From: Omar Sandoval <osandov@xxxxxx> Hi, This series makes a few improvements to /proc/kcore. It fixes a couple of small issues in v3 but is otherwise the same. 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 makes it possible to enable CRASH_CORE on any architecture, which is needed for patch 9. Patch 9 adds vmcoreinfo to /proc/kcore. Based on v4.18-rc6 + James' patch in the mm tree, and tested with crash and readelf. Thanks! Changes from v3: - Fixes a mixed up up_write() instead of up_read() in patch 5 reported by Tetsuo Handa - Added patch 8 to fix a build failure reported by Stephen Rothwell 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 (https://patchwork.kernel.org/patch/10519739/) in the mm tree - Fix spurious sparse warning (see the report and response in https://patchwork.kernel.org/patch/10512431/) Omar Sandoval (9): 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 crash_core: use VMCOREINFO_SYMBOL_ARRAY() for swapper_pg_dir 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 | 6 +- 5 files changed, 252 insertions(+), 293 deletions(-) -- 2.18.0
