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Subject[RFC][PATCH v3 00/22] __vmalloc: Propagating GFP allocation flag inside __vmalloc()
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/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 ++++++++++++++++++++----------
41 files changed, 427 insertions(+), 119 deletions(-)



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