Messages in this thread Patch in this message | | | Subject | [PATCH 12/12] UML - Fix x86_64 page leak | Date | Thu, 01 Sep 2005 18:17:24 -0400 | From | Jeff Dike <> |
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We were leaking pmd pages when 3_LEVEL_PGTABLES was enabled. This fixes that.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Index: test/arch/um/kernel/skas/include/mmu-skas.h =================================================================== --- test.orig/arch/um/kernel/skas/include/mmu-skas.h 2005-09-01 16:54:41.000000000 -0400 +++ test/arch/um/kernel/skas/include/mmu-skas.h 2005-09-01 16:54:59.000000000 -0400 @@ -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); Index: test/arch/um/kernel/skas/mmu.c =================================================================== --- test.orig/arch/um/kernel/skas/mmu.c 2005-09-01 16:51:15.000000000 -0400 +++ test/arch/um/kernel/skas/mmu.c 2005-09-01 16:57:00.000000000 -0400 @@ -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 } } Index: test/include/asm-um/pgalloc.h =================================================================== --- test.orig/include/asm-um/pgalloc.h 2005-09-01 16:51:15.000000000 -0400 +++ test/include/asm-um/pgalloc.h 2005-09-01 16:51:36.000000000 -0400 @@ -42,11 +42,13 @@ #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte)) #ifdef CONFIG_3_LEVEL_PGTABLES -/* - * In the 3-level case we free the pmds as part of the pgd. - */ -#define pmd_free(x) do { } while (0) -#define __pmd_free_tlb(tlb,x) do { } while (0) + +extern __inline__ void pmd_free(pmd_t *pmd) +{ + free_page((unsigned long)pmd); +} + +#define __pmd_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x)) #endif #define check_pgt_cache() do { } while (0) Index: test/include/asm-um/pgtable-3level.h =================================================================== --- test.orig/include/asm-um/pgtable-3level.h 2005-09-01 16:51:15.000000000 -0400 +++ test/include/asm-um/pgtable-3level.h 2005-09-01 16:51:36.000000000 -0400 @@ -69,14 +69,11 @@ return pmd; } -static inline void pmd_free(pmd_t *pmd){ - free_page((unsigned long) pmd); +extern inline void pud_clear (pud_t *pud) +{ + set_pud(pud, __pud(0)); } -#define __pmd_free_tlb(tlb,x) do { } while (0) - -static inline void pud_clear (pud_t * pud) { } - #define pud_page(pud) \ ((struct page *) __va(pud_val(pud) & PAGE_MASK)) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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