[RFC PATCH 05/14] sparc64: Add PAGE_SHR_CTX flag
From: Mike Kravetz <hidden>
Date: 2016-12-16 18:36:15
Also in:
lkml, sparclinux
Subsystem:
sparc + ultrasparc (sparc/sparc64), the rest · Maintainers:
"David S. Miller", Andreas Larsson, Linus Torvalds
This new page flag is used to identify pages which are associated with a shared context ID. It is needed at page fault time when we only have access to the PTE and need to determine whether the associated TSB entry should be associated with the regular ot shared context TSB. A new helper routine is_sharedctx_pte() is also added. Signed-off-by: Mike Kravetz <redacted> --- arch/sparc/include/asm/pgtable_64.h | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
index 1fb317f..f2fd088 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h@@ -166,6 +166,7 @@ bool kern_addr_valid(unsigned long addr); #define _PAGE_EXEC_4V _AC(0x0000000000000080,UL) /* Executable Page */ #define _PAGE_W_4V _AC(0x0000000000000040,UL) /* Writable */ #define _PAGE_SOFT_4V _AC(0x0000000000000030,UL) /* Software bits */ +#define _PAGE_SHR_CTX_4V _AC(0x0000000000000020,UL) /* Shared Context */ #define _PAGE_PRESENT_4V _AC(0x0000000000000010,UL) /* Present */ #define _PAGE_RESV_4V _AC(0x0000000000000008,UL) /* Reserved */ #define _PAGE_SZ16GB_4V _AC(0x0000000000000007,UL) /* 16GB Page */
@@ -426,6 +427,18 @@ static inline bool is_hugetlb_pte(pte_t pte) } #endif +#if defined(CONFIG_SHARED_MMU_CTX) +static inline bool is_sharedctx_pte(pte_t pte) +{ + return !!(pte_val(pte) & _PAGE_SHR_CTX_4V); +} +#else +static inline bool is_sharedctx_pte(pte_t pte) +{ + return false; +} +#endif + static inline pte_t pte_mkdirty(pte_t pte) { unsigned long val = pte_val(pte), tmp;
--
2.7.4
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>