There's a common case where we want any online cpu except a particular
one. This creates a helper to do that, otherwise we need a temp var
and cpumask_andnot().
From: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Mike Travis <travis@xxxxxxx>
---
include/linux/cpumask.h | 3 +++
lib/cpumask.c | 10 ++++++++++
2 files changed, 13 insertions(+)
--- test-compile.orig/include/linux/cpumask.h
+++ test-compile/include/linux/cpumask.h
@@ -111,6 +111,7 @@
*
* int cpumask_any(mask) Any cpu in mask
* int cpumask_any_and(mask1,mask2) Any cpu in both masks
+ * int cpumask_any_but(mask,cpu) Any cpu in mask except cpu
*
* for_each_possible_cpu(cpu) for-loop cpu over cpu_possible_map
* for_each_online_cpu(cpu) for-loop cpu over cpu_online_map
@@ -458,6 +459,7 @@ extern cpumask_t cpu_mask_all;
#define cpumask_first(src) ({ (void)(src); 0; })
#define cpumask_next(n, src) ({ (void)(src); 1; })
#define cpumask_next_and(n, srcp, andp) ({ (void)(srcp), (void)(andp); 1; })
+#define cpumask_any_but(mask, cpu) ({ (void)(mask); (void)(cpu); 0; })
#define for_each_cpu(cpu, mask) \
for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
@@ -469,6 +471,7 @@ extern cpumask_t cpu_mask_all;
int cpumask_first(const cpumask_t *srcp);
int cpumask_next(int n, const cpumask_t *srcp);
int cpumask_next_and(int n, const cpumask_t *srcp, const cpumask_t *andp);
+int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
#define for_each_cpu(cpu, mask) \
for ((cpu) = -1; \
--- test-compile.orig/lib/cpumask.c
+++ test-compile/lib/cpumask.c
@@ -24,6 +24,16 @@ int cpumask_next_and(int n, const cpumas
}
EXPORT_SYMBOL(cpumask_next_and);
+int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
+{
+ unsigned int i;
+
+ for_each_cpu(i, mask)
+ if (i != cpu)
+ break;
+ return i;
+}
+
/* These are not inline because of header tangles. */
#ifdef CONFIG_CPUMASK_OFFSTACK
bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
--
--
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