diff options
| -rw-r--r-- | target/linux/generic/backport-5.15/350-v5.18-MIPS-pgalloc-fix-memory-leak-caused-by-pgd_free.patch | 48 |
1 files changed, 0 insertions, 48 deletions
diff --git a/target/linux/generic/backport-5.15/350-v5.18-MIPS-pgalloc-fix-memory-leak-caused-by-pgd_free.patch b/target/linux/generic/backport-5.15/350-v5.18-MIPS-pgalloc-fix-memory-leak-caused-by-pgd_free.patch deleted file mode 100644 index 7ab9d0764b..0000000000 --- a/target/linux/generic/backport-5.15/350-v5.18-MIPS-pgalloc-fix-memory-leak-caused-by-pgd_free.patch +++ /dev/null @@ -1,48 +0,0 @@ -From 7f297c70bebd20f3e02c9b6046e4e5e71d38ffe9 Mon Sep 17 00:00:00 2001 -From: Yaliang Wang <Yaliang.Wang@windriver.com> -Date: Thu, 10 Mar 2022 19:31:16 +0800 -Subject: [PATCH] MIPS: pgalloc: fix memory leak caused by pgd_free() - -pgd page is freed by generic implementation pgd_free() since commit -f9cb654cb550 ("asm-generic: pgalloc: provide generic pgd_free()"), -however, there are scenarios that the system uses more than one page as -the pgd table, in such cases the generic implementation pgd_free() won't -be applicable anymore. For example, when PAGE_SIZE_4KB is enabled and -MIPS_VA_BITS_48 is not enabled in a 64bit system, the macro "PGD_ORDER" -will be set as "1", which will cause allocating two pages as the pgd -table. Well, at the same time, the generic implementation pgd_free() -just free one pgd page, which will result in the memory leak. - -The memory leak can be easily detected by executing shell command: -"while true; do ls > /dev/null; grep MemFree /proc/meminfo; done" - -Fixes: f9cb654cb550 ("asm-generic: pgalloc: provide generic pgd_free()") -Signed-off-by: Yaliang Wang <Yaliang.Wang@windriver.com> -Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> -(cherry picked from commit 2bc5bab9a763d520937e4f3fe8df51c6a1eceb97) ---- - arch/mips/include/asm/pgalloc.h | 6 ++++++ - 1 file changed, 6 insertions(+) - ---- a/arch/mips/include/asm/pgalloc.h -+++ b/arch/mips/include/asm/pgalloc.h -@@ -15,6 +15,7 @@ - - #define __HAVE_ARCH_PMD_ALLOC_ONE - #define __HAVE_ARCH_PUD_ALLOC_ONE -+#define __HAVE_ARCH_PGD_FREE - #include <asm-generic/pgalloc.h> - - static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, -@@ -48,6 +49,11 @@ static inline void pud_populate(struct m - extern void pgd_init(unsigned long page); - extern pgd_t *pgd_alloc(struct mm_struct *mm); - -+static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) -+{ -+ free_pages((unsigned long)pgd, PGD_ORDER); -+} -+ - #define __pte_free_tlb(tlb,pte,address) \ - do { \ - pgtable_pte_page_dtor(pte); \ |