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riscv: Use WRITE_ONCE() when setting page table entries

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To avoid any compiler "weirdness" when accessing page table entries which
are concurrently modified by the HW, let's use WRITE_ONCE() macro
(commit 20a004e7b0 ("arm64: mm: Use READ_ONCE/WRITE_ONCE when accessing
page tables") gives a great explanation with more details).

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20231213203001.179237-2-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Alexandre Ghiti 2023-12-13 21:29:58 +01:00 committed by Palmer Dabbelt
parent b85ea95d08
commit c30fa83b49
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GPG Key ID: 2E1319F35FBB1889
2 changed files with 5 additions and 5 deletions
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6
arch/riscv/include/asm/pgtable-64.h
View File

@ -202,7 +202,7 @@ static inline int pud_user(pud_t pud)
static inline void set_pud(pud_t *pudp, pud_t pud)
{
*pudp = pud;
WRITE_ONCE(*pudp, pud);
}
static inline void pud_clear(pud_t *pudp)
@ -278,7 +278,7 @@ static inline unsigned long _pmd_pfn(pmd_t pmd)
static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
{
if (pgtable_l4_enabled)
*p4dp = p4d;
WRITE_ONCE(*p4dp, p4d);
else
set_pud((pud_t *)p4dp, (pud_t){ p4d_val(p4d) });
}
@ -351,7 +351,7 @@ static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
{
if (pgtable_l5_enabled)
*pgdp = pgd;
WRITE_ONCE(*pgdp, pgd);
else
set_p4d((p4d_t *)pgdp, (p4d_t){ pgd_val(pgd) });
}

4
arch/riscv/include/asm/pgtable.h
View File

@ -248,7 +248,7 @@ static inline int pmd_leaf(pmd_t pmd)
static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
{
*pmdp = pmd;
WRITE_ONCE(*pmdp, pmd);
}
static inline void pmd_clear(pmd_t *pmdp)
@ -510,7 +510,7 @@ static inline int pte_same(pte_t pte_a, pte_t pte_b)
*/
static inline void set_pte(pte_t *ptep, pte_t pteval)
{
*ptep = pteval;
WRITE_ONCE(*ptep, pteval);
}
void flush_icache_pte(pte_t pte);