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authorMike Travis <travis@sgi.com>2008-05-12 15:21:12 -0400
committerIngo Molnar <mingo@elte.hu>2008-07-08 05:31:20 -0400
commit23ca4bba3e20c6c3cb11c1bb0ab4770b724d39ac (patch)
tree39ba5f7705e48717d7a6f2621b8ca7e7015c9802 /drivers/base/topology.c
parent1184dc2ffe2c8fb9afb766d870850f2c3165ef25 (diff)
x86: cleanup early per cpu variables/accesses v4
* Introduce a new PER_CPU macro called "EARLY_PER_CPU". This is used by some per_cpu variables that are initialized and accessed before there are per_cpu areas allocated. ["Early" in respect to per_cpu variables is "earlier than the per_cpu areas have been setup".] This patchset adds these new macros: DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) EXPORT_EARLY_PER_CPU_SYMBOL(_name) DECLARE_EARLY_PER_CPU(_type, _name) early_per_cpu_ptr(_name) early_per_cpu_map(_name, _idx) early_per_cpu(_name, _cpu) The DEFINE macro defines the per_cpu variable as well as the early map and pointer. It also initializes the per_cpu variable and map elements to "_initvalue". The early_* macros provide access to the initial map (usually setup during system init) and the early pointer. This pointer is initialized to point to the early map but is then NULL'ed when the actual per_cpu areas are setup. After that the per_cpu variable is the correct access to the variable. The early_per_cpu() macro is not very efficient but does show how to access the variable if you have a function that can be called both "early" and "late". It tests the early ptr to be NULL, and if not then it's still valid. Otherwise, the per_cpu variable is used instead: #define early_per_cpu(_name, _cpu) \ (early_per_cpu_ptr(_name) ? \ early_per_cpu_ptr(_name)[_cpu] : \ per_cpu(_name, _cpu)) A better method is to actually check the pointer manually. In the case below, numa_set_node can be called both "early" and "late": void __cpuinit numa_set_node(int cpu, int node) { int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map); if (cpu_to_node_map) cpu_to_node_map[cpu] = node; else per_cpu(x86_cpu_to_node_map, cpu) = node; } * Add a flag "arch_provides_topology_pointers" that indicates pointers to topology cpumask_t maps are available. Otherwise, use the function returning the cpumask_t value. This is useful if cpumask_t set size is very large to avoid copying data on to/off of the stack. * The coverage of CONFIG_DEBUG_PER_CPU_MAPS has been increased while the non-debug case has been optimized a bit. * Remove an unreferenced compiler warning in drivers/base/topology.c * Clean up #ifdef in setup.c For inclusion into sched-devel/latest tree. Based on: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git + sched-devel/latest .../mingo/linux-2.6-sched-devel.git Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/base/topology.c')
-rw-r--r--drivers/base/topology.c25
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/base/topology.c b/drivers/base/topology.c
index fdf4044d2e74..1efe162e16d7 100644
--- a/drivers/base/topology.c
+++ b/drivers/base/topology.c
@@ -40,6 +40,7 @@ static ssize_t show_##name(struct sys_device *dev, char *buf) \
40 return sprintf(buf, "%d\n", topology_##name(cpu)); \ 40 return sprintf(buf, "%d\n", topology_##name(cpu)); \
41} 41}
42 42
43#if defined(topology_thread_siblings) || defined(topology_core_siblings)
43static ssize_t show_cpumap(int type, cpumask_t *mask, char *buf) 44static ssize_t show_cpumap(int type, cpumask_t *mask, char *buf)
44{ 45{
45 ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf; 46 ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
@@ -54,21 +55,41 @@ static ssize_t show_cpumap(int type, cpumask_t *mask, char *buf)
54 } 55 }
55 return n; 56 return n;
56} 57}
58#endif
57 59
60#ifdef arch_provides_topology_pointers
58#define define_siblings_show_map(name) \ 61#define define_siblings_show_map(name) \
59static inline ssize_t show_##name(struct sys_device *dev, char *buf) \ 62static ssize_t show_##name(struct sys_device *dev, char *buf) \
60{ \ 63{ \
61 unsigned int cpu = dev->id; \ 64 unsigned int cpu = dev->id; \
62 return show_cpumap(0, &(topology_##name(cpu)), buf); \ 65 return show_cpumap(0, &(topology_##name(cpu)), buf); \
63} 66}
64 67
65#define define_siblings_show_list(name) \ 68#define define_siblings_show_list(name) \
66static inline ssize_t show_##name##_list(struct sys_device *dev, char *buf) \ 69static ssize_t show_##name##_list(struct sys_device *dev, char *buf) \
67{ \ 70{ \
68 unsigned int cpu = dev->id; \ 71 unsigned int cpu = dev->id; \
69 return show_cpumap(1, &(topology_##name(cpu)), buf); \ 72 return show_cpumap(1, &(topology_##name(cpu)), buf); \
70} 73}
71 74
75#else
76#define define_siblings_show_map(name) \
77static ssize_t show_##name(struct sys_device *dev, char *buf) \
78{ \
79 unsigned int cpu = dev->id; \
80 cpumask_t mask = topology_##name(cpu); \
81 return show_cpumap(0, &mask, buf); \
82}
83
84#define define_siblings_show_list(name) \
85static ssize_t show_##name##_list(struct sys_device *dev, char *buf) \
86{ \
87 unsigned int cpu = dev->id; \
88 cpumask_t mask = topology_##name(cpu); \
89 return show_cpumap(1, &mask, buf); \
90}
91#endif
92
72#define define_siblings_show_func(name) \ 93#define define_siblings_show_func(name) \
73 define_siblings_show_map(name); define_siblings_show_list(name) 94 define_siblings_show_map(name); define_siblings_show_list(name)
74 95