| Message ID | 1462016049-1976580-1-git-send-email-arnd@arndb.de (mailing list archive) |
|---|---|
| State | Accepted, archived |
| Delegated to: | Rafael Wysocki |
| Headers | show |
On Sat 2016-04-30 13:33:29, Arnd Bergmann wrote: > The new use of dev_pm_opp_set_sharing_cpus resulted in a harmless compiler > warning with CONFIG_CPUMASK_OFFSTACK=y: > > drivers/cpufreq/mvebu-cpufreq.c: In function 'armada_xp_pmsu_cpufreq_init': > include/linux/cpumask.h:550:25: error: passing argument 2 of 'dev_pm_opp_set_sharing_cpus' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers] > > The problem here is that cpumask_var_t gets passed by reference, but > by declaring a 'const cpumask_var_t' argument, only the pointer is > constant, not the actual mask. This is harmless because the function > does not actually modify the mask. > > This patch changes the function prototypes for all of the related functions > to pass a 'struct cpumask *' instead of 'cpumask_var_t', matching what > most other such functions do in the kernel. This lets us mark all the > other similar functions as taking a 'const' mask where possible, > and it avoids the warning without any change in object code. > > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > Fixes: 947bd567f7a5 ("mvebu: Use dev_pm_opp_set_sharing_cpus() to mark OPP tables as shared") Acked-by: Pavel Machek <pavel@ucw.cz> (Hiding pointer into cpumask_var_t looks wrong to me, regardless of const issues).
On 30-04-16, 13:33, Arnd Bergmann wrote: > The new use of dev_pm_opp_set_sharing_cpus resulted in a harmless compiler > warning with CONFIG_CPUMASK_OFFSTACK=y: > > drivers/cpufreq/mvebu-cpufreq.c: In function 'armada_xp_pmsu_cpufreq_init': > include/linux/cpumask.h:550:25: error: passing argument 2 of 'dev_pm_opp_set_sharing_cpus' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers] > > The problem here is that cpumask_var_t gets passed by reference, but > by declaring a 'const cpumask_var_t' argument, only the pointer is > constant, not the actual mask. This is harmless because the function > does not actually modify the mask. > > This patch changes the function prototypes for all of the related functions > to pass a 'struct cpumask *' instead of 'cpumask_var_t', matching what > most other such functions do in the kernel. This lets us mark all the > other similar functions as taking a 'const' mask where possible, > and it avoids the warning without any change in object code. > > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > Fixes: 947bd567f7a5 ("mvebu: Use dev_pm_opp_set_sharing_cpus() to mark OPP tables as shared") > --- > drivers/base/power/opp/cpu.c | 10 +++++----- > include/linux/pm_opp.h | 20 ++++++++++---------- > 2 files changed, 15 insertions(+), 15 deletions(-) Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
On 04/30/2016 04:33 AM, Arnd Bergmann wrote: > The new use of dev_pm_opp_set_sharing_cpus resulted in a harmless compiler > warning with CONFIG_CPUMASK_OFFSTACK=y: > > drivers/cpufreq/mvebu-cpufreq.c: In function 'armada_xp_pmsu_cpufreq_init': > include/linux/cpumask.h:550:25: error: passing argument 2 of 'dev_pm_opp_set_sharing_cpus' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers] > > The problem here is that cpumask_var_t gets passed by reference, but > by declaring a 'const cpumask_var_t' argument, only the pointer is > constant, not the actual mask. This is harmless because the function > does not actually modify the mask. > > This patch changes the function prototypes for all of the related functions > to pass a 'struct cpumask *' instead of 'cpumask_var_t', matching what > most other such functions do in the kernel. This lets us mark all the > other similar functions as taking a 'const' mask where possible, > and it avoids the warning without any change in object code. > > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > Fixes: 947bd567f7a5 ("mvebu: Use dev_pm_opp_set_sharing_cpus() to mark OPP tables as shared") > --- > Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
On Saturday, April 30, 2016 01:33:29 PM Arnd Bergmann wrote: > The new use of dev_pm_opp_set_sharing_cpus resulted in a harmless compiler > warning with CONFIG_CPUMASK_OFFSTACK=y: > > drivers/cpufreq/mvebu-cpufreq.c: In function 'armada_xp_pmsu_cpufreq_init': > include/linux/cpumask.h:550:25: error: passing argument 2 of 'dev_pm_opp_set_sharing_cpus' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers] > > The problem here is that cpumask_var_t gets passed by reference, but > by declaring a 'const cpumask_var_t' argument, only the pointer is > constant, not the actual mask. This is harmless because the function > does not actually modify the mask. > > This patch changes the function prototypes for all of the related functions > to pass a 'struct cpumask *' instead of 'cpumask_var_t', matching what > most other such functions do in the kernel. This lets us mark all the > other similar functions as taking a 'const' mask where possible, > and it avoids the warning without any change in object code. > > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > Fixes: 947bd567f7a5 ("mvebu: Use dev_pm_opp_set_sharing_cpus() to mark OPP tables as shared") Applied with all the ACKs, thanks! -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c index 3428380dfca7..8e0b6349d7d4 100644 --- a/drivers/base/power/opp/cpu.c +++ b/drivers/base/power/opp/cpu.c @@ -132,7 +132,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -void dev_pm_opp_of_cpumask_remove_table(cpumask_var_t cpumask) +void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) { struct device *cpu_dev; int cpu; @@ -164,7 +164,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -int dev_pm_opp_of_cpumask_add_table(cpumask_var_t cpumask) +int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) { struct device *cpu_dev; int cpu, ret = 0; @@ -217,7 +217,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) +int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) { struct device_node *np, *tmp_np; struct device *tcpu_dev; @@ -288,7 +288,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); * mutex cannot be locked. */ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, - const cpumask_var_t cpumask) + const struct cpumask *cpumask) { struct opp_device *opp_dev; struct opp_table *opp_table; @@ -346,7 +346,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) +int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) { struct opp_device *opp_dev; struct opp_table *opp_table; diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 15f554443b59..5221d259e413 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -65,8 +65,8 @@ void dev_pm_opp_put_prop_name(struct device *dev); int dev_pm_opp_set_regulator(struct device *dev, const char *name); void dev_pm_opp_put_regulator(struct device *dev); int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq); -int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const cpumask_var_t cpumask); -int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask); +int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask); +int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask); #else static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) { @@ -180,12 +180,12 @@ static inline int dev_pm_opp_set_rate(struct device *dev, unsigned long target_f return -ENOTSUPP; } -static inline int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const cpumask_var_t cpumask) +static inline int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask) { return -ENOTSUPP; } -static inline int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) +static inline int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) { return -EINVAL; } @@ -195,9 +195,9 @@ static inline int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, cpumask_va #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF) int dev_pm_opp_of_add_table(struct device *dev); void dev_pm_opp_of_remove_table(struct device *dev); -int dev_pm_opp_of_cpumask_add_table(cpumask_var_t cpumask); -void dev_pm_opp_of_cpumask_remove_table(cpumask_var_t cpumask); -int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask); +int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask); +void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask); +int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask); #else static inline int dev_pm_opp_of_add_table(struct device *dev) { @@ -208,16 +208,16 @@ static inline void dev_pm_opp_of_remove_table(struct device *dev) { } -static inline int dev_pm_opp_of_cpumask_add_table(cpumask_var_t cpumask) +static inline int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) { return -ENOTSUPP; } -static inline void dev_pm_opp_of_cpumask_remove_table(cpumask_var_t cpumask) +static inline void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) { } -static inline int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) +static inline int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) { return -ENOTSUPP; }
The new use of dev_pm_opp_set_sharing_cpus resulted in a harmless compiler warning with CONFIG_CPUMASK_OFFSTACK=y: drivers/cpufreq/mvebu-cpufreq.c: In function 'armada_xp_pmsu_cpufreq_init': include/linux/cpumask.h:550:25: error: passing argument 2 of 'dev_pm_opp_set_sharing_cpus' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers] The problem here is that cpumask_var_t gets passed by reference, but by declaring a 'const cpumask_var_t' argument, only the pointer is constant, not the actual mask. This is harmless because the function does not actually modify the mask. This patch changes the function prototypes for all of the related functions to pass a 'struct cpumask *' instead of 'cpumask_var_t', matching what most other such functions do in the kernel. This lets us mark all the other similar functions as taking a 'const' mask where possible, and it avoids the warning without any change in object code. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: 947bd567f7a5 ("mvebu: Use dev_pm_opp_set_sharing_cpus() to mark OPP tables as shared") --- drivers/base/power/opp/cpu.c | 10 +++++----- include/linux/pm_opp.h | 20 ++++++++++---------- 2 files changed, 15 insertions(+), 15 deletions(-)