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| Started by | Arnd Bergmann <arnd@arndb.de> |
|---|---|
| First post | 2017-05-18 15:30 +0200 |
| Last post | 2017-05-19 09:00 +0200 |
| Articles | 6 — 3 participants |
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[PATCH] staging: greybus: mark PM functions as __maybe_unused Arnd Bergmann <arnd@arndb.de> - 2017-05-18 15:30 +0200
Re: [PATCH] staging: greybus: mark PM functions as __maybe_unused Johan Hovold <johan@kernel.org> - 2017-05-18 15:40 +0200
Re: [greybus-dev] [PATCH] staging: greybus: mark PM functions as __maybe_unused Viresh Kumar <viresh.kumar@linaro.org> - 2017-05-18 16:20 +0200
Re: [greybus-dev] [PATCH] staging: greybus: mark PM functions as __maybe_unused Arnd Bergmann <arnd@arndb.de> - 2017-05-18 17:00 +0200
Re: [greybus-dev] [PATCH] staging: greybus: mark PM functions as __maybe_unused Viresh Kumar <viresh.kumar@linaro.org> - 2017-05-19 05:50 +0200
Re: [greybus-dev] [PATCH] staging: greybus: mark PM functions as __maybe_unused Arnd Bergmann <arnd@arndb.de> - 2017-05-19 09:00 +0200
| From | Arnd Bergmann <arnd@arndb.de> |
|---|---|
| Date | 2017-05-18 15:30 +0200 |
| Subject | [PATCH] staging: greybus: mark PM functions as __maybe_unused |
| Message-ID | <tItF7-37o-19@gated-at.bofh.it> |
Enabling the arche platform for compile testing showed a harmless
warning with CONFIG_PM=n:
drivers/staging/greybus/arche-platform.c:632:12: error: 'arche_platform_resume' defined but not used [-Werror=unused-function]
drivers/staging/greybus/arche-platform.c:618:12: error: 'arche_platform_suspend' defined but not used [-Werror=unused-function]
This marks the functions as __maybe_unused to shut up the warnings.
Fixes: 2eccd4aa19fc ("staging: greybus: enable compile testing of arche driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/staging/greybus/arche-platform.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
index 5bce5e039596..eced2d26467b 100644
--- a/drivers/staging/greybus/arche-platform.c
+++ b/drivers/staging/greybus/arche-platform.c
@@ -615,7 +615,7 @@ static int arche_platform_remove(struct platform_device *pdev)
return 0;
}
-static int arche_platform_suspend(struct device *dev)
+static __maybe_unused int arche_platform_suspend(struct device *dev)
{
/*
* If timing profile premits, we may shutdown bridge
@@ -629,7 +629,7 @@ static int arche_platform_suspend(struct device *dev)
return 0;
}
-static int arche_platform_resume(struct device *dev)
+static __maybe_unused int arche_platform_resume(struct device *dev)
{
/*
* Atleast for ES2 we have to meet the delay requirement between
--
2.9.0
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| From | Johan Hovold <johan@kernel.org> |
|---|---|
| Date | 2017-05-18 15:40 +0200 |
| Message-ID | <tItON-3bL-17@gated-at.bofh.it> |
| In reply to | #1644506 |
On Thu, May 18, 2017 at 03:28:00PM +0200, Arnd Bergmann wrote:
> Enabling the arche platform for compile testing showed a harmless
> warning with CONFIG_PM=n:
>
> drivers/staging/greybus/arche-platform.c:632:12: error: 'arche_platform_resume' defined but not used [-Werror=unused-function]
> drivers/staging/greybus/arche-platform.c:618:12: error: 'arche_platform_suspend' defined but not used [-Werror=unused-function]
>
> This marks the functions as __maybe_unused to shut up the warnings.
>
> Fixes: 2eccd4aa19fc ("staging: greybus: enable compile testing of arche driver")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Johan Hovold <johan@kernel.org>
Thanks for fixing this.
Johan
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| From | Viresh Kumar <viresh.kumar@linaro.org> |
|---|---|
| Date | 2017-05-18 16:20 +0200 |
| Subject | Re: [greybus-dev] [PATCH] staging: greybus: mark PM functions as __maybe_unused |
| Message-ID | <tIurv-3RH-5@gated-at.bofh.it> |
| In reply to | #1644506 |
On 18-05-17, 15:28, Arnd Bergmann wrote:
> Enabling the arche platform for compile testing showed a harmless
> warning with CONFIG_PM=n:
>
> drivers/staging/greybus/arche-platform.c:632:12: error: 'arche_platform_resume' defined but not used [-Werror=unused-function]
> drivers/staging/greybus/arche-platform.c:618:12: error: 'arche_platform_suspend' defined but not used [-Werror=unused-function]
>
> This marks the functions as __maybe_unused to shut up the warnings.
>
> Fixes: 2eccd4aa19fc ("staging: greybus: enable compile testing of arche driver")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> drivers/staging/greybus/arche-platform.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
> index 5bce5e039596..eced2d26467b 100644
> --- a/drivers/staging/greybus/arche-platform.c
> +++ b/drivers/staging/greybus/arche-platform.c
> @@ -615,7 +615,7 @@ static int arche_platform_remove(struct platform_device *pdev)
> return 0;
> }
>
> -static int arche_platform_suspend(struct device *dev)
> +static __maybe_unused int arche_platform_suspend(struct device *dev)
> {
> /*
> * If timing profile premits, we may shutdown bridge
> @@ -629,7 +629,7 @@ static int arche_platform_suspend(struct device *dev)
> return 0;
> }
>
> -static int arche_platform_resume(struct device *dev)
> +static __maybe_unused int arche_platform_resume(struct device *dev)
> {
> /*
> * Atleast for ES2 we have to meet the delay requirement between
Is __maybe_unused the more preferred way than putting these routines
under CONFIG_PM_SLEEP ifdef ?
--
viresh
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| From | Arnd Bergmann <arnd@arndb.de> |
|---|---|
| Date | 2017-05-18 17:00 +0200 |
| Subject | Re: [greybus-dev] [PATCH] staging: greybus: mark PM functions as __maybe_unused |
| Message-ID | <tIv4e-47X-33@gated-at.bofh.it> |
| In reply to | #1644587 |
On Thu, May 18, 2017 at 4:18 PM, Viresh Kumar <viresh.kumar@linaro.org> wrote:
> On 18-05-17, 15:28, Arnd Bergmann wrote:
>> Enabling the arche platform for compile testing showed a harmless
>> warning with CONFIG_PM=n:
>>
>> drivers/staging/greybus/arche-platform.c:632:12: error: 'arche_platform_resume' defined but not used [-Werror=unused-function]
>> drivers/staging/greybus/arche-platform.c:618:12: error: 'arche_platform_suspend' defined but not used [-Werror=unused-function]
>>
>> This marks the functions as __maybe_unused to shut up the warnings.
>>
>> Fixes: 2eccd4aa19fc ("staging: greybus: enable compile testing of arche driver")
>> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>> ---
>> drivers/staging/greybus/arche-platform.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
>> index 5bce5e039596..eced2d26467b 100644
>> --- a/drivers/staging/greybus/arche-platform.c
>> +++ b/drivers/staging/greybus/arche-platform.c
>> @@ -615,7 +615,7 @@ static int arche_platform_remove(struct platform_device *pdev)
>> return 0;
>> }
>>
>> -static int arche_platform_suspend(struct device *dev)
>> +static __maybe_unused int arche_platform_suspend(struct device *dev)
>> {
>> /*
>> * If timing profile premits, we may shutdown bridge
>> @@ -629,7 +629,7 @@ static int arche_platform_suspend(struct device *dev)
>> return 0;
>> }
>>
>> -static int arche_platform_resume(struct device *dev)
>> +static __maybe_unused int arche_platform_resume(struct device *dev)
>> {
>> /*
>> * Atleast for ES2 we have to meet the delay requirement between
>
> Is __maybe_unused the more preferred way than putting these routines
> under CONFIG_PM_SLEEP ifdef ?
I find that a lot of users get the #ifdef wrong, either using the wrong
macro (CONFIG_PM vs CONFIG_PM_SLEEP) or not using the right
set of functions (e.g. calling a function only from the suspend handler).
The __maybe_unused annotation avoids both problems and also gives
better build time coverage, so that's what I tend to use.
Arnd
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| From | Viresh Kumar <viresh.kumar@linaro.org> |
|---|---|
| Date | 2017-05-19 05:50 +0200 |
| Subject | Re: [greybus-dev] [PATCH] staging: greybus: mark PM functions as __maybe_unused |
| Message-ID | <tIH5o-4Bf-7@gated-at.bofh.it> |
| In reply to | #1644650 |
On 18-05-17, 16:51, Arnd Bergmann wrote: > I find that a lot of users get the #ifdef wrong, either using the wrong > macro (CONFIG_PM vs CONFIG_PM_SLEEP) or not using the right > set of functions (e.g. calling a function only from the suspend handler). > > The __maybe_unused annotation avoids both problems and also gives > better build time coverage, so that's what I tend to use. Thanks for the explanation Arnd. I hope these unused routines will not be part of the binary that gets generated. Right? Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> -- viresh
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| From | Arnd Bergmann <arnd@arndb.de> |
|---|---|
| Date | 2017-05-19 09:00 +0200 |
| Subject | Re: [greybus-dev] [PATCH] staging: greybus: mark PM functions as __maybe_unused |
| Message-ID | <tIK3g-6Oj-5@gated-at.bofh.it> |
| In reply to | #1645178 |
On Fri, May 19, 2017 at 5:40 AM, Viresh Kumar <viresh.kumar@linaro.org> wrote:
> On 18-05-17, 16:51, Arnd Bergmann wrote:
>> I find that a lot of users get the #ifdef wrong, either using the wrong
>> macro (CONFIG_PM vs CONFIG_PM_SLEEP) or not using the right
>> set of functions (e.g. calling a function only from the suspend handler).
>>
>> The __maybe_unused annotation avoids both problems and also gives
>> better build time coverage, so that's what I tend to use.
>
> Thanks for the explanation Arnd. I hope these unused routines will not
> be part of the binary that gets generated. Right?
Correct. Ancient compilers (gcc-4.1) had a bug where a function would
still be part of the binary if the only reference to it was from a function
pointer that got dropped through dead code elimination, but that is not
the case here, and those old compilers are not used in real life any more
either.
Arnd
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