linux-kernel - [PATCH v7 02/27] x86, mm: make pgd next calculation consistent with pud/pmd

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Date:	Mon, 17 Dec 2012 23:15:34 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH v7 02/27] x86, mm: make pgd next calculation consistent with pud/pmd

Just like PUD_SIZE, and PMD_SIZE next calculation, aka
round down and add size.

also remove not need next checking, just pass end instead.
later phys_pud_init uses PTRS_PER_PUD checking to exit early
if end is too big.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 arch/x86/mm/init_64.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 167439c..b1178eb 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -530,9 +530,7 @@ kernel_physical_mapping_init(unsigned long start,
 		pgd_t *pgd = pgd_offset_k(start);
 		pud_t *pud;
 
-		next = (start + PGDIR_SIZE) & PGDIR_MASK;
-		if (next > end)
-			next = end;
+		next = (start & PGDIR_MASK) + PGDIR_SIZE;
 
 		if (pgd_val(*pgd)) {
 			pud = (pud_t *)pgd_page_vaddr(*pgd);
@@ -542,7 +540,7 @@ kernel_physical_mapping_init(unsigned long start,
 		}
 
 		pud = alloc_low_page();
-		last_map_addr = phys_pud_init(pud, __pa(start), __pa(next),
+		last_map_addr = phys_pud_init(pud, __pa(start), __pa(end),
 						 page_size_mask);
 
 		spin_lock(&init_mm.page_table_lock);
-- 
1.7.10.4

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