A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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mm: rcu-protected get_mm_exe_file()

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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.

[[email protected]: fix comment typo]
Signed-off-by: Konstantin Khlebnikov <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Konstantin Khlebnikov 2015-04-16 12:47:56 -07:00 • committed by Linus Torvalds
commit 90f31d0ea8
4 changed files with 40 additions and 22 deletions
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3
fs/file.c
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@ -638,8 +638,7 @@ static struct file *__fget(unsigned int fd, fmode_t mask)
file = fcheck_files(files, fd);
if (file) {
/* File object ref couldn't be taken */
if ((file->f_mode & mask) ||
!atomic_long_inc_not_zero(&file->f_count))
if ((file->f_mode & mask) || !get_file_rcu(file))
file = NULL;
}
rcu_read_unlock();