From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 16CBFD3EE8A for ; Thu, 22 Jan 2026 16:10:28 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 726BF10EA1F; Thu, 22 Jan 2026 16:10:27 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="qSJMMtX1"; dkim-atps=neutral Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by gabe.freedesktop.org (Postfix) with ESMTPS id 864FB10EA1F for ; Thu, 22 Jan 2026 16:10:25 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 062396012B; Thu, 22 Jan 2026 16:10:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 33E87C116C6; Thu, 22 Jan 2026 16:10:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769098224; bh=LmgB3NAOjY2EXb6KKktntFdTHuCI5bomDczMPMk21vQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qSJMMtX17uMId5qnzEFbziYqxYETI2pr51ysG1ENZJyeMwGCFR6aWtyor35a6hgWc mVoKE1PLfg1iqNj5RMwTd2bFk36grxBnFL3n/UH3W3mLyujydUCnh1AipUXW9koOvJ +W2jPRJwvcJ3ttoxIM0ifDKSIp1SMD7ZIDgE+yeiE/2YwprYArt5wBaBa/3ych9p9K YnFlVvo8EJ+W6DWZLfi96vHNYPxnU7SruN3LkQD3J4D+1DKGrN2LHi+PbqyYRQfA7D OEVibrds0rDZaojZuwjLuz5pzbuIGbX/duIVsWXVMWd+HycimpAa4sJmvlp2gUHOnC GxoWgTKQQFPuQ== From: Thierry Reding To: Thierry Reding , David Airlie , Simona Vetter , Sumit Semwal Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Benjamin Gaignard , Brian Starkey , John Stultz , "T . J . Mercier" , Andrew Morton , David Hildenbrand , Mike Rapoport , Sumit Garg , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org Subject: [PATCH v2 03/10] bitmap: Add bitmap_allocate() function Date: Thu, 22 Jan 2026 17:10:02 +0100 Message-ID: <20260122161009.3865888-4-thierry.reding@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260122161009.3865888-1-thierry.reding@kernel.org> References: <20260122161009.3865888-1-thierry.reding@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Thierry Reding This is similar to bitmap_allocate_region() but allows allocation of non-power of two pages/bits. While at it, reimplement bitmap_allocate_region() in terms of this new helper to remove a sliver of code duplication. Signed-off-by: Thierry Reding --- include/linux/bitmap.h | 25 ++++++++++++++++++++----- 1 file changed, 20 insertions(+), 5 deletions(-) diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index b0395e4ccf90..0fc259908262 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -673,10 +673,10 @@ void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order) } /** - * bitmap_allocate_region - allocate bitmap region + * bitmap_allocate - allocate bitmap region * @bitmap: array of unsigned longs corresponding to the bitmap * @pos: beginning of bit region to allocate - * @order: region size (log base 2 of number of bits) to allocate + * @len: number of bits to allocate * * Allocate (set bits in) a specified region of a bitmap. * @@ -684,16 +684,31 @@ void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order) * free (not all bits were zero). */ static __always_inline -int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order) +int bitmap_allocate(unsigned long *bitmap, unsigned int pos, unsigned int len) { - unsigned int len = BIT(order); - if (find_next_bit(bitmap, pos + len, pos) < pos + len) return -EBUSY; bitmap_set(bitmap, pos, len); return 0; } +/** + * bitmap_allocate_region - allocate bitmap region + * @bitmap: array of unsigned longs corresponding to the bitmap + * @pos: beginning of bit region to allocate + * @order: region size (log base 2 of number of bits) to allocate + * + * Allocate (set bits in) a specified region of a bitmap. + * + * Returns: 0 on success, or %-EBUSY if specified region wasn't + * free (not all bits were zero). + */ +static __always_inline +int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order) +{ + return bitmap_allocate(bitmap, pos, BIT(order)); +} + /** * bitmap_find_free_region - find a contiguous aligned mem region * @bitmap: array of unsigned longs corresponding to the bitmap -- 2.52.0