[PATCH RFC v2 18/27] arm64: mte: Reserve tag block for the zero page
From: Alexandru Elisei <hidden>
Date: 2023-11-19 16:59:14
Also in:
kvmarm, linux-arch, linux-fsdevel, linux-mm, linux-trace-kernel, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
On arm64, the zero page receives special treatment by having the tagged flag set on MTE initialization, not when the page is mapped in a process address space. Reserve the corresponding tag block when tag storage management is being activated. Signed-off-by: Alexandru Elisei <redacted> --- arch/arm64/kernel/mte_tag_storage.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arm64/kernel/mte_tag_storage.c b/arch/arm64/kernel/mte_tag_storage.c
index 833480048170..a1cc239f7211 100644
--- a/arch/arm64/kernel/mte_tag_storage.c
+++ b/arch/arm64/kernel/mte_tag_storage.c@@ -393,6 +393,8 @@ static int __init mte_tag_storage_activate_regions(void) totalcma_pages += range_len(tag_range); } + reserve_tag_storage(ZERO_PAGE(0), 0, GFP_HIGHUSER_MOVABLE); + return 0; out_disabled:
--
2.42.1
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