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(un)register_hotcpu_notifier is obsolete

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v4.9-12228-g530e9b76ae8f Drops all (un)register_(hot)cpu_notifier()
API functions. From here on we need to use the new cpuhp_* API.

We avoid this entirely for now, at the cost of leaking pages until
the filesystem is unmounted.

Signed-off-by: Auke Kok <auke.kok@versity.com>
This commit is contained in:
Auke Kok
2023-05-11 15:39:56 -04:00
parent ec50e66fff
commit e88845d185
2 changed files with 18 additions and 0 deletions
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10
kmod/src/Makefile.kernelcompat
View File

@@ -194,3 +194,13 @@ endif
ifneq (,$(shell grep 'extern struct timespec64 current_time' include/linux/fs.h))
ccflags-y += -DKC_CURRENT_TIME_INODE=1
endif
#
# v4.9-12228-g530e9b76ae8f
#
# register_cpu_notifier and family were all removed and to be
# replaced with cpuhp_* API calls.
#
ifneq (,$(shell grep 'define register_hotcpu_notifier' include/linux/cpu.h))
ccflags-y += -DKC_CPU_NOTIFIER
endif

8
kmod/src/item.c
View File

@@ -78,7 +78,9 @@ struct item_cache_info {
struct super_block *sb;
struct item_percpu_pages __percpu *pcpu_pages;
KC_DEFINE_SHRINKER(shrinker);
#ifdef KC_CPU_NOTIFIER
struct notifier_block notifier;
#endif
/* often walked, but per-cpu refs are fast path */
rwlock_t rwlock;
@@ -2605,6 +2607,7 @@ static unsigned long item_cache_scan_objects(struct shrinker *shrink,
return freed;
}
#ifdef KC_CPU_NOTIFIER
static int item_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
@@ -2619,6 +2622,7 @@ static int item_cpu_callback(struct notifier_block *nfb,
return NOTIFY_OK;
}
#endif
int scoutfs_item_setup(struct super_block *sb)
{
@@ -2651,8 +2655,10 @@ int scoutfs_item_setup(struct super_block *sb)
KC_INIT_SHRINKER_FUNCS(&cinf->shrinker, item_cache_count_objects,
item_cache_scan_objects);
KC_REGISTER_SHRINKER(&cinf->shrinker);
#ifdef KC_CPU_NOTIFIER
cinf->notifier.notifier_call = item_cpu_callback;
register_hotcpu_notifier(&cinf->notifier);
#endif
sbi->item_cache_info = cinf;
return 0;
@@ -2672,7 +2678,9 @@ void scoutfs_item_destroy(struct super_block *sb)
if (cinf) {
BUG_ON(!list_empty(&cinf->active_list));
#ifdef KC_CPU_NOTIFIER
unregister_hotcpu_notifier(&cinf->notifier);
#endif
KC_UNREGISTER_SHRINKER(&cinf->shrinker);
for_each_possible_cpu(cpu)