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Mon, 18 Jun 2018 16:10:04 +0300 (EEST) From: Andy Shevchenko To: Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, Shaohua Li , linux-raid@vger.kernel.org, Dmitry Torokhov , linux-input@vger.kernel.org, Andrew Morton , Yury Norov , linux-kernel@vger.kernel.org, mika.westerberg@linux.intel.com, Joe Perches Date: Mon, 18 Jun 2018 16:10:01 +0300 Message-Id: <20180618131003.88110-4-andriy.shevchenko@linux.intel.com> In-Reply-To: <20180618131003.88110-1-andriy.shevchenko@linux.intel.com> References: <20180618131003.88110-1-andriy.shevchenko@linux.intel.com> X-Greylist: Sender passed SPF test, Sender IP whitelisted by DNSRBL, ACL 207 matched, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Mon, 18 Jun 2018 13:10:07 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Mon, 18 Jun 2018 13:10:07 +0000 (UTC) for IP:'192.55.52.115' DOMAIN:'mga14.intel.com' HELO:'mga14.intel.com' FROM:'andriy.shevchenko@linux.intel.com' RCPT:'' X-RedHat-Spam-Score: -5 (RCVD_IN_DNSWL_HI) 192.55.52.115 mga14.intel.com 192.55.52.115 mga14.intel.com X-Scanned-By: MIMEDefang 2.78 on 10.5.110.29 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-loop: dm-devel@redhat.com X-Mailman-Approved-At: Tue, 19 Jun 2018 03:05:04 -0400 Cc: Andy Shevchenko Subject: [dm-devel] [PATCH v3 3/5] bitmap: Add bitmap_alloc(), bitmap_zalloc() and bitmap_free() X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.84 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Tue, 19 Jun 2018 07:05:09 +0000 (UTC) X-Virus-Scanned: ClamAV using ClamSMTP A lot of code become ugly because of open coding allocations for bitmaps. Introduce three helpers to allow users be more clear of intention and keep their code neat. Signed-off-by: Andy Shevchenko --- include/linux/bitmap.h | 8 ++++++++ lib/bitmap.c | 19 +++++++++++++++++++ 2 files changed, 27 insertions(+) diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 1ee46f492267..acf5e8df3504 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -104,6 +104,14 @@ * contain all bit positions from 0 to 'bits' - 1. */ +/* + * Allocation and deallocation of bitmap. + * Provided in lib/bitmap.c to avoid circular dependency. + */ +extern unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags); +extern unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags); +extern void bitmap_free(const unsigned long *bitmap); + /* * lib/bitmap.c provides these functions: */ diff --git a/lib/bitmap.c b/lib/bitmap.c index 33e95cd359a2..09acf2fd6a35 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -1125,6 +1126,24 @@ void bitmap_copy_le(unsigned long *dst, const unsigned long *src, unsigned int n EXPORT_SYMBOL(bitmap_copy_le); #endif +unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags) +{ + return kmalloc_array(BITS_TO_LONGS(nbits), sizeof(unsigned long), flags); +} +EXPORT_SYMBOL(bitmap_alloc); + +unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags) +{ + return bitmap_alloc(nbits, flags | __GFP_ZERO); +} +EXPORT_SYMBOL(bitmap_zalloc); + +void bitmap_free(const unsigned long *bitmap) +{ + kfree(bitmap); +} +EXPORT_SYMBOL(bitmap_free); + #if BITS_PER_LONG == 64 /** * bitmap_from_arr32 - copy the contents of u32 array of bits to bitmap