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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 40BFDEC01A0 for ; Mon, 23 Mar 2026 07:49:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=zXEwAxCB27G6g1WAOCaJemzlmGEpdOhhDvBG22lnTxs=; b=jgT9mHg7i41QrR13umfz43YXYq 2BG2xo1dDQ7mN3loRbPU6KlWyTb2E5iaKPr5RriqE/qGkQyoj2DyxZnhin+h0tIqng0/wd1hq7IA9 mcv4Z43HRb2R41DJvOo1wIWVlm2LBPmyBwAn85zyB31MOOuwhSrmIuh4+7tNh6Ijm/FjszRK0VcVj 3g2Gc1YcOIBhRZyxxHwFS0SFSkezLNYFO6mqAS8fHm9VLFb+uQYBhV5gIu05G16OpaSndOGeDb111 z/c4HdYB9BrAKAu5Tcw4TNr07S3pHh5WEEuIx2JbHzXp9M+VJ1Rg7oleoduKsF2baG9YXqUj+mDak EtuMSNbg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w4a2F-0000000GDnB-1zIk; Mon, 23 Mar 2026 07:49:15 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w4a2D-0000000GDmg-3PSH for linux-arm-kernel@lists.infradead.org; Mon, 23 Mar 2026 07:49:13 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 06A26600C4; Mon, 23 Mar 2026 07:49:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 161B9C2BC9E; Mon, 23 Mar 2026 07:49:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774252152; bh=IEszaCrFLo/Rs8yG7tIln7RmG7s5ArmJTUt7L+grDBM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mJkHNMOmwoIFLTcd31YucBrDfzfANQW+xkkREf7kQp1YDYI6vfV8/hVhcG3l8g/jK sQngYeWtYhv0ZkW+8RpdtrXoti30446exi6Ju2/Ux3my4Q287Qpr4iWYaKli+PF0u9 vL/UiFYGZsmNZ4bQKMUXEy7AH5R6vF3zaUA3sbrcBu/WMLiPFtPcKLGomrzmqCTzqi PwkOo9OAQEaeopupEyTaQ/a8bAo4WgnB6AuNb75FaxwKNBNMNqccFmqdvaop/ltQA0 aYjKEuyW1vof5rqfOJ6PkR20WHVtA+dub6QcUQQxq3ViDq6QsOyMq2uvJPowcDC5VL AoERA5+OddeHw== From: Mike Rapoport To: Andrew Morton Cc: Alexander Potapenko , Alexander Viro , Andreas Larsson , Ard Biesheuvel , Borislav Petkov , Brendan Jackman , "Christophe Leroy (CS GROUP)" , Catalin Marinas , Christian Brauner , "David S. Miller" , Dave Hansen , David Hildenbrand , Dmitry Vyukov , Ilias Apalodimas , Ingo Molnar , Jan Kara , Johannes Weiner , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Marco Elver , Marek Szyprowski , Masami Hiramatsu , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , "H. Peter Anvin" , Rob Herring , Robin Murphy , Saravana Kannan , Suren Baghdasaryan , Thomas Gleixner , Vlastimil Babka , Will Deacon , Zi Yan , devicetree@vger.kernel.org, iommu@lists.linux.dev, kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-efi@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v2 2/9] powerpc: fadump: pair alloc_pages_exact() with free_pages_exact() Date: Mon, 23 Mar 2026 09:48:29 +0200 Message-ID: <20260323074836.3653702-3-rppt@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260323074836.3653702-1-rppt@kernel.org> References: <20260323074836.3653702-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: "Mike Rapoport (Microsoft)" fadump allocates buffers with alloc_pages_exact(), but then marks them as reserved and frees using free_reserved_area(). This is completely unnecessary and the pages allocated with alloc_pages_exact() can be naturally freed with free_pages_exact(). Replace freeing of memory in fadump_free_buffer() with free_pages_exact() and simplify allocation code so that it won't mark allocated pages as reserved. Signed-off-by: Mike Rapoport (Microsoft) --- arch/powerpc/kernel/fadump.c | 16 ++-------------- 1 file changed, 2 insertions(+), 14 deletions(-) diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index 4ebc333dd786..501d43bf18f3 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -775,24 +775,12 @@ void __init fadump_update_elfcore_header(char *bufp) static void *__init fadump_alloc_buffer(unsigned long size) { - unsigned long count, i; - struct page *page; - void *vaddr; - - vaddr = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); - if (!vaddr) - return NULL; - - count = PAGE_ALIGN(size) / PAGE_SIZE; - page = virt_to_page(vaddr); - for (i = 0; i < count; i++) - mark_page_reserved(page + i); - return vaddr; + return alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); } static void fadump_free_buffer(unsigned long vaddr, unsigned long size) { - free_reserved_area((void *)vaddr, (void *)(vaddr + size), -1, NULL); + free_pages_exact((void *)vaddr, size); } s32 __init fadump_setup_cpu_notes_buf(u32 num_cpus) -- 2.53.0