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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2015-04-16 12:47:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-17 09:04:07 -0400
commit90f31d0ea88880f780574f3d0bb1a227c4c66ca3 (patch)
tree5367f83919939a2d83888b3a1c48e5ba06e0f574 /include
parent0ec62afeb143a34ce78143cf442f879ef68382f7 (diff)
downloadlinux-90f31d0ea88880f780574f3d0bb1a227c4c66ca3.tar.bz2
mm: rcu-protected get_mm_exe_file()
This patch removes mm->mmap_sem from mm->exe_file read side. Also it kills dup_mm_exe_file() and moves exe_file duplication into dup_mmap() where both mmap_sems are locked. [akpm@linux-foundation.org: fix comment typo] Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Oleg Nesterov <oleg@redhat.com> Cc: "Paul E. McKenney" <paulmck@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/fs.h1
-rw-r--r--include/linux/mm_types.h2
2 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index f4fc60727b8d..6bf7ab7c1573 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -870,6 +870,7 @@ static inline struct file *get_file(struct file *f)
atomic_long_inc(&f->f_count);
return f;
}
+#define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count)
#define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
#define file_count(x) atomic_long_read(&(x)->f_count)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 590630eb59ba..8d37e26a1007 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -429,7 +429,7 @@ struct mm_struct {
#endif
/* store ref to file /proc/<pid>/exe symlink points to */
- struct file *exe_file;
+ struct file __rcu *exe_file;
#ifdef CONFIG_MMU_NOTIFIER
struct mmu_notifier_mm *mmu_notifier_mm;
#endif