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authorPeter Zijlstra <peterz@infradead.org>2017-04-14 15:20:05 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-07-21 08:42:23 +0300
commit542ebc96c2004c665a4a6e3d2f2813685f0de7a3 (patch)
tree8739975165856a00fdcd913e5be370e897a44314 /lib
parenta0a93e3e6e1e8c35d1d6cf624f2f74a976ab43d5 (diff)
downloadlinux-542ebc96c2004c665a4a6e3d2f2813685f0de7a3.tar.xz
sched/fair, cpumask: Export for_each_cpu_wrap()
commit c6508a39640b9a27fc2bc10cb708152672c82045 upstream. commit c743f0a5c50f2fcbc628526279cfa24f3dabe182 upstream. More users for for_each_cpu_wrap() have appeared. Promote the construct to generic cpumask interface. The implementation is slightly modified to reduce arguments. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Lauro Ramos Venancio <lvenanci@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: lwang@redhat.com Link: http://lkml.kernel.org/r/20170414122005.o35me2h5nowqkxbv@hirez.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/cpumask.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/lib/cpumask.c b/lib/cpumask.c
index 81dedaab36cc..4731a0895760 100644
--- a/lib/cpumask.c
+++ b/lib/cpumask.c
@@ -43,6 +43,38 @@ int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
}
EXPORT_SYMBOL(cpumask_any_but);
+/**
+ * cpumask_next_wrap - helper to implement for_each_cpu_wrap
+ * @n: the cpu prior to the place to search
+ * @mask: the cpumask pointer
+ * @start: the start point of the iteration
+ * @wrap: assume @n crossing @start terminates the iteration
+ *
+ * Returns >= nr_cpu_ids on completion
+ *
+ * Note: the @wrap argument is required for the start condition when
+ * we cannot assume @start is set in @mask.
+ */
+int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap)
+{
+ int next;
+
+again:
+ next = cpumask_next(n, mask);
+
+ if (wrap && n < start && next >= start) {
+ return nr_cpumask_bits;
+
+ } else if (next >= nr_cpumask_bits) {
+ wrap = true;
+ n = -1;
+ goto again;
+ }
+
+ return next;
+}
+EXPORT_SYMBOL(cpumask_next_wrap);
+
/* These are not inline because of header tangles. */
#ifdef CONFIG_CPUMASK_OFFSTACK
/**