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riscv/vdso: don't clear PG_reserved 

The VDSO is part of the kernel image and therefore the struct pages are
marked as reserved during boot.

As we install a special mapping, the actual struct pages will never be
exposed to MM via the page tables.  We can therefore leave the pages
marked as reserved.

Link: http://lkml.kernel.org/r/20190114125903.24845-5-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Palmer Dabbelt <palmer@sifive.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Tobias Klauser <tklauser@distanz.ch>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2019-03-05 15:47:18 -08:00 committed by Linus Torvalds
parent f55b74170b
commit 795c230604
1 changed files with 0 additions and 1 deletions
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arch/riscv/kernel/vdso.c
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@ -54,7 +54,6 @@ static int __init vdso_init(void)
struct page *pg; struct page *pg;
pg = virt_to_page(vdso_start + (i << PAGE_SHIFT)); pg = virt_to_page(vdso_start + (i << PAGE_SHIFT));
ClearPageReserved(pg);
vdso_pagelist[i] = pg; vdso_pagelist[i] = pg;
} }
vdso_pagelist[i] = virt_to_page(vdso_data); vdso_pagelist[i] = virt_to_page(vdso_data);