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Subject[PATCH v2 3/4] arm64: Implement page table free interfaces
Date
Implement pud_free_pmd_page() and pmd_free_pte_page().

Make sure, that they are indeed a page table before
taking them to free.

Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>
---
arch/arm64/mm/mmu.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 2dbb2c9..6f21a65 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -32,6 +32,7 @@
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
+#include <linux/hugetlb.h>

#include <asm/barrier.h>
#include <asm/cputype.h>
@@ -45,6 +46,7 @@
#include <asm/memblock.h>
#include <asm/mmu_context.h>
#include <asm/ptdump.h>
+#include <asm/page.h>

#define NO_BLOCK_MAPPINGS BIT(0)
#define NO_CONT_MAPPINGS BIT(1)
@@ -975,10 +977,24 @@ int pmd_clear_huge(pmd_t *pmdp)

int pud_free_pmd_page(pud_t *pud)
{
- return pud_none(*pud);
+ pmd_t *pmd;
+ int i;
+
+ pmd = __va(pud_val(*pud));
+ if (pud_val(*pud) && !pud_huge(*pud)) {
+ for (i = 0; i < PTRS_PER_PMD; i++)
+ pmd_free_pte_page(&pmd[i]);
+
+ free_page((unsigned long)pmd);
+ }
+
+ return 1;
}

int pmd_free_pte_page(pmd_t *pmd)
{
- return pmd_none(*pmd);
+ if (pmd_val(*pmd) && !pmd_huge(*pmd))
+ free_page((unsigned long)__va(pmd_val(*pmd)));
+
+ return 1;
}
--
Qualcomm India Private Limited, on behalf of Qualcomm Innovation
Center, Inc., is a member of Code Aurora Forum, a Linux Foundation
Collaborative Project
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