diff options
| author |   José Pekkarinen <jose.pekkarinen@nokia.com> | 2015-10-09 08:42:44 +0300 |
|---|---|---|
| committer | José Pekkarinen <jose.pekkarinen@nokia.com> | 2015-10-09 08:52:35 +0300 |
| commit | fdb8b20906f3546ba6c2f9f0686d8a5189516ba3 (patch) | |
| tree | 6bb43dc8a42d6e9403763bc749f706939dd2bc60 /kernel/arch/mips/include/asm/pgtable.h | |
| parent | cc84a1f21026270463b580f2564f9d71912b20db (diff) | |
Kernel bump from 4.1.3-rt to 4.1.7-rt.
These changes brings a vanilla kernel from kernel.org, and the patch
applied for rt is patch-4.1.7-rt8.patch. No further changes needed.
Change-Id: Id8dd03c2ddd971e4d1d69b905f3069737053b700
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/arch/mips/include/asm/pgtable.h')
| -rw-r--r-- | kernel/arch/mips/include/asm/pgtable.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/kernel/arch/mips/include/asm/pgtable.h b/kernel/arch/mips/include/asm/pgtable.h index 819af9d05..70f6e7f07 100644 --- a/kernel/arch/mips/include/asm/pgtable.h +++ b/kernel/arch/mips/include/asm/pgtable.h @@ -182,8 +182,39 @@ static inline void set_pte(pte_t *ptep, pte_t pteval) * Make sure the buddy is global too (if it's !none, * it better already be global) */ +#ifdef CONFIG_SMP + /* + * For SMP, multiple CPUs can race, so we need to do + * this atomically. + */ +#ifdef CONFIG_64BIT +#define LL_INSN "lld" +#define SC_INSN "scd" +#else /* CONFIG_32BIT */ +#define LL_INSN "ll" +#define SC_INSN "sc" +#endif + unsigned long page_global = _PAGE_GLOBAL; + unsigned long tmp; + + __asm__ __volatile__ ( + " .set push\n" + " .set noreorder\n" + "1: " LL_INSN " %[tmp], %[buddy]\n" + " bnez %[tmp], 2f\n" + " or %[tmp], %[tmp], %[global]\n" + " " SC_INSN " %[tmp], %[buddy]\n" + " beqz %[tmp], 1b\n" + " nop\n" + "2:\n" + " .set pop" + : [buddy] "+m" (buddy->pte), + [tmp] "=&r" (tmp) + : [global] "r" (page_global)); +#else /* !CONFIG_SMP */ if (pte_none(*buddy)) pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL; +#endif /* CONFIG_SMP */ } #endif } |