Commit 29f1953d authored Jul 27, 2013 by Hanjun Guo Committed by Greg Kroah-Hartman Jul 29, 2013

cpu topology: remove stale arch_provides_topology_pointers and define_siblings_show_map/list()



arch_provides_topology_pointers was introduced in commit 23ca4bba (x86:
cleanup early per cpu variables/accesses v4) to indicate pointers to the
topology cpumask_t maps are valid to avoid copying data on to/off of the
stack.

But later in commit fbd59a8d (cpumask: Use topology_core_cpumask()/
topology_thread_cpumask()), the pointers to the topology struct cpumask maps
are always valid.

After that commit, the only difference is that there is a redundant
"unsigned int cpu = dev->id;" if arch_provides_topology_pointers defined, but
dev->id is type 'u32' which devolves to 'unsigned int' on all supported arches.
So this arch_provides_topology_pointers define is pointless and only cause
obfuscation now, remove it.

Tested on x86 machine, topology information in sys/devices/system/cpu/
cpuX/topology/ is the same after appling this patch set.

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent f21e6835

drivers/base/topology.c

+0 −20

Original line number	Diff line number	Diff line
		@@ -62,25 +62,6 @@ static ssize_t show_cpumap(int type, const struct cpumask mask, char buf)
		}
		#endif

		#ifdef arch_provides_topology_pointers
		#define define_siblings_show_map(name) \
		static ssize_t show_##name(struct device *dev, \
		struct device_attribute attr, char buf) \
		{ \
		unsigned int cpu = dev->id; \
		return show_cpumap(0, topology_##name(cpu), buf); \
		}

		#define define_siblings_show_list(name) \
		static ssize_t show_##name##_list(struct device *dev, \
		struct device_attribute *attr, \
		char *buf) \
		{ \
		unsigned int cpu = dev->id; \
		return show_cpumap(1, topology_##name(cpu), buf); \
		}

		#else
		#define define_siblings_show_map(name) \
		static ssize_t show_##name(struct device *dev, \
		struct device_attribute attr, char buf) \
		@@ -95,7 +76,6 @@ static ssize_t show_##name##_list(struct device *dev, \
		{ \
		return show_cpumap(1, topology_##name(dev->id), buf); \
		}
		#endif

		#define define_siblings_show_func(name) \
		define_siblings_show_map(name); define_siblings_show_list(name)