aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorRasmus Villemoes <linux@rasmusvillemoes.dk>2015-11-06 16:31:23 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-06 17:50:42 -0800
commitf773f32d71a4ed9a645634da107cd249e09e1180 (patch)
treed121a233372164a2b9d75614c9b95cce923b5584
parent0a9df786a6ae2f898114bdd242b64920dedf53bd (diff)
downloadlinux-linaro-stable-f773f32d71a4ed9a645634da107cd249e09e1180.tar.gz
lib/kobject.c: use kvasprintf_const for formatting ->name
Sometimes kobject_set_name_vargs is called with a format string conaining no %, or a format string of precisely "%s", where the single vararg happens to point to .rodata. kvasprintf_const detects these cases for us and returns a copy of that pointer instead of duplicating the string, thus saving some run-time memory. Otherwise, it falls back to kvasprintf. We just need to always deallocate ->name using kfree_const. Unfortunately, the dance we need to do to perform the '/' -> '!' sanitization makes the resulting code rather ugly. I instrumented kstrdup_const to provide some statistics on the memory saved, and for me this gave an additional ~14KB after boot (306KB was already saved; this patch bumped that to 320KB). I have KMALLOC_SHIFT_LOW==3, and since 80% of the kvasprintf_const hits were satisfied by an 8-byte allocation, the 14K would roughly be quadrupled when KMALLOC_SHIFT_LOW==5. Whether these numbers are sufficient to justify the ugliness I'll leave to others to decide. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--lib/kobject.c30
1 files changed, 22 insertions, 8 deletions
diff --git a/lib/kobject.c b/lib/kobject.c
index 055407746266..7cbccd2b4c72 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -257,18 +257,32 @@ static int kobject_add_internal(struct kobject *kobj)
int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
va_list vargs)
{
- char *s;
+ const char *s;
if (kobj->name && !fmt)
return 0;
- s = kvasprintf(GFP_KERNEL, fmt, vargs);
+ s = kvasprintf_const(GFP_KERNEL, fmt, vargs);
if (!s)
return -ENOMEM;
- /* ewww... some of these buggers have '/' in the name ... */
- strreplace(s, '/', '!');
- kfree(kobj->name);
+ /*
+ * ewww... some of these buggers have '/' in the name ... If
+ * that's the case, we need to make sure we have an actual
+ * allocated copy to modify, since kvasprintf_const may have
+ * returned something from .rodata.
+ */
+ if (strchr(s, '/')) {
+ char *t;
+
+ t = kstrdup(s, GFP_KERNEL);
+ kfree_const(s);
+ if (!t)
+ return -ENOMEM;
+ strreplace(t, '/', '!');
+ s = t;
+ }
+ kfree_const(kobj->name);
kobj->name = s;
return 0;
@@ -466,7 +480,7 @@ int kobject_rename(struct kobject *kobj, const char *new_name)
envp[0] = devpath_string;
envp[1] = NULL;
- name = dup_name = kstrdup(new_name, GFP_KERNEL);
+ name = dup_name = kstrdup_const(new_name, GFP_KERNEL);
if (!name) {
error = -ENOMEM;
goto out;
@@ -486,7 +500,7 @@ int kobject_rename(struct kobject *kobj, const char *new_name)
kobject_uevent_env(kobj, KOBJ_MOVE, envp);
out:
- kfree(dup_name);
+ kfree_const(dup_name);
kfree(devpath_string);
kfree(devpath);
kobject_put(kobj);
@@ -634,7 +648,7 @@ static void kobject_cleanup(struct kobject *kobj)
/* free name if we allocated it */
if (name) {
pr_debug("kobject: '%s': free name\n", name);
- kfree(name);
+ kfree_const(name);
}
}