Thread (18 messages) 18 messages, 5 authors, 2018-12-07

Re: [PATCH RFC 4/7] riscv/vdso: don't clear PG_reserved

From: Palmer Dabbelt <hidden>
Date: 2018-12-07 18:45:19
Also in: linux-mediatek, linux-mm, linux-riscv, linux-s390, linuxppc-dev, lkml

On Wed, 05 Dec 2018 04:28:48 PST (-0800), david@redhat.com wrote:
quoted hunk ↗ jump to hunk
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.

Cc: Palmer Dabbelt <redacted>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Tobias Klauser <tklauser@distanz.ch>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: David Hildenbrand <redacted>
---
 arch/riscv/kernel/vdso.c | 1 -
 1 file changed, 1 deletion(-)
diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
index 582cb153eb24..0cd044122234 100644
--- a/arch/riscv/kernel/vdso.c
+++ b/arch/riscv/kernel/vdso.c
@@ -54,7 +54,6 @@ static int __init vdso_init(void)
 		struct page *pg;

 		pg = virt_to_page(vdso_start + (i << PAGE_SHIFT));
-		ClearPageReserved(pg);
 		vdso_pagelist[i] = pg;
 	}
 	vdso_pagelist[i] = virt_to_page(vdso_data);
I'm going to assume this will go in through another tree along with the rest of 
the set assuming everyone else is happy with it.

Acked-by: Palmer Dabbelt <redacted>

Thanks!

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