On Mon, Jan 24, 2022 at 06:05:55PM +0100, Ard Biesheuvel wrote: > 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@xxxxxxxxxx> Acked-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> > --- > 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 > > -- Sincerely yours, Mike.
