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 evict_inode function. Which might lead into deadlock. For further details http://marc.info/?l=linux-mm&m=128942194520631&w=4 https://bugzilla.kernel.org/show_bug.cgi?id=30702 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 | 11 +++++- 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 | 20 +++++++++-- 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 | 13 +++++-- 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 | 21 ++++++++--- arch/powerpc/include/asm/pgalloc-32.h | 2 + arch/powerpc/include/asm/pgalloc-64.h | 27 +++++++++++--- arch/powerpc/mm/pgtable_32.c | 10 ++++- arch/s390/include/asm/pgalloc.h | 30 +++++++++++++--- arch/s390/mm/pgtable.c | 22 +++++++++--- arch/score/include/asm/pgalloc.h | 13 ++++--- 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 | 13 ++++++- 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 | 8 ++++- arch/xtensa/include/asm/pgalloc.h | 9 ++++- arch/xtensa/mm/pgtable.c | 11 +++++- 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 | 57 ++++++++++++++++++++---------- 42 files changed, 441 insertions(+), 123 deletions(-)
