From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 13E032D63F8; Mon, 23 Mar 2026 07:49:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774252153; cv=none; b=Hgf3naqIXQA1j/ZXw9/bBALNB1FmUuUNAxrLbZ+AC8biG+rQvncXoM7Ny/ivQ5PeyjhwflcYfnqCjsRAUMM3abn6r4Csry9BhOePnyRAnVpr3KmNk4JPjgnUHIw/ff+dx/rxyYC1t3dD65jgdhzzNWlYR1je0N6qXK9tGVj2Qls= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774252153; c=relaxed/simple; bh=IEszaCrFLo/Rs8yG7tIln7RmG7s5ArmJTUt7L+grDBM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=S8gQxFYmG+7rxamV6HRl2biVrXxlBQtvDTRmUw2vmyAjI/ck5cKyUt0Cvq5etuUoa5Ihzt86lEKR1Aq0olMQvTg/NpkNQgiamTwzc3TH5kV8cZaIW8o3TSsqNb5kuucfPedsMV+T2c6ZkpvixqbrDwapIMjXpWqUNpaISy1Kox4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mJkHNMOm; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mJkHNMOm" 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> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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