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Miller" , "Matthew Wilcox (Oracle)" , Andrew Morton , Andrzej Hajda , Danilo Krummrich , Douglas Anderson , Herbert Xu , Jason Gunthorpe , John Allen , Kees Cook , Leon Romanovsky , Madhavan Srinivasan , Marek Szyprowski , Mauro Carvalho Chehab , Michael Ellerman , Nicholas Piggin , Rasmus Villemoes , Tom Lendacky , Yury Norov , linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: Yury Norov , sunyi <279644543@qq.com> Subject: [PATCH 5/5] bitmap: Return size when no zero area is found Date: Wed, 8 Jul 2026 22:03:11 -0400 Message-ID: <20260709020312.133977-6-ynorov@nvidia.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260709020312.133977-1-ynorov@nvidia.com> References: <20260709020312.133977-1-ynorov@nvidia.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BY3PR03CA0027.namprd03.prod.outlook.com (2603:10b6:a03:39a::32) To LV3PR12MB9356.namprd12.prod.outlook.com (2603:10b6:408:20c::21) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV3PR12MB9356:EE_|DS4PR12MB9818:EE_ X-MS-Office365-Filtering-Correlation-Id: 72be6ac1-bdc8-44bb-6773-08dedd5e45ee X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014|23010399003|921020|18002099003|22082099003|11063799006|56012099006; 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This matches the conventional find_bit() failure sentinel and still lets callers detect failure with an out-of-range check. Document the public failure contract as a value greater than or equal to the bitmap size, without requiring callers to depend on the exact sentinel. Signed-off-by: Yury Norov --- include/linux/bitmap.h | 3 +++ lib/bitmap.c | 10 ++++------ 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 8854acf77869..33f175a30304 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -209,6 +209,9 @@ unsigned long bitmap_find_next_zero_area_off(unsigned long *map, * The @align_mask should be one less than a power of 2; the effect is that * the bit offset of all zero areas this function finds is multiples of that * power of 2. A @align_mask of 0 means no alignment is required. + * + * Return: The bit offset of the found area or a value >= @size + * if no area is found. */ static __always_inline unsigned long bitmap_find_next_zero_area(unsigned long *map, diff --git a/lib/bitmap.c b/lib/bitmap.c index b464d843f4eb..ed685127a107 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -424,6 +424,9 @@ EXPORT_SYMBOL(__bitmap_clear); * The @align_mask should be one less than a power of 2; the effect is that * the bit offset of all zero areas this function finds plus @align_offset * is multiple of that power of 2. + * + * Return: The bit offset of the found area or a value greater than or equal + * to @size if no area is found. */ unsigned long bitmap_find_next_zero_area_off(unsigned long *map, unsigned long size, @@ -448,12 +451,7 @@ unsigned long bitmap_find_next_zero_area_off(unsigned long *map, start = i; } - /* - * Here, returning size + 1 is to maintain consistency - * with the old version, where the return value is always - * greater than size when no zero areas are found. - */ - return size + 1; + return size; } EXPORT_SYMBOL(bitmap_find_next_zero_area_off); -- 2.53.0