On IRC, Russell King noticed that the code in arch/x86/mm/fault.c
looked buggy with the retry loop and retaking the mmap_sem. But
with further investigation it seems to be correct, but now
handle_mm_fault() has subtle locking with the mmap_sem depending
on what flags are set.
Unfortunately, there's no good comments about what is going on in the
code. Doing various git blame, git show, I dug up the history
and cleaned up the RETRY_NOWAIT and added documentation to the
handle_mm_fault().
Steven Rostedt (2):
mm: Remove use of ALLOW_RETRY when RETRY_NOWAIT is set
mm: Document handle_mm_fault()
----
include/linux/mm.h | 4 ++--
mm/filemap.c | 14 +++++++-------
mm/memory.c | 24 +++++++++++++++++++++---
3 files changed, 30 insertions(+), 12 deletions(-)
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