| Message ID | 20240404071350.4242-7-linux.amoon@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2,1/6] usb: ehci-exynos: Use devm_clk_get_enabled() helpers | expand |
On Wed, Apr 10, 2024, Anand Moon wrote: > Hi Thinh, > > On Tue, 9 Apr 2024 at 07:24, Thinh Nguyen <Thinh.Nguyen@synopsys.com> wrote: > > > > On Thu, Apr 04, 2024, Anand Moon wrote: > > > Use the new PM macros for the suspend and resume functions to be > > > automatically dropped by the compiler when CONFIG_PM_SLEEP are disabled, > > > without having to use #ifdef guards. If CONFIG_PM_SLEEP unused, > > > they will simply be discarded by the compiler. > > > > > > Signed-off-by: Anand Moon <linux.amoon@gmail.com> > > > --- > > > v2: add __maybe_unused to suspend/resume functions in case CONFIG_PM is > > > disabled. > > > > The compiler discards the code, yet we still need __maybe_unused? > > > Earlier version had not added this since but I removed the > guard.CONFIG_PM_SLEEP. > added __maybe_unused just to safeguard the function. > > I have tried to build with config by disabling CONFIG_PM and CONFIG_PM_SLEEP > but could get the warning compilation by adding flag W=1 > -Werror=unused-function. > <snip> > > But since these CONFIG_PM and CONFIG_PM_SLEEP cannot be disabled, > I am not getting any warning related to these functions. > > Do you want me to remove __maybe_unused ? > The warning was there as expected. You should to use it along with DEFINE_SIMPLE_DEV_PM_OPS(). Let me know if you still see the same warning. BR, Thinh
On Thu, Apr 11, 2024, Anand Moon wrote: > Hi Thinh, > > On Thu, 11 Apr 2024 at 04:56, Thinh Nguyen <Thinh.Nguyen@synopsys.com> wrote: > > > > On Wed, Apr 10, 2024, Anand Moon wrote: > > > Hi Thinh, > > > > > > On Tue, 9 Apr 2024 at 07:24, Thinh Nguyen <Thinh.Nguyen@synopsys.com> wrote: > > > > > > > > On Thu, Apr 04, 2024, Anand Moon wrote: > > > > > Use the new PM macros for the suspend and resume functions to be > > > > > automatically dropped by the compiler when CONFIG_PM_SLEEP are disabled, > > > > > without having to use #ifdef guards. If CONFIG_PM_SLEEP unused, > > > > > they will simply be discarded by the compiler. > > > > > > > > > > Signed-off-by: Anand Moon <linux.amoon@gmail.com> > > > > > --- > > > > > v2: add __maybe_unused to suspend/resume functions in case CONFIG_PM is > > > > > disabled. > > > > > > > > The compiler discards the code, yet we still need __maybe_unused? > > > > > > > Earlier version had not added this since but I removed the > > > guard.CONFIG_PM_SLEEP. > > > added __maybe_unused just to safeguard the function. > > > > > > I have tried to build with config by disabling CONFIG_PM and CONFIG_PM_SLEEP > > > but could get the warning compilation by adding flag W=1 > > > -Werror=unused-function. > > > > > > > <snip> > > > > > > > > But since these CONFIG_PM and CONFIG_PM_SLEEP cannot be disabled, > > > I am not getting any warning related to these functions. > > > > > > Do you want me to remove __maybe_unused ? > > > > > > > The warning was there as expected. You should to use it along with > > DEFINE_SIMPLE_DEV_PM_OPS(). Let me know if you still see the same > > warning. > > > > But the warnings are related to the following macros > > #define PTR_IF(cond, ptr) ((cond) ? (ptr) : NULL) > > #define pm_ptr(_ptr) PTR_IF(IS_ENABLED(CONFIG_PM), (_ptr)) > #define pm_sleep_ptr(_ptr) PTR_IF(IS_ENABLED(CONFIG_PM_SLEEP), (_ptr)) > > So if we can disable CONFIG_PM and CONFIG_PM_SLEEP options > the relevant function with the above macro will be set to NULL. > in this case, the compiler will discard the function in SET_SYSTEM_SLEEP_PM_OPS > There are differences if you use SET_SYSTEM_SLEEP_PM_OPS vs the new macro. It's noted in this commit: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1a3c7bb088266fa2db017be299f91f1c1894c857 Please try it out. Thanks, Thinh
Hi Thinh, On Fri, 12 Apr 2024 at 03:52, Thinh Nguyen <Thinh.Nguyen@synopsys.com> wrote: > > On Thu, Apr 11, 2024, Anand Moon wrote: > > Hi Thinh, > > > > On Thu, 11 Apr 2024 at 04:56, Thinh Nguyen <Thinh.Nguyen@synopsys.com> wrote: > > > > > > On Wed, Apr 10, 2024, Anand Moon wrote: > > > > Hi Thinh, > > > > > > > > On Tue, 9 Apr 2024 at 07:24, Thinh Nguyen <Thinh.Nguyen@synopsys.com> wrote: > > > > > > > > > > On Thu, Apr 04, 2024, Anand Moon wrote: > > > > > > Use the new PM macros for the suspend and resume functions to be > > > > > > automatically dropped by the compiler when CONFIG_PM_SLEEP are disabled, > > > > > > without having to use #ifdef guards. If CONFIG_PM_SLEEP unused, > > > > > > they will simply be discarded by the compiler. > > > > > > > > > > > > Signed-off-by: Anand Moon <linux.amoon@gmail.com> > > > > > > --- > > > > > > v2: add __maybe_unused to suspend/resume functions in case CONFIG_PM is > > > > > > disabled. > > > > > > > > > > The compiler discards the code, yet we still need __maybe_unused? > > > > > > > > > Earlier version had not added this since but I removed the > > > > guard.CONFIG_PM_SLEEP. > > > > added __maybe_unused just to safeguard the function. > > > > > > > > I have tried to build with config by disabling CONFIG_PM and CONFIG_PM_SLEEP > > > > but could get the warning compilation by adding flag W=1 > > > > -Werror=unused-function. > > > > > > > > > > <snip> > > > > > > > > > > > But since these CONFIG_PM and CONFIG_PM_SLEEP cannot be disabled, > > > > I am not getting any warning related to these functions. > > > > > > > > Do you want me to remove __maybe_unused ? > > > > > > > > > > The warning was there as expected. You should to use it along with > > > DEFINE_SIMPLE_DEV_PM_OPS(). Let me know if you still see the same > > > warning. > > > > > > > But the warnings are related to the following macros > > > > #define PTR_IF(cond, ptr) ((cond) ? (ptr) : NULL) > > > > #define pm_ptr(_ptr) PTR_IF(IS_ENABLED(CONFIG_PM), (_ptr)) > > #define pm_sleep_ptr(_ptr) PTR_IF(IS_ENABLED(CONFIG_PM_SLEEP), (_ptr)) > > > > So if we can disable CONFIG_PM and CONFIG_PM_SLEEP options > > the relevant function with the above macro will be set to NULL. > > in this case, the compiler will discard the function in SET_SYSTEM_SLEEP_PM_OPS > > > > There are differences if you use SET_SYSTEM_SLEEP_PM_OPS vs the new > macro. It's noted in this commit: > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1a3c7bb088266fa2db017be299f91f1c1894c857 > > Please try it out. Thank you very much for this input I will drop the __maybe_unused from my patch series. and switch to use DEFINE_SIMPLE_DEV_PM_OPS macro for suspend resume functions > > Thanks, > Thinh Thanks -Anand
diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-exynos.c index 2d341f0e22a3..90259ad1d0d9 100644 --- a/drivers/usb/dwc3/dwc3-exynos.c +++ b/drivers/usb/dwc3/dwc3-exynos.c @@ -161,8 +161,7 @@ static const struct of_device_id exynos_dwc3_match[] = { }; MODULE_DEVICE_TABLE(of, exynos_dwc3_match); -#ifdef CONFIG_PM_SLEEP -static int dwc3_exynos_suspend(struct device *dev) +static int __maybe_unused dwc3_exynos_suspend(struct device *dev) { struct dwc3_exynos *exynos = dev_get_drvdata(dev); int i; @@ -173,7 +172,7 @@ static int dwc3_exynos_suspend(struct device *dev) return 0; } -static int dwc3_exynos_resume(struct device *dev) +static int __maybe_unused dwc3_exynos_resume(struct device *dev) { struct dwc3_exynos *exynos = dev_get_drvdata(dev); int i, ret; @@ -194,18 +193,13 @@ static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume) }; -#define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops) -#else -#define DEV_PM_OPS NULL -#endif /* CONFIG_PM_SLEEP */ - static struct platform_driver dwc3_exynos_driver = { .probe = dwc3_exynos_probe, .remove_new = dwc3_exynos_remove, .driver = { .name = "exynos-dwc3", .of_match_table = exynos_dwc3_match, - .pm = DEV_PM_OPS, + .pm = pm_sleep_ptr(&dwc3_exynos_dev_pm_ops), }, };
Use the new PM macros for the suspend and resume functions to be automatically dropped by the compiler when CONFIG_PM_SLEEP are disabled, without having to use #ifdef guards. If CONFIG_PM_SLEEP unused, they will simply be discarded by the compiler. Signed-off-by: Anand Moon <linux.amoon@gmail.com> --- v2: add __maybe_unused to suspend/resume functions in case CONFIG_PM is disabled. --- drivers/usb/dwc3/dwc3-exynos.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-)