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From: David Hildenbrand <david@redhat.com>
To: linux-mm@kvack.org
Cc: linux-s390@vger.kernel.org, Albert Ou <aou@eecs.berkeley.edu>,
	Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@redhat.com>,
	Palmer Dabbelt <palmer@sifive.com>,
	linux-kernel@vger.kernel.org,
	Matthew Wilcox <willy@infradead.org>,
	Michal Hocko <mhocko@kernel.org>,
	linux-m68k@lists.linux-m68k.org,
	linux-mediatek@lists.infradead.org,
	linux-riscv@lists.infradead.org, linuxppc-dev@lists.ozlabs.org,
	Tobias Klauser <tklauser@distanz.ch>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH RFC 4/7] riscv/vdso: don't clear PG_reserved
Date: Wed,  5 Dec 2018 13:28:48 +0100
Message-ID: <20181205122851.5891-5-david@redhat.com> (raw)
In-Reply-To: <20181205122851.5891-1-david@redhat.com>

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 <palmer@sifive.com>
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 <david@redhat.com>
---
 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);
-- 
2.17.2


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  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-05 12:28 [PATCH RFC 0/7] mm: PG_reserved cleanups and documentation David Hildenbrand
2018-12-05 12:28 ` [PATCH RFC 1/7] agp: efficeon: no need to set PG_reserved on GATT tables David Hildenbrand
2018-12-05 12:28 ` [PATCH RFC 2/7] s390/vdso: don't clear PG_reserved David Hildenbrand
2018-12-05 12:28 ` [PATCH RFC 3/7] powerpc/vdso: " David Hildenbrand
2018-12-05 12:28 ` David Hildenbrand [this message]
2018-12-07 18:45   ` [PATCH RFC 4/7] riscv/vdso: " Palmer Dabbelt
2018-12-05 12:28 ` [PATCH RFC 5/7] m68k/mm: use __ClearPageReserved() David Hildenbrand
2018-12-05 12:28 ` [PATCH RFC 6/7] arm64: kexec: no need to ClearPageReserved() David Hildenbrand
2018-12-05 14:00   ` James Morse
2018-12-05 12:28 ` [PATCH RFC 7/7] mm: better document PG_reserved David Hildenbrand
2018-12-05 12:59   ` Michal Hocko
2018-12-05 14:35   ` Matthew Wilcox
2018-12-05 15:05     ` David Hildenbrand
2018-12-05 17:32       ` Matthew Wilcox
2018-12-05 18:13         ` David Hildenbrand
2018-12-06 10:46           ` David Hildenbrand
2018-12-05 12:56 ` [PATCH RFC 0/7] mm: PG_reserved cleanups and documentation Michal Hocko
2018-12-05 13:04   ` David Hildenbrand

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