From: Paul Gortmaker <paul.gortmaker@windriver.com> To: linux-kernel@vger.kernel.org Cc: lizefan@huawei.com, mingo@kernel.org, tglx@linutronix.de, josh@joshtriplett.org, yury.norov@gmail.com, peterz@infradead.org, paulmck@kernel.org, fweisbec@gmail.com, linux@rasmusvillemoes.dk, andriy.shevchenko@linux.intel.com, Paul Gortmaker <paul.gortmaker@windriver.com> Subject: [PATCH 4/8] lib: bitmap: move ERANGE check from set_region to check_region Date: Tue, 26 Jan 2021 12:11:37 -0500 [thread overview] Message-ID: <20210126171141.122639-5-paul.gortmaker@windriver.com> (raw) In-Reply-To: <20210126171141.122639-1-paul.gortmaker@windriver.com> 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.norov@gmail.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> --- lib/bitmap.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/lib/bitmap.c b/lib/bitmap.c index 162e2850c622..833f152a2c43 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; -- 2.17.1
next prev parent reply other threads:[~2021-01-27 0:28 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-26 17:11 [PATCH v3 0/8] support for bitmap (and hence CPU) list "N" abbreviation Paul Gortmaker 2021-01-26 17:11 ` [PATCH 1/8] lib: test_bitmap: clearly separate ERANGE from EINVAL tests Paul Gortmaker 2021-01-26 21:04 ` Andy Shevchenko 2021-01-27 7:21 ` Paul Gortmaker 2021-01-26 17:11 ` [PATCH 2/8] lib: test_bitmap: add more start-end:offset/len tests Paul Gortmaker 2021-01-26 21:11 ` Andy Shevchenko 2021-01-27 3:03 ` Yury Norov 2021-01-26 17:11 ` [PATCH 3/8] lib: bitmap: fold nbits into region struct Paul Gortmaker 2021-01-26 21:16 ` Andy Shevchenko 2021-01-26 21:18 ` Andy Shevchenko 2021-01-27 8:02 ` Paul Gortmaker 2021-01-28 0:47 ` Yury Norov 2021-01-28 10:17 ` Andy Shevchenko 2021-01-27 3:08 ` Yury Norov 2021-01-26 17:11 ` Paul Gortmaker [this message] 2021-01-26 21:19 ` [PATCH 4/8] lib: bitmap: move ERANGE check from set_region to check_region Andy Shevchenko 2021-01-27 3:12 ` Yury Norov 2021-01-26 17:11 ` [PATCH 5/8] lib: bitmap_getnum: separate arg into region and field Paul Gortmaker 2021-01-26 21:23 ` Andy Shevchenko 2021-01-27 2:58 ` Yury Norov 2021-01-27 8:38 ` Paul Gortmaker 2021-01-26 17:11 ` [PATCH 6/8] lib: bitmap: support "N" as an alias for size of bitmap Paul Gortmaker 2021-01-26 21:37 ` Andy Shevchenko 2021-01-26 21:41 ` Andy Shevchenko 2021-01-27 17:57 ` Yury Norov 2021-01-27 8:20 ` Paul Gortmaker 2021-01-26 17:11 ` [PATCH 7/8] lib: test_bitmap: add tests for "N" alias Paul Gortmaker 2021-01-26 17:11 ` [PATCH 8/8] rcu: deprecate "all" option to rcu_nocbs= Paul Gortmaker 2021-01-26 21:36 ` Yury Norov 2021-01-26 22:17 ` Paul E. McKenney 2021-01-26 22:27 ` [PATCH v3 0/8] support for bitmap (and hence CPU) list "N" abbreviation Yury Norov 2021-01-27 9:12 ` Paul Gortmaker 2021-02-09 22:58 [PATCH v4 " Paul Gortmaker 2021-02-09 22:59 ` [PATCH 4/8] lib: bitmap: move ERANGE check from set_region to check_region Paul Gortmaker 2021-02-10 16:28 ` Andy Shevchenko
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