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Commit 5ba88f85 authored by Vinayak Menon's avatar Vinayak Menon Committed by Isaac J. Manjarres
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>
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
[swatsrid@codeaurora.org: Fix merge conflicts]
Signed-off-by: default avatarSwathi Sridhar <swatsrid@codeaurora.org>
Signed-off-by: default avatarIsaac J. Manjarres <isaacm@codeaurora.org>
parent 4a24d231

mm/showmem.c

+5 −5
Original line number Diff line number Diff line 
// 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>
@@ -10,21 +10,21 @@ 
#include <linux/init.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)

{

	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)