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arc: use asm-generic/mmu_context.h for no-op implementations 

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: linux-snps-arc@lists.infradead.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Nicholas Piggin 2020-09-02 00:15:19 +10:00 committed by Arnd Bergmann
parent 6dfc3f5bcb
commit 75e6a851d6
1 changed files with 9 additions and 8 deletions
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17
arch/arc/include/asm/mmu_context.h
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@ -102,6 +102,7 @@ set_hw:
* 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 */