Messages in this thread Patch in this message | | | From | js1304@gmail ... | Subject | [PATCH] mm/kasan: use kasan_zero_pud for p4d table | Date | Mon, 15 May 2017 15:20:55 +0900 |
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From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
There is missing optimization in zero_p4d_populate() that can save some memory when mapping zero shadow. Implement it like as others.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> --- mm/kasan/kasan_init.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/mm/kasan/kasan_init.c b/mm/kasan/kasan_init.c index b96a5f7..554e4c0 100644 --- a/mm/kasan/kasan_init.c +++ b/mm/kasan/kasan_init.c @@ -118,6 +118,18 @@ static void __init zero_p4d_populate(pgd_t *pgd, unsigned long addr, do { next = p4d_addr_end(addr, end); + if (IS_ALIGNED(addr, P4D_SIZE) && end - addr >= P4D_SIZE) { + pud_t *pud; + pmd_t *pmd; + + p4d_populate(&init_mm, p4d, lm_alias(kasan_zero_pud)); + pud = pud_offset(p4d, addr); + pud_populate(&init_mm, pud, lm_alias(kasan_zero_pmd)); + pmd = pmd_offset(pud, addr); + pmd_populate_kernel(&init_mm, pmd, + lm_alias(kasan_zero_pte)); + continue; + } if (p4d_none(*p4d)) { p4d_populate(&init_mm, p4d, -- 2.7.4
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