linux-kernel - [PATCH] arm64/mm: Delete __init region from memblock.reserved

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Message-Id: <20240830080020.33666-1-rongqianfeng@vivo.com>
Date: Fri, 30 Aug 2024 16:00:16 +0800
From: Rong Qianfeng <rongqianfeng@...o.com>
To: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Baoquan He <bhe@...hat.com>,
	Petr Tesarik <ptesarik@...e.com>,
	Baruch Siach <baruch@...s.co.il>,
	"Mike Rapoport (IBM)" <rppt@...nel.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	Rong Qianfeng <rongqianfeng@...o.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com
Subject: [PATCH] arm64/mm: Delete __init region from memblock.reserved

If CONFIG_ARCH_KEEP_MEMBLOCK is enabled, the memory information in
memblock will be retained. We release the __init memory here, and
we should also delete the corresponding region in memblock.reserved.

Signed-off-by: Rong Qianfeng <rongqianfeng@...o.com>
---
 arch/arm64/mm/init.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index bfb10969cbf0..99cfa217e905 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -402,6 +402,13 @@ void __init mem_init(void)
 
 void free_initmem(void)
 {
+	if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) {
+		unsigned long aligned_begin = ALIGN_DOWN((u64)__init_begin, PAGE_SIZE);
+		unsigned long aligned_end = ALIGN((u64)__init_end, PAGE_SIZE);
+
+		memblock_free((void *)aligned_begin, aligned_end - aligned_begin);
+	}
+
 	free_reserved_area(lm_alias(__init_begin),
 			   lm_alias(__init_end),
 			   POISON_FREE_INITMEM, "unused kernel");
-- 
2.39.0