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 5DD763BAD8C; Wed, 18 Mar 2026 10:59:37 +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=1773831577; cv=none; b=bdEwxsdAEnTNKgE4NpJaQUrFditpmK9EenrEpV2CT07dLH0NuOQ2LuEJ/LPXEQHD/91IpUHLxhMcPXRvE3awvDbBXPIqKphbnI07P8aLQcYpKwpN+fe7S0WZvf6C4FW+xUK3fbI+i1X4izGCd6DMr/emlE0eVy0mcXqsCKItTww= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773831577; c=relaxed/simple; bh=3jRGnlRsbxlziNoo+921sbArWCqbGJ6zS/W7kucFKbQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kxlBQNKtNYPyLkxYg3R/ZVroHjW+Gk906JtmCKeeUtQOZzmgY+NfFSfqHnnMDoEX/ZkFfDdz1wY22/jahjwy28sCw+ldAKxsmri+x57VEAVQ+E7XDptIcFZ3/E2AiMMPSOT0IQDr1Oz5JrRd5Orbl3/LO3Szv2r57U+VS4hPG7M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AYu8UWE0; 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="AYu8UWE0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2464EC2BCB3; Wed, 18 Mar 2026 10:59:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773831576; bh=3jRGnlRsbxlziNoo+921sbArWCqbGJ6zS/W7kucFKbQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AYu8UWE0uFP7kB52RIh6t5RHb8Lm82CthAw5o2Oz3/zBoVceCs4mevcwy6gXgoXy3 zXfPELcxFDWWiacgMliiuggXx4CV15PRxM42zTRXwcC3AeoBO09S3lAQHEwKxmkc7u S7zXJ3CpTFE4MwPOLMtCKjhcoKMWuzWjdNv96Yp+/yqtszyHDPqhX4x4WIqEjLXCRy S3fvXz5m7LXo+SKILBEx1LpyBkMBSiLRc03d6ukL/MmLsvH4qH3q9/64XLA1d9HPwg 5R9bM+nCssf+m8rw1md06HV3Yf1v3AkdohGI5IDu5nkObk79u9DBk47nkf1xIJ97j2 QS9n6tdkUUzmA== 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 5/8] memblock: extract page freeing from free_reserved_area() into a helper Date: Wed, 18 Mar 2026 12:58:24 +0200 Message-ID: <20260318105827.1358927-6-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)" There are two functions that release pages to the buddy allocator late in the boot: free_reserved_area() and memblock_free_late(). Currently they are using different underlying functionality, free_reserved_area() runs each page being freed via free_reserved_page() and memblock_free_late() uses memblock_free_pages() -> __free_pages_core(), but in the end they both boil down to a loop that frees a range page by page. Extract the loop frees pages from free_reserved_area() into a helper and use that helper in memblock_free_late(). Signed-off-by: Mike Rapoport (Microsoft) --- mm/memblock.c | 55 +++++++++++++++++++++++++++------------------------ 1 file changed, 29 insertions(+), 26 deletions(-) diff --git a/mm/memblock.c b/mm/memblock.c index 27d4c9889b59..87bd200a8cc9 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -893,26 +893,12 @@ int __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size) return memblock_remove_range(&memblock.memory, base, size); } -unsigned long free_reserved_area(void *start, void *end, int poison, const char *s) +static unsigned long __free_reserved_area(phys_addr_t start, phys_addr_t end, + int poison) { - phys_addr_t start_pa, end_pa; unsigned long pages = 0, pfn; - /* - * end is the first address past the region and it may be beyond what - * __pa() or __pa_symbol() can handle. - * Use the address included in the range for the cnversion and add back - * 1 afterwards. - */ - if (__is_kernel((unsigned long)start)) { - start_pa = __pa_symbol(start); - end_pa = __pa_symbol(end - 1) + 1; - } else { - start_pa = __pa(start); - end_pa = __pa(end - 1) + 1; - } - - for_each_valid_pfn(pfn, PFN_UP(start_pa), PFN_DOWN(end_pa)) { + for_each_valid_pfn(pfn, PFN_UP(start), PFN_DOWN(end)) { struct page *page = pfn_to_page(pfn); void *direct_map_addr; @@ -934,7 +920,29 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char free_reserved_page(page); pages++; } + return pages; +} + +unsigned long free_reserved_area(void *start, void *end, int poison, const char *s) +{ + phys_addr_t start_pa, end_pa; + unsigned long pages; + + /* + * end is the first address past the region and it may be beyond what + * __pa() or __pa_symbol() can handle. + * Use the address included in the range for the cnversion and add back + * 1 afterwards. + */ + if (__is_kernel((unsigned long)start)) { + start_pa = __pa_symbol(start); + end_pa = __pa_symbol(end - 1) + 1; + } else { + start_pa = __pa(start); + end_pa = __pa(end - 1) + 1; + } + pages = __free_reserved_area(start_pa, end_pa, poison); if (pages && s) pr_info("Freeing %s memory: %ldK\n", s, K(pages)); @@ -1810,20 +1818,15 @@ void *__init __memblock_alloc_or_panic(phys_addr_t size, phys_addr_t align, */ void __init memblock_free_late(phys_addr_t base, phys_addr_t size) { - phys_addr_t cursor, end; + phys_addr_t end = base + size - 1; - end = base + size - 1; memblock_dbg("%s: [%pa-%pa] %pS\n", __func__, &base, &end, (void *)_RET_IP_); - kmemleak_free_part_phys(base, size); - cursor = PFN_UP(base); - end = PFN_DOWN(base + size); - for (; cursor < end; cursor++) { - memblock_free_pages(cursor, 0); - totalram_pages_inc(); - } + kmemleak_free_part_phys(base, size); + __free_reserved_area(base, base + size, -1); } + /* * Remaining API functions */ -- 2.51.0