From mboxrd@z Thu Jan 1 00:00:00 1970 From: linux@roeck-us.net (Guenter Roeck) Date: Wed, 25 Jun 2014 07:27:47 -0700 Subject: [PATCH v2] sched: Fix compiler warnings In-Reply-To: <20140625071416.GM14781@pengutronix.de> References: <1403658329-13196-1-git-send-email-linux@roeck-us.net> <20140625071416.GM14781@pengutronix.de> Message-ID: <53AADC63.8080106@roeck-us.net> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 06/25/2014 12:14 AM, Uwe Kleine-K?nig wrote: > On Tue, Jun 24, 2014 at 06:05:29PM -0700, Guenter Roeck wrote: >> Commit 143e1e28cb (sched: Rework sched_domain topology definition) >> introduced a number of functions with a return value of 'const int'. >> gcc doesn't know what to do with that and, if the kernel is compiled >> with W=1, complains with the following warnings whenever sched.h >> is included. >> >> include/linux/sched.h:875:25: warning: >> type qualifiers ignored on function return type >> include/linux/sched.h:882:25: warning: >> type qualifiers ignored on function return type >> include/linux/sched.h:889:25: warning: >> type qualifiers ignored on function return type >> include/linux/sched.h:1002:21: warning: >> type qualifiers ignored on function return type >> >> Commits fb2aa855 (sched, ARM: Create a dedicated scheduler topology table) >> and 607b45e9a (sched, powerpc: Create a dedicated topology table) introduce >> the same warning in the arm and powerpc code. >> >> Drop 'const' from the function declarations to fix the problem. >> >> The fix for all three patches has to be applied together to avoid >> compilation failures for the affected architectures. >> >> Cc: Dietmar Eggemann >> Cc: Peter Zijlstra >> Cc: Ingo Molnar >> Cc: Benjamin Herrenschmidt >> Cc: Vincent Guittot >> Signed-off-by: Guenter Roeck >> --- >> v2: Fix problem in all affected architectures with a single patch >> to avoid compilation errors. >> >> arch/arm/kernel/topology.c | 2 +- >> arch/powerpc/kernel/smp.c | 2 +- >> include/linux/sched.h | 8 ++++---- >> 3 files changed, 6 insertions(+), 6 deletions(-) >> >> diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c >> index 9d85318..e35d880 100644 >> --- a/arch/arm/kernel/topology.c >> +++ b/arch/arm/kernel/topology.c >> @@ -275,7 +275,7 @@ void store_cpu_topology(unsigned int cpuid) >> cpu_topology[cpuid].socket_id, mpidr); >> } >> >> -static inline const int cpu_corepower_flags(void) >> +static inline int cpu_corepower_flags(void) >> { >> return SD_SHARE_PKG_RESOURCES | SD_SHARE_POWERDOMAIN; >> } > Maybe the author's intention was: > > static inline int cpu_corepower_flags(void) __attribute__((const)); > > ? > This specifies that the function has no side effects and the return value > only depends on the (here non-existing) function arguments. > Possibly, but either I am missing something or this doesn't compile. Guenter