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Subject[PATCH v3 0/8] /proc/kcore improvements
From: Omar Sandoval <>


This series makes a few improvements to /proc/kcore. Patches 1, 2, and 3
are prep patches. Patch 4 is a fix/cleanup. Patch 5 is another prep
patch. Patches 6 and 7 are optimizations to ->read(). Patch 8 adds
vmcoreinfo to /proc/kcore.

Again, based on v4.18-rc4 + James' patch in the mm tree, and tested with
crash and readelf.


Changes from v2:

- Add __init to kclist_add() as per Andrew
- Got rid of conversion of kcore_need_update from int to atomic_t and
just used xchg() instead of atomic_cmpxchg() (split out into a new
patch instead of combining it with the rwlock -> rwsem conversion)
- Add comment about the increase in file size to patch 8

Changes from v1:

- Rebased onto v4.18-rc4 + James' patch
( in the mm tree
- Fix spurious sparse warning (see the report and response in

Omar Sandoval (8):
proc/kcore: don't grab lock for kclist_add()
proc/kcore: don't grab lock for memory hotplug notifier
proc/kcore: replace kclist_lock rwlock with rwsem
proc/kcore: fix memory hotplug vs multiple opens race
proc/kcore: hold lock during read
proc/kcore: clean up ELF header generation
proc/kcore: optimize multiple page reads
proc/kcore: add vmcoreinfo note to /proc/kcore

fs/proc/Kconfig | 1 +
fs/proc/kcore.c | 534 +++++++++++++++++--------------------
include/linux/crash_core.h | 2 +
include/linux/kcore.h | 2 +-
kernel/crash_core.c | 4 +-
5 files changed, 251 insertions(+), 292 deletions(-)


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