linux-kernel - [PATCH v3 10/20] ARM: LPAE: Change setup_mm_for

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Date:	Mon, 15 Nov 2010 17:40:19 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 10/20] ARM: LPAE: Change setup_mm_for_reboot() to work with LPAE

This function was assuming that there are only two levels of page
tables. The patch changes looping over the PMD entries to make it
compatible with LPAE.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
---
 arch/arm/mm/mmu.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 0ce781f..e238340 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1098,13 +1098,16 @@ void setup_mm_for_reboot(char mode)
 	if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale())
 		base_pmdval |= PMD_BIT4;
 
-	for (i = 0; i < FIRST_USER_PGD_NR + USER_PTRS_PER_PGD; i++, pgd++) {
+	for (i = 0; i < TASK_SIZE >> PMD_SHIFT; i++) {
 		unsigned long pmdval = (i << PMD_SHIFT) | base_pmdval;
 		pmd_t *pmd;
+		unsigned long addr = i << PMD_SHIFT;
 
-		pmd = pmd_off(pgd, i << PMD_SHIFT);
+		pmd = pmd_off(pgd + pgd_index(addr), addr);
 		pmd[0] = __pmd(pmdval);
+#ifndef CONFIG_ARM_LPAE
 		pmd[1] = __pmd(pmdval + (1 << (PMD_SHIFT - 1)));
+#endif
 		flush_pmd_entry(pmd);
 	}
 
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