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 2B0433A7F62; Wed, 18 Mar 2026 10:58:53 +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=1773831533; cv=none; b=eR2PGBhAQ2EiF3NReKQRu9EonRrjRSQTD1H6Vc2TRfvueKsS6bDrxyAh8KBKDFrJQEInGbZX2qNWn1dikzyeCY6oArx7avk8FlyJtClcIcR5Cr+XpLEpcsCcPyC56qLjfU5G9t20ewD2ptTIGqdvBqFotjz2t9q3hBNHfHq51pQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773831533; c=relaxed/simple; bh=Xt2trVGOu+O7P4h2C+N66P7rMFK2F5qGGY0Nx9maAnI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Y2D0d/7ao4ZDE6A6clE64Lbn1k34ADsqmB2ON9UckNmLdW/SmlN0mU2MwZnDTJswrW/WjpN33gRHTa3SrU2/lLkf7NAgBPxV0PTNSSsYozXzl5mohRijWEPm6SrxIcBKsqd7SyRTBndArWVKBocT+APVCcBdMmGZBgyFh0XxLGg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pcCtAXo9; 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="pcCtAXo9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C28CC19424; Wed, 18 Mar 2026 10:58:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773831532; bh=Xt2trVGOu+O7P4h2C+N66P7rMFK2F5qGGY0Nx9maAnI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pcCtAXo9HFjeLmxxQDz1bWFGhGz3cgAlZqqVZqUib3biO4lA09lDRUAnvR7VPd8xK xud5VSvoOVpP/uusVxy/mEj9ZPuFa9FBiEZXenJRIhcJDaFVEfdONJUF/a5DeLxg/6 9eJWF8V9iJtWLHumgV17GT6fy0gRDiS3mfXFa5ikPxnCcIM5ggnEsU6yokHlyO3U1v z1M3PIiEZAT6J/8aMQ7R2ZMjIU13s+SJp+4B5zRJ5Z2M0LcqXMaYHaFCkfTXOiu6r5 wdkBq5ZN/Uu4ADC4SCCEps0JuPHvaJpv8CueQ5TFX51Ua5WHxeubzTq7aqhN6Hf77n s2wD6ho9PQsRQ== 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 1/8] powerpc: fadump: pair alloc_pages_exact() with free_pages_exact() Date: Wed, 18 Mar 2026 12:58:20 +0200 Message-ID: <20260318105827.1358927-2-rppt@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260318105827.1358927-1-rppt@kernel.org> References: <20260318105827.1358927-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@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) -- 2.51.0