The patch titled
coredump: turn core_state->nr_threads into atomic_t
has been removed from the -mm tree. Its filename was
coredump-turn-core_state-nr_threads-into-atomic_t.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: coredump: turn core_state->nr_threads into atomic_t
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Turn core_state->nr_threads into atomic_t and kill now unneeded
down_write(&mm->mmap_sem) in exit_mm().
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/exec.c | 2 +-
include/linux/mm_types.h | 2 +-
kernel/exit.c | 5 ++---
3 files changed, 4 insertions(+), 5 deletions(-)
diff -puN fs/exec.c~coredump-turn-core_state-nr_threads-into-atomic_t fs/exec.c
--- a/fs/exec.c~coredump-turn-core_state-nr_threads-into-atomic_t
+++ a/fs/exec.c
@@ -1591,7 +1591,7 @@ static inline int zap_threads(struct tas
}
rcu_read_unlock();
done:
- core_state->nr_threads = nr;
+ atomic_set(&core_state->nr_threads, nr);
return nr;
}
diff -puN include/linux/mm_types.h~coredump-turn-core_state-nr_threads-into-atomic_t include/linux/mm_types.h
--- a/include/linux/mm_types.h~coredump-turn-core_state-nr_threads-into-atomic_t
+++ a/include/linux/mm_types.h
@@ -160,7 +160,7 @@ struct vm_area_struct {
};
struct core_state {
- int nr_threads;
+ atomic_t nr_threads;
struct completion startup;
};
diff -puN kernel/exit.c~coredump-turn-core_state-nr_threads-into-atomic_t kernel/exit.c
--- a/kernel/exit.c~coredump-turn-core_state-nr_threads-into-atomic_t
+++ a/kernel/exit.c
@@ -678,10 +678,9 @@ static void exit_mm(struct task_struct *
down_read(&mm->mmap_sem);
if (mm->core_state) {
up_read(&mm->mmap_sem);
- down_write(&mm->mmap_sem);
- if (!--mm->core_state->nr_threads)
+
+ if (atomic_dec_and_test(&mm->core_state->nr_threads))
complete(&mm->core_state->startup);
- up_write(&mm->mmap_sem);
wait_for_completion(&mm->core_done);
down_read(&mm->mmap_sem);
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
linux-next.patch
migrate_timers-add-comment-use-spinlock_irq.patch
tracehook-add-linux-tracehookh.patch
tracehook-exec.patch
tracehook-unexport-ptrace_notify.patch
tracehook-exit.patch
tracehook-clone.patch
tracehook-vfork-done.patch
tracehook-release_task.patch
tracehook-tracehook_tracer_task.patch
tracehook-tracehook_expect_breakpoints.patch
tracehook-tracehook_signal_handler.patch
tracehook-tracehook_consider_ignored_signal.patch
tracehook-tracehook_consider_fatal_signal.patch
tracehook-syscall.patch
tracehook-get_signal_to_deliver.patch
tracehook-job-control.patch
tracehook-death.patch
tracehook-force-signal_pending.patch
tracehook-tif_notify_resume.patch
tracehook-asm-syscallh.patch
tracehook-config_have_arch_tracehook.patch
tracehook-wait_task_inactive.patch
task_current_syscall.patch
proc-pid-syscall.patch
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