diff options
Diffstat (limited to 'include/linux/cpumask.h')
| -rw-r--r-- | include/linux/cpumask.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 2997af6d2cc..0a9a6da21e7 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -666,10 +666,19 @@ static inline size_t cpumask_size(void) * * This code makes NR_CPUS length memcopy and brings to a memory corruption. * cpumask_copy() provide safe copy functionality. + * + * Note that there is another evil here: If you define a cpumask_var_t + * as a percpu variable then the way to obtain the address of the cpumask + * structure differently influences what this_cpu_* operation needs to be + * used. Please use this_cpu_cpumask_var_t in those cases. The direct use + * of this_cpu_ptr() or this_cpu_read() will lead to failures when the + * other type of cpumask_var_t implementation is configured. */ #ifdef CONFIG_CPUMASK_OFFSTACK typedef struct cpumask *cpumask_var_t; +#define this_cpu_cpumask_var_ptr(x) this_cpu_read(x) + bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); @@ -681,6 +690,8 @@ void free_bootmem_cpumask_var(cpumask_var_t mask); #else typedef struct cpumask cpumask_var_t[1]; +#define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x) + static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) { return true; |