The patch titled
Subject: fs-epoll-use-a-per-cpu-counter-for-users-watches-count-fix
has been added to the -mm tree. Its filename is
fs-epoll-use-a-per-cpu-counter-for-users-watches-count-fix.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/fs-epoll-use-a-per-cpu-counter-for-users-watches-count-fix.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/fs-epoll-use-a-per-cpu-counter-for-users-watches-count-fix.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: fs-epoll-use-a-per-cpu-counter-for-users-watches-count-fix
fix build, fix printk typo
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Anton Blanchard <anton@xxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/user.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/kernel/user.c~fs-epoll-use-a-per-cpu-counter-for-users-watches-count-fix
+++ a/kernel/user.c
@@ -138,7 +138,9 @@ static void free_user(struct user_struct
{
uid_hash_remove(up);
spin_unlock_irqrestore(&uidhash_lock, flags);
+#ifdef CONFIG_EPOLL
percpu_counter_destroy(&up->epoll_watches);
+#endif
kmem_cache_free(uid_cachep, up);
}
@@ -186,10 +188,12 @@ struct user_struct *alloc_uid(kuid_t uid
new->uid = uid;
refcount_set(&new->__count, 1);
+#ifdef CONFIG_EPOLL
if (percpu_counter_init(&new->epoll_watches, 0, GFP_KERNEL)) {
kmem_cache_free(uid_cachep, new);
return NULL;
}
+#endif
ratelimit_state_init(&new->ratelimit, HZ, 100);
ratelimit_set_flags(&new->ratelimit, RATELIMIT_MSG_ON_RELEASE);
@@ -200,7 +204,9 @@ struct user_struct *alloc_uid(kuid_t uid
spin_lock_irq(&uidhash_lock);
up = uid_hash_find(uid, hashent);
if (up) {
+#ifdef CONFIG_EPOLL
percpu_counter_destroy(&new->epoll_watches);
+#endif
kmem_cache_free(uid_cachep, new);
} else {
uid_hash_insert(new, hashent);
@@ -222,8 +228,10 @@ static int __init uid_cache_init(void)
for(n = 0; n < UIDHASH_SZ; ++n)
INIT_HLIST_HEAD(uidhash_table + n);
+#ifdef CONFIG_EPOLL
if (percpu_counter_init(&root_user.epoll_watches, 0, GFP_KERNEL))
- panic("percpu cpunter alloc failed");
+ panic("percpu counter alloc failed");
+#endif
/* Insert the root user immediately (init already runs as root) */
spin_lock_irq(&uidhash_lock);
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
mm.patch
lazy-tlb-allow-lazy-tlb-mm-refcounting-to-be-configurable-fix.patch
mm-compaction-optimize-proactive-compaction-deferrals-fix.patch
mm-compaction-support-triggering-of-proactive-compaction-by-user-fix.patch
mm-mempolicy-convert-from-atomic_t-to-refcount_t-on-mempolicy-refcnt-fix.patch
fs-epoll-use-a-per-cpu-counter-for-users-watches-count-fix.patch
log-if-a-core-dump-is-aborted-due-to-changed-file-permissions-fix.patch
linux-next-rejects.patch
kernel-forkc-export-kernel_thread-to-modules.patch
