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From:   Yuri Norov <ynorov@marvell.com>
To:     Andrew Morton <akpm@linux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
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CC:     Yuri Norov <ynorov@marvell.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH 1/4] bitmap_parselist: don't calculate length of the input
 string
Thread-Topic: [PATCH 1/4] bitmap_parselist: don't calculate length of the
 input string
Thread-Index: AQHUmqQfrA6xn2nAj0yLIRPgzAZ/tw==
Date:   Sun, 23 Dec 2018 09:44:39 +0000
Message-ID: <20181223094422.4849-2-ynorov@marvell.com>
References: <20181223094422.4849-1-ynorov@marvell.com>
In-Reply-To: <20181223094422.4849-1-ynorov@marvell.com>
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bitmap_parselist() calculates length of the input string before passing
it to the __bitmap_parselist(). But the end-of-line condition is checked
for every character in __bitmap_parselist() anyway. So doing it in wrapper
is a simple waste of time.

Signed-off-by: Yury Norov <ynorov@marvell.com>
---
 lib/bitmap.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/lib/bitmap.c b/lib/bitmap.c
index eead55aa7170..ad43ba397c58 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -614,10 +614,7 @@ static int __bitmap_parselist(const char *buf, unsigne=
d int buflen,
=20
 int bitmap_parselist(const char *bp, unsigned long *maskp, int nmaskbits)
 {
-	char *nl  =3D strchrnul(bp, '\n');
-	int len =3D nl - bp;
-
-	return __bitmap_parselist(bp, len, 0, maskp, nmaskbits);
+	return __bitmap_parselist(bp, UINT_MAX, 0, maskp, nmaskbits);
 }
 EXPORT_SYMBOL(bitmap_parselist);
=20
--=20
2.17.1