Messages in this thread Patch in this message | | | From | Ard Biesheuvel <> | Subject | [PATCH] mm: make 'highmem' symbol ro_after_init | Date | Mon, 24 Jan 2022 18:05:55 +0100 |
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The 'highmem' variable is only set at boot, so we can make it ro_after_init and prevent it from being corrupted inadvertently, or from ending up in a contended cacheline.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org> --- mm/memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memory.c b/mm/memory.c index c125c4969913..50e82cb94ccc 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -106,7 +106,7 @@ EXPORT_SYMBOL(mem_map); * highstart_pfn must be the same; there must be no gap between ZONE_NORMAL * and ZONE_HIGHMEM. */ -void *high_memory; +void *high_memory __ro_after_init; EXPORT_SYMBOL(high_memory); /* -- 2.30.2
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