/asm/pgalloc.h | 11 ++---- arch/m68k/include/asm/motorola_pgalloc.h | 19 ++-------- arch/m68k/include/asm/sun3_pgalloc.h | 14 ++------ arch/m68k/mm/memory.c | 9 +---- arch/microblaze/include/asm/pgalloc.h | 3 -- arch/microblaze/mm/pgtable.c | 12 ++----- arch/mips/include/asm/pgalloc.h | 22 ++++-------- arch/mn10300/include/asm/pgalloc.h | 2 - arch/mn10300/mm/pgtable.c | 10 +---- arch/parisc/include/asm/pgalloc.h | 20 ++-------- arch/powerpc/include/asm/pgalloc-32.h | 2 - arch/powerpc/include/asm/pgalloc-64.h | 29 +++------------ arch/powerpc/mm/pgtable_32.c | 10 +---- arch/s390/include/asm/pgalloc.h | 28 +++------------ arch/s390/mm/pgtable.c | 22 +++--------- arch/score/include/asm/pgalloc.h | 14 +++---- arch/sh/include/asm/pgalloc.h | 8 +---- arch/sh/mm/pgtable.c | 8 +---- arch/sparc/include/asm/pgalloc_32.h | 5 --- arch/sparc/include/asm/pgalloc_64.h | 17 +-------- arch/tile/include/asm/pgalloc.h | 11 +----- arch/tile/mm/pgtable.c | 10 +---- arch/um/include/asm/pgalloc.h | 1 - arch/um/kernel/mem.c | 21 +++-------- arch/x86/include/asm/pgalloc.h | 17 +-------- arch/x86/mm/pgtable.c | 9 +---- arch/xtensa/include/asm/pgalloc.h | 9 +---- arch/xtensa/mm/pgtable.c | 10 +---- include/asm-generic/4level-fixup.h | 8 +--- include/asm-generic/pgtable-nopmd.h | 3 +- include/asm-generic/pgtable-nopud.h | 1 - include/linux/mm.h | 40 +++++--------------- mm/memory.c | 14 +++---- mm/vmalloc.c | 58 ++++++++++-------------------- 42 files changed, 121 insertions(+), 441 deletions(-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>