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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-11-05 06:50:41 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-11-29 14:48:32 +0300 |
| commit | b350111bf7b3f4a780d28c44f18f7c9fcbe6d11b (patch) | |
| tree | 0ad70789f90058a0fe658a7265756af1ad94983b /arch/powerpc/include/asm/cputhreads.h | |
| parent | af3fdce4ab0781ea183107c90de9cbf21d701c54 (diff) | |
| download | linux-b350111bf7b3f4a780d28c44f18f7c9fcbe6d11b.tar.xz | |
powerpc: remove cpu_online_cores_map function
This function builds the cores online map with on-stack cpumasks which
can cause high stack usage with large NR_CPUS.
It is not used in any performance sensitive paths, so instead just check
for first thread sibling.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Tested-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211105035042.1398309-1-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/include/asm/cputhreads.h')
| -rw-r--r-- | arch/powerpc/include/asm/cputhreads.h | 33 |
1 files changed, 0 insertions, 33 deletions
diff --git a/arch/powerpc/include/asm/cputhreads.h b/arch/powerpc/include/asm/cputhreads.h index b167186aaee4..f26c430f3982 100644 --- a/arch/powerpc/include/asm/cputhreads.h +++ b/arch/powerpc/include/asm/cputhreads.h @@ -32,44 +32,11 @@ extern cpumask_t threads_core_mask; #define threads_core_mask (*get_cpu_mask(0)) #endif -/* cpu_thread_mask_to_cores - Return a cpumask of one per cores - * hit by the argument - * - * @threads: a cpumask of online threads - * - * This function returns a cpumask which will have one online cpu's - * bit set for each core that has at least one thread set in the argument. - * - * This can typically be used for things like IPI for tlb invalidations - * since those need to be done only once per core/TLB - */ -static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads) -{ - cpumask_t tmp, res; - int i, cpu; - - cpumask_clear(&res); - for (i = 0; i < NR_CPUS; i += threads_per_core) { - cpumask_shift_left(&tmp, &threads_core_mask, i); - if (cpumask_intersects(threads, &tmp)) { - cpu = cpumask_next_and(-1, &tmp, cpu_online_mask); - if (cpu < nr_cpu_ids) - cpumask_set_cpu(cpu, &res); - } - } - return res; -} - static inline int cpu_nr_cores(void) { return nr_cpu_ids >> threads_shift; } -static inline cpumask_t cpu_online_cores_map(void) -{ - return cpu_thread_mask_to_cores(cpu_online_mask); -} - #ifdef CONFIG_SMP int cpu_core_index_of_thread(int cpu); int cpu_first_thread_of_core(int core); |