[tip: core/rcu] lib: bitmap: move ERANGE check from set_region to check_region

[tip-bot2 for Paul Gortmaker]

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     f3c869caef648c541a7445f2a6ba2196d343f542
Gitweb:        
https://git.kernel.org/tip/f3c869caef648c541a7445f2a6ba2196d343f542
Author:        Paul Gortmaker <paul.gortma...@windriver.com>
AuthorDate:    Sun, 21 Feb 2021 03:08:24 -05:00
Committer:     Paul E. McKenney <paul...@kernel.org>
CommitterDate: Mon, 08 Mar 2021 14:16:58 -08:00

lib: bitmap: move ERANGE check from set_region to check_region

It makes sense to do all the checks in check_region() and not 1/2
in check_region and 1/2 in set_region.

Since set_region is called immediately after check_region, the net
effect on runtime is zero, but it gets rid of an if (...) return...

Cc: Yury Norov <yury.no...@gmail.com>
Cc: Rasmus Villemoes <li...@rasmusvillemoes.dk>
Cc: Andy Shevchenko <andriy.shevche...@linux.intel.com>
Acked-by: Yury Norov <yury.no...@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
Signed-off-by: Paul Gortmaker <paul.gortma...@windriver.com>
Signed-off-by: Paul E. McKenney <paul...@kernel.org>
---
 lib/bitmap.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/lib/bitmap.c b/lib/bitmap.c
index 162e285..833f152 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -500,17 +500,12 @@ struct region {
        unsigned int nbits;
 };
 
-static int bitmap_set_region(const struct region *r, unsigned long *bitmap)
+static void bitmap_set_region(const struct region *r, unsigned long *bitmap)
 {
        unsigned int start;
 
-       if (r->end >= r->nbits)
-               return -ERANGE;
-
        for (start = r->start; start <= r->end; start += r->group_len)
                bitmap_set(bitmap, start, min(r->end - start + 1, r->off));
-
-       return 0;
 }
 
 static int bitmap_check_region(const struct region *r)
@@ -518,6 +513,9 @@ static int bitmap_check_region(const struct region *r)
        if (r->start > r->end || r->group_len == 0 || r->off > r->group_len)
                return -EINVAL;
 
+       if (r->end >= r->nbits)
+               return -ERANGE;
+
        return 0;
 }
 
@@ -656,9 +654,7 @@ int bitmap_parselist(const char *buf, unsigned long *maskp, 
int nmaskbits)
                if (ret)
                        return ret;
 
-               ret = bitmap_set_region(&r, maskp);
-               if (ret)
-                       return ret;
+               bitmap_set_region(&r, maskp);
        }
 
        return 0;