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authorYury Norov <yury.norov@gmail.com>2021-04-20 20:13:25 -0700
committerPaul E. McKenney <paulmck@kernel.org>2021-05-10 15:38:20 -0700
commitb18def121f077857ccf92fc620366e19850bc297 (patch)
treeb19cef760cf5a2e53c37633b6cfb365c75c6abac /lib/bitmap.c
parent6efb943b8616ec53a5e444193dccf1af9ad627b5 (diff)
bitmap_parse: Support 'all' semantics
RCU code supports an 'all' group as a special case when parsing rcu_nocbs parameter. This patch moves the 'all' support to the core bitmap_parse code, so that all bitmap users can enjoy this extension. Moving 'all' parsing to a bitmap_parse level also allows users to pass patterns together with 'all' in regular group:pattern format, for example, "rcu_nocbs=all:1/2" would offload all the even-numbered CPUs regardless of the number of CPUs on the system. Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Yury Norov <yury.norov@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'lib/bitmap.c')
-rw-r--r--lib/bitmap.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 74ceb02f45e3..6e29b2aae6ba 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -581,6 +581,14 @@ static const char *bitmap_parse_region(const char *str, struct region *r)
{
unsigned int lastbit = r->nbits - 1;
+ if (!strncasecmp(str, "all", 3)) {
+ r->start = 0;
+ r->end = lastbit;
+ str += 3;
+
+ goto check_pattern;
+ }
+
str = bitmap_getnum(str, &r->start, lastbit);
if (IS_ERR(str))
return str;
@@ -595,6 +603,7 @@ static const char *bitmap_parse_region(const char *str, struct region *r)
if (IS_ERR(str))
return str;
+check_pattern:
if (end_of_region(*str))
goto no_pattern;