The patch titled
kernel/sys.c: improve code generation
has been removed from the -mm tree. Its filename was
kernel-sysc-improve-code-generation.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: kernel/sys.c: improve code generation
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
utsname() is quite expensive to calculate. Cache it in a local.
text data bss dec hex filename
before: 11136 720 16 11872 2e60 kernel/sys.o
after: 11096 720 16 11832 2e38 kernel/sys.o
Acked-by: Vegard Nossum <vegard.nossum@xxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Acked-by: "Serge E. Hallyn" <serue@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sys.c | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)
diff -puN kernel/sys.c~kernel-sysc-improve-code-generation kernel/sys.c
--- a/kernel/sys.c~kernel-sysc-improve-code-generation
+++ a/kernel/sys.c
@@ -1349,9 +1349,10 @@ asmlinkage long sys_sethostname(char __u
down_write(&uts_sem);
errno = -EFAULT;
if (!copy_from_user(tmp, name, len)) {
- memcpy(utsname()->nodename, tmp, len);
- memset(utsname()->nodename + len, 0,
- sizeof(utsname()->nodename) - len);
+ struct new_utsname *u = utsname();
+
+ memcpy(u->nodename, tmp, len);
+ memset(u->nodename + len, 0, sizeof(u->nodename) - len);
errno = 0;
}
up_write(&uts_sem);
@@ -1363,15 +1364,17 @@ asmlinkage long sys_sethostname(char __u
asmlinkage long sys_gethostname(char __user *name, int len)
{
int i, errno;
+ struct new_utsname *u;
if (len < 0)
return -EINVAL;
down_read(&uts_sem);
- i = 1 + strlen(utsname()->nodename);
+ u = utsname();
+ i = 1 + strlen(u->nodename);
if (i > len)
i = len;
errno = 0;
- if (copy_to_user(name, utsname()->nodename, i))
+ if (copy_to_user(name, u->nodename, i))
errno = -EFAULT;
up_read(&uts_sem);
return errno;
@@ -1396,9 +1399,10 @@ asmlinkage long sys_setdomainname(char _
down_write(&uts_sem);
errno = -EFAULT;
if (!copy_from_user(tmp, name, len)) {
- memcpy(utsname()->domainname, tmp, len);
- memset(utsname()->domainname + len, 0,
- sizeof(utsname()->domainname) - len);
+ struct new_utsname *u = utsname();
+
+ memcpy(u->domainname, tmp, len);
+ memset(u->domainname + len, 0, sizeof(u->domainname) - len);
errno = 0;
}
up_write(&uts_sem);
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
origin.patch
mm-cleanup-to-make-remove_memory-arch-neutral-fix.patch
vmscan-move-isolate_lru_page-to-vmscanc.patch
define-page_file_cache-function.patch
vmscan-split-lru-lists-into-anon-file-sets.patch
vmscan-fix-pagecache-reclaim-referenced-bit-check-fix.patch
vmscan-fix-pagecache-reclaim-referenced-bit-check-fix-fix.patch
vmscan-fix-pagecache-reclaim-referenced-bit-check-fix-fix-fix.patch
unevictable-lru-infrastructure.patch
unevictable-lru-page-statistics.patch
mlock-mlocked-pages-are-unevictable.patch
mmap-handle-mlocked-pages-during-map-remap-unmap.patch
mmap-handle-mlocked-pages-during-map-remap-unmap-mlock-resubmit-locked_vm-adjustment-as-separate-patch-fix.patch
vmscan-unevictable-lru-scan-sysctl.patch
mlock-make-mlock-error-return-posixly-correct-fix.patch
mm-rewrite-vmap-layer.patch
memory_probe-fix-wrong-sysfs-file-attribute-fix.patch
container-freezer-add-tif_freeze-flag-to-all-architectures-fix.patch
container-freezer-implement-freezer-cgroup-subsystem-checkpatch-fixes.patch
container-freezer-implement-freezer-cgroup-subsystem-uninline-thaw_process-fix.patch
hwmon-pc87360-separate-alarm-files-add-in-min-max-alarms-cleanup.patch
hwmon-pc87360-separate-alarm-files-add-temp-min-max-crit-fault-alarms-cleanup.patch
hwmon-pc87360-separate-alarm-files-add-therm-min-max-crit-alarms-cleanup.patch
drivers-hwmon-applesmcc-remove-unneeded-casts.patch
fb-push-down-the-bkl-in-the-ioctl-handler-checkpatch-fixes.patch
ext3-fix-ext3_dx_readdir-hash-collision-handling-checkpatch-fixes.patch
cgroups-fix-probable-race-with-put_css_set-and-find_css_set-fix.patch
message-queues-increase-range-limits-checkpatch-fixes.patch
drivers-rtc-rtc-bq4802c-dont-use-bin_2_bcd-and-bcd_2_bin.patch
x86-sysfs-kill-owner-field-from-attribute-fix.patch
x86-sysfs-kill-owner-field-from-attribute-fix-3.patch
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