linux-kernel - [PATCH 4 of 8] x86_64/setup: unconditionally populate the pgd

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Date:	Tue, 01 Jul 2008 16:46:33 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
	Stephen Tweedie <sct@...hat.com>,
	Eduardo Habkost <ehabkost@...hat.com>,
	Mark McLoughlin <markmc@...hat.com>, x86@...nel.org
Subject: [PATCH 4 of 8] x86_64/setup: unconditionally populate the pgd

When allocating a new pud, unconditionally populate the pgd (why did
we bother to create a new pud if we weren't going to populate it?).

This will only happen if the pgd slot was empty, since any existing
pud will be reused.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/mm/init_64.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -549,9 +549,8 @@
 
 		last_map_addr = phys_pud_init(pud, __pa(start), __pa(next));
 		unmap_low_page(pud);
-		if (!after_bootmem)
-			pgd_populate(&init_mm, pgd_offset_k(start),
-				     __va(pud_phys));
+		pgd_populate(&init_mm, pgd_offset_k(start),
+			     __va(pud_phys));
 	}
 
 	if (!after_bootmem)


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