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Greg Kroah-Hartman
ae503ab049
When calling debugfs functions, there is no need to ever check the return value. The function can work or not, but the code logic should never do something different based on this. Signed-off-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Cc: John Stultz <[email protected]> Cc: Stephen Boyd <[email protected]> Link: https://lkml.kernel.org/r/[email protected]
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* debugfs file to track time spent in suspend
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*
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* Copyright (c) 2011, Google, Inc.
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*/
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#include <linux/debugfs.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/seq_file.h>
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#include <linux/suspend.h>
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#include <linux/time.h>
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#include "timekeeping_internal.h"
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#define NUM_BINS 32
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static unsigned int sleep_time_bin[NUM_BINS] = {0};
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static int tk_debug_sleep_time_show(struct seq_file *s, void *data)
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{
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unsigned int bin;
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seq_puts(s, " time (secs) count\n");
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seq_puts(s, "------------------------------\n");
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for (bin = 0; bin < 32; bin++) {
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if (sleep_time_bin[bin] == 0)
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continue;
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seq_printf(s, "%10u - %-10u %4u\n",
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bin ? 1 << (bin - 1) : 0, 1 << bin,
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sleep_time_bin[bin]);
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}
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(tk_debug_sleep_time);
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static int __init tk_debug_sleep_time_init(void)
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{
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debugfs_create_file("sleep_time", 0444, NULL, NULL,
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&tk_debug_sleep_time_fops);
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return 0;
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}
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late_initcall(tk_debug_sleep_time_init);
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void tk_debug_account_sleep_time(const struct timespec64 *t)
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{
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/* Cap bin index so we don't overflow the array */
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int bin = min(fls(t->tv_sec), NUM_BINS-1);
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sleep_time_bin[bin]++;
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pm_deferred_pr_dbg("Timekeeping suspended for %lld.%03lu seconds\n",
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(s64)t->tv_sec, t->tv_nsec / NSEC_PER_MSEC);
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}
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