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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>
This commit is contained in:
Vinayak Menon
2020-09-23 18:05:05 +02:00
committed by Francescodario Cuzzocrea
parent 7f7dc763ef
commit 896dd70336
1 changed files with 5 additions and 5 deletions
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mm/showmem.c
+5 -5
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2014, The Linux Foundation. All rights reserved.
* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
@@ -18,21 +18,21 @@
#include <linux/init.h>
#include <linux/module.h>
BLOCKING_NOTIFIER_HEAD(show_mem_notifier);
ATOMIC_NOTIFIER_HEAD(show_mem_notifier);
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)
{
return blocking_notifier_chain_unregister(&show_mem_notifier, nb);
return atomic_notifier_chain_unregister(&show_mem_notifier, nb);
}
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)