[RFC PATCH 07/34] mm/pgtable: define (pgd|p4d|pud)_offset_lockless() for folded page tables
Yeoreum Yun <[email protected]>
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From: "David Hildenbrand (Arm)" <[email protected]> The default helpers fallback to pud_offset(), passing a pointer to the stack value. Let's provide variants that do exactly what (pgd|p4d|pud)_offset() do, but ignore the passed pgd_t/p4d_t/pud_t, consequently not working on a pointer to the stack value like the default handlers would. Signed-off-by: David Hildenbrand (Arm) <[email protected]> Signed-off-by: Yeoreum Yun <[email protected]> --- include/asm-generic/pgtable-nop4d.h | 7 +++++++ include/asm-generic/pgtable-nopmd.h | 7 +++++++ include/asm-generic/pgtable-nopud.h | 7 +++++++ 3 files changed, 21 insertions(+) diff --git a/include/asm-generic/pgtable-nop4d.h b/include/asm-generic/pgtable-nop4d.h index c6a5a43899b50..019c3f074b771 100644 --- a/include/asm-generic/pgtable-nop4d.h +++ b/include/asm-generic/pgtable-nop4d.h @@ -39,6 +39,13 @@ static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address) return (p4d_t *)pgd; } +static inline p4d_t *p4d_offset_lockless(pgd_t *pgdp, pgd_t pgd, + unsigned long address) +{ + return (p4d_t *)pgdp; +} +#define p4d_offset_lockless p4d_offset_lockless + #define p4d_val(x) (pgd_val((x).pgd)) #define __p4d(x) ((p4d_t) { __pgd(x) }) diff --git a/include/asm-generic/pgtable-nopmd.h b/include/asm-generic/pgtable-nopmd.h index dbd38b4c3a056..ae2eff44889ac 100644 --- a/include/asm-generic/pgtable-nopmd.h +++ b/include/asm-generic/pgtable-nopmd.h @@ -50,6 +50,13 @@ static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address) } #define pmd_offset pmd_offset +static inline pmd_t *pmd_offset_lockless(pud_t *pudp, pud_t pud, + unsigned long address) +{ + return (pmd_t *)pudp; +} +#define pmd_offset_lockless pmd_offset_lockless + #define pmd_val(x) (pud_val((x).pud)) #define __pmd(x) ((pmd_t) { __pud(x) } ) diff --git a/include/asm-generic/pgtable-nopud.h b/include/asm-generic/pgtable-nopud.h index 6c9bca78047c4..5a2b0a81ae197 100644 --- a/include/asm-generic/pgtable-nopud.h +++ b/include/asm-generic/pgtable-nopud.h @@ -47,6 +47,13 @@ static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address) } #define pud_offset pud_offset +static inline pud_t *pud_offset_lockless(p4d_t *p4dp, p4d_t p4d, + unsigned long address) +{ + return (pud_t *)p4dp; +} +#define pud_offset_lockless pud_offset_lockless + #define pud_val(x) (p4d_val((x).p4d)) #define __pud(x) ((pud_t) { __p4d(x) }) -- LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}