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authorVaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>2010-10-06 08:36:59 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-11-29 15:48:19 +1100
commit99d86705253dcf728dbbec4d694a6764b6edb70c (patch)
treee4c68adab6448463a77141c1797671417f58242c /arch/powerpc/mm
parent787d44caa5bca249d8781d21b626c417f1e3cfc4 (diff)
downloadlinaro-lsk-99d86705253dcf728dbbec4d694a6764b6edb70c.tar.gz
powerpc: Cleanup APIs for cpu/thread/core mappings
These APIs take logical cpu number as input Change cpu_first_thread_in_core() to cpu_first_thread_sibling() Change cpu_last_thread_in_core() to cpu_last_thread_sibling() These APIs convert core number (index) to logical cpu/thread numbers Add cpu_first_thread_of_core(int core) Changed cpu_thread_to_core() to cpu_core_index_of_thread(int cpu) The goal is to make 'threads_per_core' accessible to the pseries_energy module. Instead of making an API to read threads_per_core, this is a higher level wrapper function to convert from logical cpu number to core number. The current APIs cpu_first_thread_in_core() and cpu_last_thread_in_core() returns logical CPU number while cpu_thread_to_core() returns core number or index which is not a logical CPU number. The new APIs are now clearly named to distinguish 'core number' versus first and last 'logical cpu number' in that core. The new APIs cpu_{first,last}_thread_sibling() work on logical cpu numbers. While cpu_first_thread_of_core() and cpu_core_index_of_thread() work on core index. Example usage: (4 threads per core system) cpu_first_thread_sibling(5) = 4 cpu_last_thread_sibling(5) = 7 cpu_core_index_of_thread(5) = 1 cpu_first_thread_of_core(1) = 4 cpu_core_index_of_thread() is used in cpu_to_drc_index() in the module and cpu_first_thread_of_core() is used in drc_index_to_cpu() in the module. Make API changes to few callers. Export symbols for use in modules. Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm')
-rw-r--r--arch/powerpc/mm/mmu_context_nohash.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/powerpc/mm/mmu_context_nohash.c b/arch/powerpc/mm/mmu_context_nohash.c
index 5ce99848d91..c0aab52da3a 100644
--- a/arch/powerpc/mm/mmu_context_nohash.c
+++ b/arch/powerpc/mm/mmu_context_nohash.c
@@ -111,8 +111,8 @@ static unsigned int steal_context_smp(unsigned int id)
* a core map instead but this will do for now.
*/
for_each_cpu(cpu, mm_cpumask(mm)) {
- for (i = cpu_first_thread_in_core(cpu);
- i <= cpu_last_thread_in_core(cpu); i++)
+ for (i = cpu_first_thread_sibling(cpu);
+ i <= cpu_last_thread_sibling(cpu); i++)
__set_bit(id, stale_map[i]);
cpu = i - 1;
}
@@ -264,14 +264,14 @@ void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next)
*/
if (test_bit(id, stale_map[cpu])) {
pr_hardcont(" | stale flush %d [%d..%d]",
- id, cpu_first_thread_in_core(cpu),
- cpu_last_thread_in_core(cpu));
+ id, cpu_first_thread_sibling(cpu),
+ cpu_last_thread_sibling(cpu));
local_flush_tlb_mm(next);
/* XXX This clear should ultimately be part of local_flush_tlb_mm */
- for (i = cpu_first_thread_in_core(cpu);
- i <= cpu_last_thread_in_core(cpu); i++) {
+ for (i = cpu_first_thread_sibling(cpu);
+ i <= cpu_last_thread_sibling(cpu); i++) {
__clear_bit(id, stale_map[i]);
}
}