[PATCH v3 03/23] arc: use asm-generic/mmu_context.h for no-op implementations

Nicholas Piggin
2020-09-01T14:47:18Z

Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: linux-snps-arc@lists.infradead.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---

Please ack or nack if you object to this being mered via
Arnd's tree.

arch/arc/include/asm/mmu_context.h | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/arc/include/asm/mmu_context.h b/arch/arc/include/asm/mmu_context.h
index 3a5e6a5b9ed6..df164066e172 100644
--- a/arch/arc/include/asm/mmu_context.h
+++ b/arch/arc/include/asm/mmu_context.h
@@ -102,6 +102,7 @@ static inline void get_new_mmu_context(struct mm_struct *mm)
* Initialize the context related info for a new mm_struct
* instance.
*/
+#define init_new_context init_new_context
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
@@ -113,6 +114,7 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm)
return 0;
}

+#define destroy_context destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
unsigned long flags;
@@ -153,13 +155,13 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}

/*
- * Called at the time of execve() to get a new ASID
- * Note the subtlety here: get_new_mmu_context() behaves differently here
- * vs. in switch_mm(). Here it always returns a new ASID, because mm has
- * an unallocated "initial" value, while in latter, it moves to a new ASID,
- * only if it was unallocated
+ * activate_mm defaults (in asm-generic) to switch_mm and is called at the
+ * time of execve() to get a new ASID Note the subtlety here:
+ * get_new_mmu_context() behaves differently here vs. in switch_mm(). Here
+ * it always returns a new ASID, because mm has an unallocated "initial"
+ * value, while in latter, it moves to a new ASID, only if it was
+ * unallocated
*/
-#define activate_mm(prev, next) switch_mm(prev, next, NULL)

/* it seemed that deactivate_mm( ) is a reasonable place to do book-keeping
* for retiring-mm. However destroy_context( ) still needs to do that because
@@ -168,8 +170,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
* there is a good chance that task gets sched-out/in, making it's ASID valid
* again (this teased me for a whole day).
*/
-#define deactivate_mm(tsk, mm) do { } while (0)

-#define enter_lazy_tlb(mm, tsk)
+#include <asm-generic/mmu_context.h>

#endif /* __ASM_ARC_MMU_CONTEXT_H */
--
2.23.0