The patch titled
Subject: userns: use irqsave variant of refcount_dec_and_lock()
has been added to the -mm tree. Its filename is
userns-use-irqsave-variant-of-refcount_dec_and_lock.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/userns-use-irqsave-variant-of-refcount_dec_and_lock.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/userns-use-irqsave-variant-of-refcount_dec_and_lock.patch
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------------------------------------------------------
From: Anna-Maria Gleixner <anna-maria@xxxxxxxxxxxxx>
Subject: userns: use irqsave variant of refcount_dec_and_lock()
The irqsave variant of refcount_dec_and_lock handles irqsave/restore when
taking/releasing the spin lock. With this variant the call of
local_irq_save/restore is no longer required.
[bigeasy@xxxxxxxxxxxxx: s@atomic_dec_and_lock@refcount_dec_and_lock@g]
Link: http://lkml.kernel.org/r/20180703200141.28415-7-bigeasy@xxxxxxxxxxxxx
Signed-off-by: Anna-Maria Gleixner <anna-maria@xxxxxxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
diff -puN kernel/user.c~userns-use-irqsave-variant-of-refcount_dec_and_lock kernel/user.c
--- a/kernel/user.c~userns-use-irqsave-variant-of-refcount_dec_and_lock
+++ a/kernel/user.c
@@ -169,11 +169,8 @@ void free_uid(struct user_struct *up)
if (!up)
return;
- local_irq_save(flags);
- if (refcount_dec_and_lock(&up->__count, &uidhash_lock))
+ if (refcount_dec_and_lock_irqsave(&up->__count, &uidhash_lock, &flags))
free_user(up, flags);
- else
- local_irq_restore(flags);
}
struct user_struct *alloc_uid(kuid_t uid)
_
Patches currently in -mm which might be from anna-maria@xxxxxxxxxxxxx are
bdi-use-irqsave-variant-of-refcount_dec_and_lock.patch
userns-use-irqsave-variant-of-refcount_dec_and_lock.patch
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