The patch titled
Subject: [PATCH 1/2] Use list_head in binfmt handling
has been added to the -mm tree. Its filename is
use-list_head-in-binfmt-handling.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Subject: [PATCH 1/2] Use list_head in binfmt handling
From: Alexey Dobriyan <adobriyan@xxxxx>
Switch single-linked binfmt formats list to usual list_head's. This leads
to one-liners in register_binfmt() and unregister_binfmt(). The downside
is one pointer more in struct linux_binfmt. This is not a problem, since
the set of registered binfmts on typical box is very small (ELF + something
distro enabled for you).
Test-booted, played with executable .txt files, modprobe/rmmod binfmt_misc.
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/exec.c | 34 ++++++----------------------------
include/linux/binfmts.h | 2 +-
2 files changed, 7 insertions(+), 29 deletions(-)
diff -puN fs/exec.c~use-list_head-in-binfmt-handling fs/exec.c
--- a/fs/exec.c~use-list_head-in-binfmt-handling
+++ a/fs/exec.c
@@ -66,27 +66,15 @@ int suid_dumpable = 0;
EXPORT_SYMBOL(suid_dumpable);
/* The maximal length of core_pattern is also specified in sysctl.c */
-static struct linux_binfmt *formats;
+static LIST_HEAD(formats);
static DEFINE_RWLOCK(binfmt_lock);
int register_binfmt(struct linux_binfmt * fmt)
{
- struct linux_binfmt ** tmp = &formats;
-
if (!fmt)
return -EINVAL;
- if (fmt->next)
- return -EBUSY;
write_lock(&binfmt_lock);
- while (*tmp) {
- if (fmt == *tmp) {
- write_unlock(&binfmt_lock);
- return -EBUSY;
- }
- tmp = &(*tmp)->next;
- }
- fmt->next = formats;
- formats = fmt;
+ list_add(&fmt->lh, &formats);
write_unlock(&binfmt_lock);
return 0;
}
@@ -95,20 +83,10 @@ EXPORT_SYMBOL(register_binfmt);
int unregister_binfmt(struct linux_binfmt * fmt)
{
- struct linux_binfmt ** tmp = &formats;
-
write_lock(&binfmt_lock);
- while (*tmp) {
- if (fmt == *tmp) {
- *tmp = fmt->next;
- fmt->next = NULL;
- write_unlock(&binfmt_lock);
- return 0;
- }
- tmp = &(*tmp)->next;
- }
+ list_del(&fmt->lh);
write_unlock(&binfmt_lock);
- return -EINVAL;
+ return 0;
}
EXPORT_SYMBOL(unregister_binfmt);
@@ -155,7 +133,7 @@ asmlinkage long sys_uselib(const char __
struct linux_binfmt * fmt;
read_lock(&binfmt_lock);
- for (fmt = formats ; fmt ; fmt = fmt->next) {
+ list_for_each_entry(fmt, &formats, lh) {
if (!fmt->load_shlib)
continue;
if (!try_module_get(fmt->module))
@@ -1097,7 +1075,7 @@ int search_binary_handler(struct linux_b
retval = -ENOENT;
for (try=0; try<2; try++) {
read_lock(&binfmt_lock);
- for (fmt = formats ; fmt ; fmt = fmt->next) {
+ list_for_each_entry(fmt, &formats, lh) {
int (*fn)(struct linux_binprm *, struct pt_regs *) = fmt->load_binary;
if (!fn)
continue;
diff -puN include/linux/binfmts.h~use-list_head-in-binfmt-handling include/linux/binfmts.h
--- a/include/linux/binfmts.h~use-list_head-in-binfmt-handling
+++ a/include/linux/binfmts.h
@@ -56,7 +56,7 @@ struct linux_binprm{
* linux accepts.
*/
struct linux_binfmt {
- struct linux_binfmt * next;
+ struct list_head lh;
struct module *module;
int (*load_binary)(struct linux_binprm *, struct pt_regs * regs);
int (*load_shlib)(struct file *);
_
Patches currently in -mm which might be from adobriyan@xxxxx are
origin.patch
fix-sparse-false-positives-re-bug_onptr.patch
use-list_head-in-binfmt-handling.patch
make-unregister_binfmt-return-void.patch
-
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