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mm: showmem: make the notifiers atomic

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There are places in kernel like the lowmemorykiller which
invokes show_mem_call_notifiers from an atomic context.
So move from a blocking notifier to atomic. At present
the notifier callbacks does not call sleeping functions,
but it should be made sure, it does not happen in future also.

Change-Id: I9668e67463ab8a6a60be55dbc86b88f45be8b041
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
[swatsrid@codeaurora.org: Fix merge conflicts]
Signed-off-by: Swathi Sridhar <swatsrid@codeaurora.org>
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Vinayak Menon
2015-04-16 16:51:47 -07:00
committed by Isaac J. Manjarres
parent 4a24d23163
commit 5ba88f8522
1 changed files with 5 additions and 5 deletions
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10
mm/showmem.c
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@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only // SPDX-License-Identifier: GPL-2.0-only
/* /*
* Copyright (c) 2014, The Linux Foundation. All rights reserved. * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
*/ */
#include <linux/kernel.h> #include <linux/kernel.h>
@@ -10,21 +10,21 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/show_mem_notifier.h> #include <linux/show_mem_notifier.h>
static BLOCKING_NOTIFIER_HEAD(show_mem_notifier); static ATOMIC_NOTIFIER_HEAD(show_mem_notifier);
int show_mem_notifier_register(struct notifier_block *nb) int show_mem_notifier_register(struct notifier_block *nb)
{ {
return blocking_notifier_chain_register(&show_mem_notifier, nb); return atomic_notifier_chain_register(&show_mem_notifier, nb);
} }
int show_mem_notifier_unregister(struct notifier_block *nb) int show_mem_notifier_unregister(struct notifier_block *nb)
{ {
return blocking_notifier_chain_unregister(&show_mem_notifier, nb); return atomic_notifier_chain_unregister(&show_mem_notifier, nb);
} }
void show_mem_call_notifiers(void) void show_mem_call_notifiers(void)
{ {
blocking_notifier_call_chain(&show_mem_notifier, 0, NULL); atomic_notifier_call_chain(&show_mem_notifier, 0, NULL);
} }
static int show_mem_notifier_get(void *dat, u64 *val) static int show_mem_notifier_get(void *dat, u64 *val)