[PATCH] uml: fix x86_64 page leak
We were leaking pmd pages when 3_LEVEL_PGTABLES was enabled. This fixes that.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/um/kernel/skas/include/mmu-skas.h b/arch/um/kernel/skas/include/mmu-skas.h
index 278b72f..09536f8 100644
--- a/arch/um/kernel/skas/include/mmu-skas.h
+++ b/arch/um/kernel/skas/include/mmu-skas.h
@@ -6,11 +6,15 @@
#ifndef __SKAS_MMU_H
#define __SKAS_MMU_H
+#include "linux/config.h"
#include "mm_id.h"
struct mmu_context_skas {
struct mm_id id;
unsigned long last_page_table;
+#ifdef CONFIG_3_LEVEL_PGTABLES
+ unsigned long last_pmd;
+#endif
};
extern void switch_mm_skas(struct mm_id * mm_idp);
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
index d837223..240143b 100644
--- a/arch/um/kernel/skas/mmu.c
+++ b/arch/um/kernel/skas/mmu.c
@@ -56,6 +56,9 @@
*/
mm->context.skas.last_page_table = pmd_page_kernel(*pmd);
+#ifdef CONFIG_3_LEVEL_PGTABLES
+ mm->context.skas.last_pmd = (unsigned long) __va(pud_val(*pud));
+#endif
*pte = mk_pte(virt_to_page(kernel), __pgprot(_PAGE_PRESENT));
*pte = pte_mkexec(*pte);
@@ -144,6 +147,10 @@
if(!proc_mm || !ptrace_faultinfo){
free_page(mmu->id.stack);
- free_page(mmu->last_page_table);
+ pte_free_kernel((pte_t *) mmu->last_page_table);
+ dec_page_state(nr_page_table_pages);
+#ifdef CONFIG_3_LEVEL_PGTABLES
+ pmd_free((pmd_t *) mmu->last_pmd);
+#endif
}
}