[PATCH v2] arm64/mm: Delete __init region from memblock.reserved
Rong Qianfeng
rongqianfeng at vivo.com
Sun Sep 1 19:39:35 PDT 2024
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,
which allows debugfs/memblock/reserved to display correct memory
information.
Signed-off-by: Rong Qianfeng <rongqianfeng at vivo.com>
---
-v2:
* Removed the conditional check for whether CONFIG_ARCH_KEEP_MEMBLOCK
is enabled, since it is always enabled on arm64.Thanks to
Ard Biesheuvel for the correction.
-v1:
https://lore.kernel.org/lkml/20240830080020.33666-1-rongqianfeng@vivo.com/
arch/arm64/mm/init.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index bfb10969cbf0..b275ead50415 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -402,6 +402,12 @@ void __init mem_init(void)
void free_initmem(void)
{
+ unsigned long aligned_begin = ALIGN_DOWN((u64)__init_begin, PAGE_SIZE);
+ unsigned long aligned_end = ALIGN((u64)__init_end, PAGE_SIZE);
+
+ /* Delete __init region from memblock.reserved. */
+ 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
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