linux-kernel - [PATCH v4 5/6] mm: Only remove nomap flag for initrd

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Date:   Mon, 13 Jun 2022 16:21:46 +0800
From:   Wupeng Ma <mawupeng1@...wei.com>
To:     <corbet@....net>, <will@...nel.org>, <ardb@...nel.org>,
        <catalin.marinas@....com>
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Subject: [PATCH v4 5/6] mm: Only remove nomap flag for initrd

From: Ma Wupeng <mawupeng1@...wei.com>

Commit 177e15f0c144 ("arm64: add the initrd region to the linear mapping explicitly")
remove all the flags of the memory used by initrd. This is fine since
MEMBLOCK_MIRROR is not used in arm64.

However with mirrored feature introduced to arm64, this will clear the mirrored
flag used by initrd, which will lead to error log printed by
find_zone_movable_pfns_for_nodes() if the lower 4G range has some non-mirrored
memory.

To solve this problem, only MEMBLOCK_NOMAP flag will be removed via
memblock_clear_nomap().

Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
---
 arch/arm64/mm/init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 339ee84e5a61..8456dbae9441 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -350,8 +350,8 @@ void __init arm64_memblock_init(void)
 			"initrd not fully accessible via the linear mapping -- please check your bootloader ...\n")) {
 			phys_initrd_size = 0;
 		} else {
-			memblock_remove(base, size); /* clear MEMBLOCK_ flags */
 			memblock_add(base, size);
+			memblock_clear_nomap(base, size);
 			memblock_reserve(base, size);
 		}
 	}
-- 
2.25.1