Subject: + ipc-update-locking-scheme-comments-fix.patch added to -mm tree
To: akpm@xxxxxxxxxxxxxxxxxxxx,davidlohr@xxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 03 Oct 2013 12:40:03 -0700
The patch titled
Subject: ipc-update-locking-scheme-comments-fix
has been added to the -mm tree. Its filename is
ipc-update-locking-scheme-comments-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ipc-update-locking-scheme-comments-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ipc-update-locking-scheme-comments-fix.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: ipc-update-locking-scheme-comments-fix
make it more readable in 80 columns
Cc: Davidlohr Bueso <davidlohr@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
ipc/util.c | 30 ++++++++++++++++++------------
1 file changed, 18 insertions(+), 12 deletions(-)
diff -puN ipc/util.c~ipc-update-locking-scheme-comments-fix ipc/util.c
--- a/ipc/util.c~ipc-update-locking-scheme-comments-fix
+++ a/ipc/util.c
@@ -17,21 +17,27 @@
* Pavel Emelianov <xemul@xxxxxxxxxx>
*
* General sysv ipc locking scheme:
- * rcu_read_lock()
- * obtain the ipc object (kern_ipc_perm) by looking up the id in an idr tree.
- * - perform initial checks (capabilities, auditing and permission, etc).
- * - perform read-only operations, such as STAT, INFO commands.
- * acquire the ipc lock (kern_ipc_perm.lock) through ipc_lock_object()
- * - perform data updates, such as SET, RMID commands and
- * mechanism-specific operations (semop/semtimedop, msgsnd/msgrcv, shmat/shmdt).
- * drop the ipc lock, through ipc_unlock_object().
- * rcu_read_unlock()
+ * rcu_read_lock()
+ * obtain the ipc object (kern_ipc_perm) by looking up the id in an idr
+ * tree.
+ * - perform initial checks (capabilities, auditing and permission,
+ * etc).
+ * - perform read-only operations, such as STAT, INFO commands.
+ * acquire the ipc lock (kern_ipc_perm.lock) through
+ * ipc_lock_object()
+ * - perform data updates, such as SET, RMID commands and
+ * mechanism-specific operations (semop/semtimedop,
+ * msgsnd/msgrcv, shmat/shmdt).
+ * drop the ipc lock, through ipc_unlock_object().
+ * rcu_read_unlock()
*
* The ids->rwsem must be taken when:
- * - creating, removing and iterating the existing entries in ipc identifier sets.
- * - iterating through /proc/sysvipc/* files.
+ * - creating, removing and iterating the existing entries in ipc
+ * identifier sets.
+ * - iterating through /proc/sysvipc/* files.
*
- * Note that sems have a special fast path that avoids kern_ipc_perm.lock - see sem_lock().
+ * Note that sems have a special fast path that avoids kern_ipc_perm.lock -
+ * see sem_lock().
*/
#include <linux/mm.h>
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
origin.patch
arch-alpha-kernel-systblss-remove-debug-check.patch
i-need-old-gcc.patch
ipc-update-locking-scheme-comments-fix.patch
kernel-time-tick-commonc-document-tick_do_timer_cpu.patch
makefile-enable-werror=implicit-int-and-werror=strict-prototypes-by-default.patch
mm-readaheadc-do_readhead-dont-check-for-readpage.patch
mm.patch
mm-thp-khugepaged-add-policy-for-finding-target-node-fix.patch
kernel-printk-printkc-convert-to-pr_foo.patch
checkpatch-extend-camelcase-types-and-ignore-existing-camelcase-uses-in-a-patch.patch
checkpatch-add-test-for-defines-of-arch_has_foo.patch
binfmt_elfc-use-get_random_int-to-fix-entropy-depleting.patch
fat-additions-to-support-fat_fallocate.patch
fat-additions-to-support-fat_fallocate-v6-checkpatch-fixes.patch
gcov-add-support-for-gcc-47-gcov-format-fix.patch
gcov-add-support-for-gcc-47-gcov-format-fix-fix.patch
gcov-add-support-for-gcc-47-gcov-format-checkpatch-fixes.patch
kernel-modulec-use-pr_foo.patch
kernel-gcov-fsc-use-pr_warn.patch
linux-next.patch
linux-next-git-rejects.patch
mm-drop-actor-argument-of-do_generic_file_read-fix.patch
debugging-keep-track-of-page-owners-fix-2-fix.patch
debugging-keep-track-of-page-owners-fix-2-fix-fix-fix.patch
journal_add_journal_head-debug.patch
kernel-forkc-export-kernel_thread-to-modules.patch
mutex-subsystem-synchro-test-module.patch
slab-leaks3-default-y.patch
put_bh-debug.patch
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