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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-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 79206A0016 X-Stat-Signature: p1xkzsr3cxpf1is1m5f91w4ukjpkwtgc X-HE-Tag: 1774252153-709374 X-HE-Meta: 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 2gZPshO/ Pwl3AcThev9zhKc69e9Y9tBOE5xZxfHqs94sItWa7MjZWBbQhUbY7N07JWbEbsRTWDR/mop1U7biRNElhMtMPYNgCHo5zzIglgyF4cLlPM4EXxHnCMuMYrIMEH82NwWBAm0x3jisT7H0Vv7P6AtkBcoYc3AHEq3xnqZw8r/EG9IK1xMIpVUwXWiSHHxQxaduD8LKJ7WUO60fBHU8WTDeTALoNeIhlQ/U2XJ6WORDatAwX2m2VJMFC8r1XhBWNTEVR7KPpbdrykMRVInDt7WVdyhiO4TBgqAnMgCzhsK5rdBV6OiRxOyo/kUhG0EmP1JAtiV52zeSIC0TiB6nB52U9lDWNhEAb14f8d8XTu6Tlv+nroPxypH4QSQGoj2UsczKhlvt1dWpiG+VmTxP9KoWu2d/1Pw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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