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Groups > linux.kernel > #1702474
| From | Pavel Tatashin <pasha.tatashin@oracle.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [v4 12/15] mm: explicitly zero pagetable memory |
| Date | 2017-08-02 22:50 +0200 |
| Message-ID | <ua8KC-6uU-19@gated-at.bofh.it> (permalink) |
| References | <ua8AW-6r3-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Soon vmemmap_alloc_block() will no longer zero the block, so zero memory at its call sites for everything except struct pages. Struct page memory is zero'd by struct page initialization. Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com> Reviewed-by: Steven Sistare <steven.sistare@oracle.com> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com> Reviewed-by: Bob Picco <bob.picco@oracle.com> --- mm/sparse-vmemmap.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index c50b1a14d55e..d40c721ab19f 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -191,6 +191,7 @@ pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node) void *p = vmemmap_alloc_block(PAGE_SIZE, node); if (!p) return NULL; + memset(p, 0, PAGE_SIZE); pmd_populate_kernel(&init_mm, pmd, p); } return pmd; @@ -203,6 +204,7 @@ pud_t * __meminit vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node) void *p = vmemmap_alloc_block(PAGE_SIZE, node); if (!p) return NULL; + memset(p, 0, PAGE_SIZE); pud_populate(&init_mm, pud, p); } return pud; @@ -215,6 +217,7 @@ p4d_t * __meminit vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node) void *p = vmemmap_alloc_block(PAGE_SIZE, node); if (!p) return NULL; + memset(p, 0, PAGE_SIZE); p4d_populate(&init_mm, p4d, p); } return p4d; @@ -227,6 +230,7 @@ pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node) void *p = vmemmap_alloc_block(PAGE_SIZE, node); if (!p) return NULL; + memset(p, 0, PAGE_SIZE); pgd_populate(&init_mm, pgd, p); } return pgd; -- 2.13.3
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[v4 00/15] complete deferred page initialization Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:40 +0200 [v4 14/15] mm: optimize early system hash allocations Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:40 +0200 [v4 03/15] sparc64/mm: setting fields in deferred pages Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 06/15] sparc64: simplify vmemmap_populate Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 01/15] x86/mm: reserve only exiting low pages Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 02/15] x86/mm: setting fields in deferred pages Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 15/15] mm: debug for raw alloctor Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 09/15] sparc64: optimized struct page zeroing Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 12/15] mm: explicitly zero pagetable memory Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 10/15] x86/kasan: explicitly zero kasan shadow memory Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 04/15] mm: discard memblock data later Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 08/15] mm: zero struct pages during initialization Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 11/15] arm64/kasan: explicitly zero kasan shadow memory Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 07/15] mm: defining memblock_virt_alloc_try_nid_raw Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200 [v4 05/15] mm: don't accessed uninitialized struct pages Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-02 22:50 +0200
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