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Commit 15d56ec7 authored by Vinayak Menon's avatar Vinayak Menon
Browse files

mm: showmem: make the notifiers atomic 



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: default avatarVinayak Menon <vinmenon@codeaurora.org>
parent cabe76e9

mm/showmem.c

+5 −5
Original line number Diff line number Diff line 
/*

 * 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
@@ -17,21 +17,21 @@ 
#include <linux/fs.h>

#include <linux/init.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)