The patch titled
Subject: mm: nommu: correct the range of mmap_sem_read_lock in task_mem()
has been added to the -mm mm-unstable branch. Its filename is
mm-nommu-correct-the-range-of-mmap_sem_read_lock-in-task_mem.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-nommu-correct-the-range-of-mmap_sem_read_lock-in-task_mem.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: lipeifeng <lipeifeng@xxxxxxxx>
Subject: mm: nommu: correct the range of mmap_sem_read_lock in task_mem()
Date: Thu, 22 Jun 2023 12:01:52 +0800
During the seq_printf,the mmap_sem_read_lock protection is not
required.
Link: https://lkml.kernel.org/r/20230622040152.1173-1-lipeifeng@xxxxxxxx
Signed-off-by: lipeifeng <lipeifeng@xxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/task_nommu.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/fs/proc/task_nommu.c~mm-nommu-correct-the-range-of-mmap_sem_read_lock-in-task_mem
+++ a/fs/proc/task_nommu.c
@@ -51,7 +51,7 @@ void task_mem(struct seq_file *m, struct
sbytes += kobjsize(mm);
else
bytes += kobjsize(mm);
-
+
if (current->fs && current->fs->users > 1)
sbytes += kobjsize(current->fs);
else
@@ -69,13 +69,13 @@ void task_mem(struct seq_file *m, struct
bytes += kobjsize(current); /* includes kernel stack */
+ mmap_read_unlock(mm);
+
seq_printf(m,
"Mem:\t%8lu bytes\n"
"Slack:\t%8lu bytes\n"
"Shared:\t%8lu bytes\n",
bytes, slack, sbytes);
-
- mmap_read_unlock(mm);
}
unsigned long task_vsize(struct mm_struct *mm)
_
Patches currently in -mm which might be from lipeifeng@xxxxxxxx are
mm-nommu-correct-the-range-of-mmap_sem_read_lock-in-task_mem.patch
