diff mbox series

[2/9] cpumask: introduce cpumask_nth_and_andnot

Message ID 20230121042436.2661843-3-yury.norov@gmail.com (mailing list archive)
State Accepted
Commit 62f4386e564d31c7d0ed7d835843e2685f99ae71
Delegated to: Netdev Maintainers
Headers show
Series sched: cpumask: improve on cpumask_local_spread() locality | expand

Checks

Context Check Description
netdev/tree_selection success Guessed tree name to be net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 17666 this patch: 17666
netdev/cc_maintainers success CCed 3 of 3 maintainers
netdev/build_clang success Errors and warnings before: 4200 this patch: 4200
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 18573 this patch: 18573
netdev/checkpatch warning CHECK: Alignment should match open parenthesis WARNING: line length of 82 exceeds 80 columns WARNING: line length of 84 exceeds 80 columns WARNING: line length of 89 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 8 this patch: 8
netdev/source_inline success Was 0 now: 0

Commit Message

Yury Norov Jan. 21, 2023, 4:24 a.m. UTC 
Introduce cpumask_nth_and_andnot() based on find_nth_and_andnot_bit().
It's used in the following patch to traverse cpumasks without storing
intermediate result in temporary cpumask.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Acked-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Peter Lafreniere <peter@n8pjl.ca>
---
 include/linux/cpumask.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index c2aa0aa26b45..7b16aede7ac5 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -391,6 +391,26 @@  unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1,
 				nr_cpumask_bits, cpumask_check(cpu));
 }
 
+/**
+ * cpumask_nth_and_andnot - get the Nth cpu set in 1st and 2nd cpumask, and clear in 3rd.
+ * @srcp1: the cpumask pointer
+ * @srcp2: the cpumask pointer
+ * @srcp3: the cpumask pointer
+ * @cpu: the N'th cpu to find, starting from 0
+ *
+ * Returns >= nr_cpu_ids if such cpu doesn't exist.
+ */
+static __always_inline
+unsigned int cpumask_nth_and_andnot(unsigned int cpu, const struct cpumask *srcp1,
+							const struct cpumask *srcp2,
+							const struct cpumask *srcp3)
+{
+	return find_nth_and_andnot_bit(cpumask_bits(srcp1),
+					cpumask_bits(srcp2),
+					cpumask_bits(srcp3),
+					nr_cpumask_bits, cpumask_check(cpu));
+}
+
 #define CPU_BITS_NONE						\
 {								\
 	[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL			\