864cc363bc
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. Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@mips.com> Cc: James Hogan <jhogan@kernel.org> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: linux-mips@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Paul Burton <paul.burton@mips.com>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
/*
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* Copyright (C) 2015 Imagination Technologies
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* Author: Paul Burton <paul.burton@mips.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <asm/bcache.h>
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#include <asm/debug.h>
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#include <linux/uaccess.h>
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#include <linux/debugfs.h>
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#include <linux/init.h>
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static ssize_t sc_prefetch_read(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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bool enabled = bc_prefetch_is_enabled();
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char buf[3];
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buf[0] = enabled ? 'Y' : 'N';
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buf[1] = '\n';
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buf[2] = 0;
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return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
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}
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static ssize_t sc_prefetch_write(struct file *file,
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const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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bool enabled;
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int err;
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err = kstrtobool_from_user(user_buf, count, &enabled);
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if (err)
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return err;
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if (enabled)
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bc_prefetch_enable();
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else
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bc_prefetch_disable();
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return count;
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}
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static const struct file_operations sc_prefetch_fops = {
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.open = simple_open,
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.llseek = default_llseek,
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.read = sc_prefetch_read,
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.write = sc_prefetch_write,
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};
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static int __init sc_debugfs_init(void)
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{
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struct dentry *dir;
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dir = debugfs_create_dir("l2cache", mips_debugfs_dir);
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debugfs_create_file("prefetch", S_IRUGO | S_IWUSR, dir, NULL,
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&sc_prefetch_fops);
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return 0;
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}
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late_initcall(sc_debugfs_init);
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