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cpumask: Relax cpumask_any_but()

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Similarly to other cpumask search functions, accept -1, and consider it as
'any CPU' hint. This helps users to avoid coding special cases.

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@gmail.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: James Morse <james.morse@arm.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Link: https://lore.kernel.org/20250515165855.31452-2-james.morse@arm.com
This commit is contained in:
Yury Norov [NVIDIA] 2025-05-15 16:58:31 +00:00 committed by Borislav Petkov (AMD)
parent 82f2b0b97b
commit 189572bf4e
1 changed files with 12 additions and 4 deletions
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16
include/linux/cpumask.h
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@ -413,14 +413,18 @@ unsigned int cpumask_next_wrap(int n, const struct cpumask *src)
* @cpu: the cpu to ignore.
*
* Often used to find any cpu but smp_processor_id() in a mask.
* If @cpu == -1, the function is equivalent to cpumask_any().
* Return: >= nr_cpu_ids if no cpus set.
*/
static __always_inline
unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
unsigned int cpumask_any_but(const struct cpumask *mask, int cpu)
{
unsigned int i;
cpumask_check(cpu);
/* -1 is a legal arg here. */
if (cpu != -1)
cpumask_check(cpu);
for_each_cpu(i, mask)
if (i != cpu)
break;
@ -433,16 +437,20 @@ unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
* @mask2: the second input cpumask
* @cpu: the cpu to ignore
*
* If @cpu == -1, the function is equivalent to cpumask_any_and().
* Returns >= nr_cpu_ids if no cpus set.
*/
static __always_inline
unsigned int cpumask_any_and_but(const struct cpumask *mask1,
const struct cpumask *mask2,
unsigned int cpu)
int cpu)
{
unsigned int i;
cpumask_check(cpu);
/* -1 is a legal arg here. */
if (cpu != -1)
cpumask_check(cpu);
i = cpumask_first_and(mask1, mask2);
if (i != cpu)
return i;