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Date: Tue, 04 Feb 2014 22:36:29 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Sebastian Capella <sebastian.capella@...aro.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
linux-pm@...r.kernel.org, linaro-kernel@...ts.linaro.org,
patches@...aro.org, Pavel Machek <pavel@....cz>,
Len Brown <len.brown@...el.com>
Subject: Re: [PATCH v7 2/3] trivial: PM / Hibernate: clean up checkpatch in hibernate.c
On Tuesday, February 04, 2014 12:43:50 PM Sebastian Capella wrote:
> Checkpatch reports several warnings in hibernate.c
> printk use removed, long lines wrapped, whitespace cleanup,
> extend short msleeps, while loops on two lines.
Well, this isn't a trivial patch.
> Signed-off-by: Sebastian Capella <sebastian.capella@...aro.org>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Len Brown <len.brown@...el.com>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> ---
> kernel/power/hibernate.c | 62 ++++++++++++++++++++++++----------------------
> 1 file changed, 32 insertions(+), 30 deletions(-)
>
> diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
> index 0121dab..cd1e30c 100644
> --- a/kernel/power/hibernate.c
> +++ b/kernel/power/hibernate.c
> @@ -94,7 +94,7 @@ EXPORT_SYMBOL(system_entering_hibernation);
> #ifdef CONFIG_PM_DEBUG
> static void hibernation_debug_sleep(void)
> {
> - printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
> + pr_info("hibernation debug: Waiting for 5 seconds.\n");
> mdelay(5000);
> }
>
> @@ -239,7 +239,7 @@ void swsusp_show_speed(struct timeval *start, struct timeval *stop,
> centisecs = 1; /* avoid div-by-zero */
> k = nr_pages * (PAGE_SIZE / 1024);
> kps = (k * 100) / centisecs;
> - printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n",
> + pr_info("PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n",
> msg, k,
> centisecs / 100, centisecs % 100,
> kps / 1000, (kps % 1000) / 10);
> @@ -260,8 +260,7 @@ static int create_image(int platform_mode)
>
> error = dpm_suspend_end(PMSG_FREEZE);
> if (error) {
> - printk(KERN_ERR "PM: Some devices failed to power down, "
> - "aborting hibernation\n");
> + pr_err("PM: Some devices failed to power down, aborting hibernation\n");
> return error;
> }
>
> @@ -277,8 +276,7 @@ static int create_image(int platform_mode)
>
> error = syscore_suspend();
> if (error) {
> - printk(KERN_ERR "PM: Some system devices failed to power down, "
> - "aborting hibernation\n");
> + pr_err("PM: Some system devices failed to power down, aborting hibernation\n");
> goto Enable_irqs;
> }
>
> @@ -289,8 +287,7 @@ static int create_image(int platform_mode)
> save_processor_state();
> error = swsusp_arch_suspend();
> if (error)
> - printk(KERN_ERR "PM: Error %d creating hibernation image\n",
> - error);
> + pr_err("PM: Error %d creating hibernation image\n", error);
> /* Restore control flow magically appears here */
> restore_processor_state();
> if (!in_suspend) {
> @@ -413,8 +410,7 @@ static int resume_target_kernel(bool platform_mode)
>
> error = dpm_suspend_end(PMSG_QUIESCE);
> if (error) {
> - printk(KERN_ERR "PM: Some devices failed to power down, "
> - "aborting resume\n");
> + pr_err("PM: Some devices failed to power down, aborting resume\n");
> return error;
> }
>
> @@ -550,7 +546,8 @@ int hibernation_platform_enter(void)
>
> hibernation_ops->enter();
> /* We should never get here */
> - while (1);
> + while (1)
> + ;
Please remove this change from the patch. I don't care about checkpatch
complaining here.
>
> Power_up:
> syscore_resume();
> @@ -611,8 +608,7 @@ static void power_down(void)
> */
> error = swsusp_unmark();
> if (error)
> - printk(KERN_ERR "PM: Swap will be unusable! "
> - "Try swapon -a.\n");
> + pr_err("PM: Swap will be unusable! Try swapon -a.\n");
> return;
> #endif
> }
> @@ -621,8 +617,9 @@ static void power_down(void)
> * Valid image is on the disk, if we continue we risk serious data
> * corruption after resume.
> */
> - printk(KERN_CRIT "PM: Please power down manually\n");
> - while(1);
> + pr_crit("PM: Please power down manually\n");
> + while (1)
> + ;
Same here.
> }
>
> /**
> @@ -644,9 +641,9 @@ int hibernate(void)
> if (error)
> goto Exit;
>
> - printk(KERN_INFO "PM: Syncing filesystems ... ");
> + pr_info("PM: Syncing filesystems ... ");
> sys_sync();
> - printk("done.\n");
> + pr_cont("done.\n");
>
> error = freeze_processes();
> if (error)
> @@ -670,7 +667,7 @@ int hibernate(void)
> if (nocompress)
> flags |= SF_NOCOMPRESS_MODE;
> else
> - flags |= SF_CRC32_MODE;
> + flags |= SF_CRC32_MODE;
>
> pr_debug("PM: writing image.\n");
> error = swsusp_write(flags);
> @@ -750,7 +747,7 @@ static int software_resume(void)
> pr_debug("PM: Checking hibernation image partition %s\n", resume_file);
>
> if (resume_delay) {
> - printk(KERN_INFO "Waiting %dsec before reading resume device...\n",
> + pr_info("Waiting %dsec before reading resume device...\n",
> resume_delay);
> ssleep(resume_delay);
> }
> @@ -765,7 +762,7 @@ static int software_resume(void)
> if (isdigit(resume_file[0]) && resume_wait) {
> int partno;
> while (!get_gendisk(swsusp_resume_device, &partno))
> - msleep(10);
> + msleep(20);
That's the reason why it is not trivial.
First, the change being made doesn't belong in this patch.
Second, what's the problem with the original value?
> }
>
> if (!swsusp_resume_device) {
> @@ -776,8 +773,9 @@ static int software_resume(void)
> wait_for_device_probe();
>
> if (resume_wait) {
> - while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
> - msleep(10);
> + while ((swsusp_resume_device =
> + name_to_dev_t(resume_file)) == 0)
> + msleep(20);
And here?
> async_synchronize_full();
> }
>
> @@ -826,7 +824,7 @@ static int software_resume(void)
> if (!error)
> hibernation_restore(flags & SF_PLATFORM_MODE);
>
> - printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
> + pr_err("PM: Failed to load hibernation image, recovering.\n");
> swsusp_free();
> free_basic_memory_bitmaps();
> Thaw:
> @@ -965,7 +963,7 @@ power_attr(disk);
> static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
> char *buf)
> {
> - return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
> + return sprintf(buf, "%d:%d\n", MAJOR(swsusp_resume_device),
> MINOR(swsusp_resume_device));
> }
>
> @@ -986,7 +984,7 @@ static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
> lock_system_sleep();
> swsusp_resume_device = res;
> unlock_system_sleep();
> - printk(KERN_INFO "PM: Starting manual resume from disk\n");
> + pr_info("PM: Starting manual resume from disk\n");
> noresume = 0;
> software_resume();
> ret = n;
> @@ -996,13 +994,15 @@ static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
>
> power_attr(resume);
>
> -static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
> +static ssize_t image_size_show(struct kobject *kobj,
> + struct kobj_attribute *attr,
> char *buf)
Why can't you leave the code as is here?
> {
> return sprintf(buf, "%lu\n", image_size);
> }
>
> -static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
> +static ssize_t image_size_store(struct kobject *kobj,
> + struct kobj_attribute *attr,
> const char *buf, size_t n)
And here?
> {
> unsigned long size;
> @@ -1039,7 +1039,7 @@ static ssize_t reserved_size_store(struct kobject *kobj,
>
> power_attr(reserved_size);
>
> -static struct attribute * g[] = {
> +static struct attribute *g[] = {
> &disk_attr.attr,
> &resume_attr.attr,
> &image_size_attr.attr,
> @@ -1066,7 +1066,7 @@ static int __init resume_setup(char *str)
> if (noresume)
> return 1;
>
> - strncpy( resume_file, str, 255 );
> + strncpy(resume_file, str, 255);
> return 1;
> }
>
> @@ -1106,7 +1106,9 @@ static int __init resumewait_setup(char *str)
>
> static int __init resumedelay_setup(char *str)
> {
> - resume_delay = simple_strtoul(str, NULL, 0);
> + int ret = kstrtoint(str, 0, &resume_delay);
> + /* mask must_check warn; on failure, leaves resume_delay unchanged */
> + (void)ret;
And that's not a trivial change surely?
And why didn't you do (void)kstrtoint(str, 0, &resume_delay); instead?
> return 1;
> }
>
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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