The patch titled
Subject: fs/exec.c: move ->recursion_depth out of critical sections
has been added to the -mm tree. Its filename is
exec-move-recursion_depth-out-of-critical-sections.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/exec-move-recursion_depth-out-of-critical-sections.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/exec-move-recursion_depth-out-of-critical-sections.patch
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------------------------------------------------------
From: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Subject: fs/exec.c: move ->recursion_depth out of critical sections
->recursion_depth is changed only by current, therefore decrementing can
be done without taking any locks.
Link: http://lkml.kernel.org/r/20190417213150.GA26474@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/exec.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/fs/exec.c~exec-move-recursion_depth-out-of-critical-sections
+++ a/fs/exec.c
@@ -1652,11 +1652,13 @@ int search_binary_handler(struct linux_b
if (!try_module_get(fmt->module))
continue;
read_unlock(&binfmt_lock);
+
bprm->recursion_depth++;
retval = fmt->load_binary(bprm);
+ bprm->recursion_depth--;
+
read_lock(&binfmt_lock);
put_binfmt(fmt);
- bprm->recursion_depth--;
if (retval < 0 && !bprm->mm) {
/* we got to flush_old_exec() and failed after it */
read_unlock(&binfmt_lock);
_
Patches currently in -mm which might be from adobriyan@xxxxxxxxx are
proc-fix-map_files-test-on-f29.patch
proc-fixup-proc-pid-vm-test.patch
ramfs-support-o_tmpfile.patch
elf-make-scope-of-pos-variable-smaller.patch
elf-free-pt_interp-filename-asap.patch
elf-delete-trailing-return-in-functions-returning-void.patch
elf-save-1-indent-level.patch
elf-move-variables-initialization-closer-to-their-usage.patch
exec-move-recursion_depth-out-of-critical-sections.patch
