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From: Paul Gortmaker <paul.gortmaker@windriver.com>
To: linux-kernel@vger.kernel.org
Cc: Li Zefan <lizefan@huawei.com>, Ingo Molnar <mingo@kernel.org>,
	Yury Norov <yury.norov@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Josh Triplett <josh@joshtriplett.org>,
	Peter Zijlstra <peterz@infradead.org>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Paul Gortmaker <paul.gortmaker@windriver.com>
Subject: [PATCH 4/8] lib: bitmap: fold nbits into region struct
Date: Sun, 21 Feb 2021 03:08:23 -0500	[thread overview]
Message-ID: <20210221080827.84862-5-paul.gortmaker@windriver.com> (raw)
In-Reply-To: <20210221080827.84862-1-paul.gortmaker@windriver.com>

This will reduce parameter passing and enable using nbits as part
of future dynamic region parameter parsing.

Cc: Yury Norov <yury.norov@gmail.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Suggested-by: Yury Norov <yury.norov@gmail.com>
Acked-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 lib/bitmap.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/lib/bitmap.c b/lib/bitmap.c
index 75006c4036e9..162e2850c622 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -487,24 +487,24 @@ EXPORT_SYMBOL(bitmap_print_to_pagebuf);
 
 /*
  * Region 9-38:4/10 describes the following bitmap structure:
- * 0	   9  12    18			38
- * .........****......****......****......
- *	    ^  ^     ^			 ^
- *      start  off   group_len	       end
+ * 0	   9  12    18			38	     N
+ * .........****......****......****..................
+ *	    ^  ^     ^			 ^	     ^
+ *      start  off   group_len	       end	 nbits
  */
 struct region {
 	unsigned int start;
 	unsigned int off;
 	unsigned int group_len;
 	unsigned int end;
+	unsigned int nbits;
 };
 
-static int bitmap_set_region(const struct region *r,
-				unsigned long *bitmap, int nbits)
+static int bitmap_set_region(const struct region *r, unsigned long *bitmap)
 {
 	unsigned int start;
 
-	if (r->end >= nbits)
+	if (r->end >= r->nbits)
 		return -ERANGE;
 
 	for (start = r->start; start <= r->end; start += r->group_len)
@@ -640,7 +640,8 @@ int bitmap_parselist(const char *buf, unsigned long *maskp, int nmaskbits)
 	struct region r;
 	long ret;
 
-	bitmap_zero(maskp, nmaskbits);
+	r.nbits = nmaskbits;
+	bitmap_zero(maskp, r.nbits);
 
 	while (buf) {
 		buf = bitmap_find_region(buf);
@@ -655,7 +656,7 @@ int bitmap_parselist(const char *buf, unsigned long *maskp, int nmaskbits)
 		if (ret)
 			return ret;
 
-		ret = bitmap_set_region(&r, maskp, nmaskbits);
+		ret = bitmap_set_region(&r, maskp);
 		if (ret)
 			return ret;
 	}
-- 
2.30.0


  parent reply	other threads:[~2021-02-21  8:13 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-21  8:08 [PATCH v5 0/8] support for bitmap (and hence CPU) list "N" abbreviation Paul Gortmaker
2021-02-21  8:08 ` [PATCH 1/8] lib: test_bitmap: clearly separate ERANGE from EINVAL tests Paul Gortmaker
2021-02-21  8:08 ` [PATCH 2/8] lib: test_bitmap: add tests to trigger ERANGE case Paul Gortmaker
2021-02-21  8:08 ` [PATCH 3/8] lib: test_bitmap: add more start-end:offset/len tests Paul Gortmaker
2021-02-21  8:08 ` Paul Gortmaker [this message]
2021-02-21  8:08 ` [PATCH 5/8] lib: bitmap: move ERANGE check from set_region to check_region Paul Gortmaker
2021-02-21  8:08 ` [PATCH 6/8] lib: bitmap: support "N" as an alias for size of bitmap Paul Gortmaker
2021-02-21  8:08 ` [PATCH 7/8] lib: test_bitmap: add tests for "N" alias Paul Gortmaker
2021-02-21  8:08 ` [PATCH 8/8] rcu: deprecate "all" option to rcu_nocbs= Paul Gortmaker
2021-02-22 23:43 ` [PATCH v5 0/8] support for bitmap (and hence CPU) list "N" abbreviation Paul E. McKenney
2021-02-23  1:05 ` Yury Norov
2021-02-24  1:54   ` Paul E. McKenney

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