On (11/14/14 00:22), Sergey Senozhatsky wrote:
> > Now zsmalloc can be registered as a zpool driver into zpool when
> > CONFIG_ZPOOL is enabled. During the init of zsmalloc, when error happens,
> > we need to do cleanup. But in current code, it will unregister a not yet
> > registered zsmalloc zpool driver(*zs_zpool_driver*).
> >
> > This patch puts the cleanup in zs_init() instead of calling zs_exit()
> > where it will unregister a not-registered zpool driver.
> >
> > Signed-off-by: Mahendran Ganesh <opensource.ganesh@xxxxxxxxx>
> > ---
> > mm/zsmalloc.c | 12 ++++++++----
> > 1 file changed, 8 insertions(+), 4 deletions(-)
> >
> > diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> > index 839a48c..3d2bb36 100644
> > --- a/mm/zsmalloc.c
> > +++ b/mm/zsmalloc.c
> > @@ -907,10 +907,8 @@ static int zs_init(void)
> > __register_cpu_notifier(&zs_cpu_nb);
> > for_each_online_cpu(cpu) {
> > ret = zs_cpu_notifier(NULL, CPU_UP_PREPARE, (void *)(long)cpu);
> > - if (notifier_to_errno(ret)) {
> > - cpu_notifier_register_done();
> > + if (notifier_to_errno(ret))
> > goto fail;
> > - }
> > }
> >
> > cpu_notifier_register_done();
> > @@ -920,8 +918,14 @@ static int zs_init(void)
> > #endif
> >
> > return 0;
> > +
> > fail:
> > - zs_exit();
> > + for_each_online_cpu(cpu)
> > + zs_cpu_notifier(NULL, CPU_UP_CANCELED, (void *)(long)cpu);
> > + __unregister_cpu_notifier(&zs_cpu_nb);
> > +
> > + cpu_notifier_register_done();
> > +
> > return notifier_to_errno(ret);
>
> so we duplicate same code, and there is a bit confusing part
> now: zs_cpu_notifier(CPU_UP_CANCELED) and zs_cpu_notifier(CPU_DEAD)
> calls.
>
>
> how about something like this?
arghhh... silly me. sorry! this wasn't even compile tested.
it should be zs_unregister_cpu_notifier(void). here it is.
Factor out zsmalloc cpu notifier unregistration code and call
it from both zs_exit() and zs_init() error path.
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
---
mm/zsmalloc.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index b3b57ef..8dda7c7 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -881,14 +881,10 @@ static struct notifier_block zs_cpu_nb = {
.notifier_call = zs_cpu_notifier
};
-static void zs_exit(void)
+static void zs_unregister_cpu_notifier(void)
{
int cpu;
-#ifdef CONFIG_ZPOOL
- zpool_unregister_driver(&zs_zpool_driver);
-#endif
-
cpu_notifier_register_begin();
for_each_online_cpu(cpu)
@@ -898,6 +894,14 @@ static void zs_exit(void)
cpu_notifier_register_done();
}
+static void zs_exit(void)
+{
+#ifdef CONFIG_ZPOOL
+ zpool_unregister_driver(&zs_zpool_driver);
+#endif
+ zs_unregister_cpu_notifier();
+}
+
static int zs_init(void)
{
int cpu, ret;
@@ -907,10 +911,8 @@ static int zs_init(void)
__register_cpu_notifier(&zs_cpu_nb);
for_each_online_cpu(cpu) {
ret = zs_cpu_notifier(NULL, CPU_UP_PREPARE, (void *)(long)cpu);
- if (notifier_to_errno(ret)) {
- cpu_notifier_register_done();
+ if (notifier_to_errno(ret))
goto fail;
- }
}
cpu_notifier_register_done();
@@ -921,7 +923,7 @@ static int zs_init(void)
return 0;
fail:
- zs_exit();
+ zs_unregister_cpu_notifier();
return notifier_to_errno(ret);
}
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