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authorAlan Stern <stern@rowland.harvard.edu>2006-12-06 20:32:37 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:22 -0800
commita120586873d3d64de93bd6d593d237e131994e58 (patch)
treeae284884e23268e867f748a2ab52353cf2390e89
parentb30973f877fea1a3fb84e05599890fcc082a88e5 (diff)
downloadlinux-a120586873d3d64de93bd6d593d237e131994e58.tar.bz2
[PATCH] Allow NULL pointers in percpu_free
The patch (as824b) makes percpu_free() ignore NULL arguments, as one would expect for a deallocation routine. (Note that free_percpu is #defined as percpu_free in include/linux/percpu.h.) A few callers are updated to remove now-unneeded tests for NULL. A few other callers already seem to assume that passing a NULL pointer to percpu_free() is okay! The patch also removes an unnecessary NULL check in percpu_depopulate(). Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/i386/kernel/acpi/cstate.c6
-rw-r--r--block/blktrace.c3
-rw-r--r--mm/allocpercpu.c9
-rw-r--r--net/ipv6/af_inet6.c6
4 files changed, 10 insertions, 14 deletions
diff --git a/arch/i386/kernel/acpi/cstate.c b/arch/i386/kernel/acpi/cstate.c
index 4664b55f623e..12e937c1ce4b 100644
--- a/arch/i386/kernel/acpi/cstate.c
+++ b/arch/i386/kernel/acpi/cstate.c
@@ -156,10 +156,8 @@ static int __init ffh_cstate_init(void)
static void __exit ffh_cstate_exit(void)
{
- if (cpu_cstate_entry) {
- free_percpu(cpu_cstate_entry);
- cpu_cstate_entry = NULL;
- }
+ free_percpu(cpu_cstate_entry);
+ cpu_cstate_entry = NULL;
}
arch_initcall(ffh_cstate_init);
diff --git a/block/blktrace.c b/block/blktrace.c
index 74e02c04b2da..d3679dd1d220 100644
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -394,8 +394,7 @@ err:
if (bt) {
if (bt->dropped_file)
debugfs_remove(bt->dropped_file);
- if (bt->sequence)
- free_percpu(bt->sequence);
+ free_percpu(bt->sequence);
if (bt->rchan)
relay_close(bt->rchan);
kfree(bt);
diff --git a/mm/allocpercpu.c b/mm/allocpercpu.c
index eaa9abeea536..b2486cf887a0 100644
--- a/mm/allocpercpu.c
+++ b/mm/allocpercpu.c
@@ -17,10 +17,9 @@
void percpu_depopulate(void *__pdata, int cpu)
{
struct percpu_data *pdata = __percpu_disguise(__pdata);
- if (pdata->ptrs[cpu]) {
- kfree(pdata->ptrs[cpu]);
- pdata->ptrs[cpu] = NULL;
- }
+
+ kfree(pdata->ptrs[cpu]);
+ pdata->ptrs[cpu] = NULL;
}
EXPORT_SYMBOL_GPL(percpu_depopulate);
@@ -123,6 +122,8 @@ EXPORT_SYMBOL_GPL(__percpu_alloc_mask);
*/
void percpu_free(void *__pdata)
{
+ if (unlikely(!__pdata))
+ return;
__percpu_depopulate_mask(__pdata, &cpu_possible_map);
kfree(__percpu_disguise(__pdata));
}
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 87c8f54872b7..e5cd83b2205d 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -720,10 +720,8 @@ snmp6_mib_free(void *ptr[2])
{
if (ptr == NULL)
return;
- if (ptr[0])
- free_percpu(ptr[0]);
- if (ptr[1])
- free_percpu(ptr[1]);
+ free_percpu(ptr[0]);
+ free_percpu(ptr[1]);
ptr[0] = ptr[1] = NULL;
}