The patch titled
pidns: make pid->level and pid_ns->level unsigned
has been added to the -mm tree. Its filename is
pidns-make-pid-level-and-pid_ns-level-unsigned.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: pidns: make pid->level and pid_ns->level unsigned
From: Pavel Emelyanov <xemul@xxxxxxxxxx>
These values represent the nesting level of a namespace and pids living in it,
and it's always non-negative.
Turning this from int to unsigned int saves some space in pid.c (11 bytes on
x86 and 64 on ia64) by letting the compiler optimize the pid_nr_ns a bit.
E.g. on ia64 this removes the sign extension calls, which compiler adds to
optimize access to pid->nubers[ns->level].
Signed-off-by: Pavel Emelyanov <xemul@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pid.h | 2 +-
include/linux/pid_namespace.h | 2 +-
kernel/pid_namespace.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
diff -puN include/linux/pid.h~pidns-make-pid-level-and-pid_ns-level-unsigned include/linux/pid.h
--- a/include/linux/pid.h~pidns-make-pid-level-and-pid_ns-level-unsigned
+++ a/include/linux/pid.h
@@ -60,7 +60,7 @@ struct pid
/* lists of tasks that use this pid */
struct hlist_head tasks[PIDTYPE_MAX];
struct rcu_head rcu;
- int level;
+ unsigned int level;
struct upid numbers[1];
};
diff -puN include/linux/pid_namespace.h~pidns-make-pid-level-and-pid_ns-level-unsigned include/linux/pid_namespace.h
--- a/include/linux/pid_namespace.h~pidns-make-pid-level-and-pid_ns-level-unsigned
+++ a/include/linux/pid_namespace.h
@@ -20,7 +20,7 @@ struct pid_namespace {
int last_pid;
struct task_struct *child_reaper;
struct kmem_cache *pid_cachep;
- int level;
+ unsigned int level;
struct pid_namespace *parent;
#ifdef CONFIG_PROC_FS
struct vfsmount *proc_mnt;
diff -puN kernel/pid_namespace.c~pidns-make-pid-level-and-pid_ns-level-unsigned kernel/pid_namespace.c
--- a/kernel/pid_namespace.c~pidns-make-pid-level-and-pid_ns-level-unsigned
+++ a/kernel/pid_namespace.c
@@ -66,7 +66,7 @@ err_alloc:
return NULL;
}
-static struct pid_namespace *create_pid_namespace(int level)
+static struct pid_namespace *create_pid_namespace(unsigned int level)
{
struct pid_namespace *ns;
int i;
_
Patches currently in -mm which might be from xemul@xxxxxxxxxx are
use-find_task_by_vpid-in-audit-code.patch
ia64-fix-ptrace-inside-a-namespace.patch
udf-fix-anchor-point-detection.patch
cgroup-api-files-rename-read-write_uint-methods-to-read_write_u64.patch
cgroup-api-files-add-res_counter_read_u64.patch
cgroup-api-files-use-read_u64-in-memory-controller.patch
cgroup-api-files-strip-all-trailing-whitespace-in-cgroup_write_u64.patch
cgroup-api-files-update-cpusets-to-use-cgroup-structured-file-api.patch
cgroup-api-files-update-cpusets-to-use-cgroup-structured-file-api-fix.patch
cgroup-api-files-add-cgroup-map-data-type.patch
cgroup-api-files-use-cgroup-map-for-memcontrol-stats-file.patch
cgroup-api-files-drop-mem_cgroup_force_empty.patch
cgroup-api-files-move-releasable-to-cgroup_debug-subsystem.patch
cgroup-api-files-make-cgroup_debug-default-to-off.patch
remove-unused-variable-from-send_signal.patch
turn-legacy_queue-macro-into-static-inline-function.patch
consolidate-checking-for-ignored-legacy-signals.patch
consolidate-checking-for-ignored-legacy-signals-simplify.patch
signals-consolidate-checks-for-whether-or-not-to-ignore-a-signal.patch
signals-clean-dequeue_signal-from-excess-checks-and-assignments.patch
signals-consolidate-send_sigqueue-and-send_group_sigqueue.patch
signals-cleanup-security_task_kill-usage-implementation.patch
free_pidmap-turn-it-into-free_pidmapstruct-upid.patch
use-find_task_by_vpid-in-taskstats.patch
deprecate-find_task_by_pid.patch
pidns-make-pid-level-and-pid_ns-level-unsigned.patch
reiser4.patch
put_pid-make-sure-we-dont-free-the-live-pid.patch
-
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