5ba88f8522
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>
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/notifier.h>
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#include <linux/debugfs.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/show_mem_notifier.h>
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static ATOMIC_NOTIFIER_HEAD(show_mem_notifier);
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int show_mem_notifier_register(struct notifier_block *nb)
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{
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return atomic_notifier_chain_register(&show_mem_notifier, nb);
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}
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int show_mem_notifier_unregister(struct notifier_block *nb)
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{
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return atomic_notifier_chain_unregister(&show_mem_notifier, nb);
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}
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void show_mem_call_notifiers(void)
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{
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atomic_notifier_call_chain(&show_mem_notifier, 0, NULL);
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}
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static int show_mem_notifier_get(void *dat, u64 *val)
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{
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show_mem_call_notifiers();
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*val = 0;
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return 0;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(show_mem_notifier_debug_ops, show_mem_notifier_get,
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NULL, "%llu\n");
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static int show_mem_notifier_debugfs_register(void)
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{
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debugfs_create_file("show_mem_notifier", 0664, NULL, NULL,
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&show_mem_notifier_debug_ops);
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return 0;
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}
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late_initcall(show_mem_notifier_debugfs_register);
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