summaryrefslogtreecommitdiff
path: root/include/asm-generic/mmu_context.h
diff options
context:
space:
mode:
authorNicholas Piggin <npiggin@gmail.com>2020-09-01 17:15:17 +0300
committerArnd Bergmann <arnd@arndb.de>2020-10-26 18:45:03 +0300
commit94f89922e1e094f57a143965059a3e477f3f2fdc (patch)
treecbaa4958435ba56d87a73985d2d68a2965e19dfd /include/asm-generic/mmu_context.h
parent3650b228f83adda7e5ee532e2b90429c03f7b9ec (diff)
downloadlinux-94f89922e1e094f57a143965059a3e477f3f2fdc.tar.xz
asm-generic: add generic MMU versions of mmu context functions
Many of these are no-ops on many architectures, so extend mmu_context.h to cover MMU and NOMMU, and split the NOMMU bits out to nommu_context.h Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Acked-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: linux-arch@vger.kernel.org Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'include/asm-generic/mmu_context.h')
-rw-r--r--include/asm-generic/mmu_context.h58
1 files changed, 44 insertions, 14 deletions
diff --git a/include/asm-generic/mmu_context.h b/include/asm-generic/mmu_context.h
index 6be9106fb6fb..91727065bacb 100644
--- a/include/asm-generic/mmu_context.h
+++ b/include/asm-generic/mmu_context.h
@@ -3,44 +3,74 @@
#define __ASM_GENERIC_MMU_CONTEXT_H
/*
- * Generic hooks for NOMMU architectures, which do not need to do
- * anything special here.
+ * Generic hooks to implement no-op functionality.
*/
-#include <asm-generic/mm_hooks.h>
-
struct task_struct;
struct mm_struct;
+/*
+ * enter_lazy_tlb - Called when "tsk" is about to enter lazy TLB mode.
+ *
+ * @mm: the currently active mm context which is becoming lazy
+ * @tsk: task which is entering lazy tlb
+ *
+ * tsk->mm will be NULL
+ */
+#ifndef enter_lazy_tlb
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
}
+#endif
+/**
+ * init_new_context - Initialize context of a new mm_struct.
+ * @tsk: task struct for the mm
+ * @mm: the new mm struct
+ * @return: 0 on success, -errno on failure
+ */
+#ifndef init_new_context
static inline int init_new_context(struct task_struct *tsk,
struct mm_struct *mm)
{
return 0;
}
+#endif
+/**
+ * destroy_context - Undo init_new_context when the mm is going away
+ * @mm: old mm struct
+ */
+#ifndef destroy_context
static inline void destroy_context(struct mm_struct *mm)
{
}
+#endif
-static inline void deactivate_mm(struct task_struct *task,
- struct mm_struct *mm)
-{
-}
-
-static inline void switch_mm(struct mm_struct *prev,
- struct mm_struct *next,
- struct task_struct *tsk)
+/**
+ * activate_mm - called after exec switches the current task to a new mm, to switch to it
+ * @prev_mm: previous mm of this task
+ * @next_mm: new mm
+ */
+#ifndef activate_mm
+static inline void activate_mm(struct mm_struct *prev_mm,
+ struct mm_struct *next_mm)
{
+ switch_mm(prev_mm, next_mm, current);
}
+#endif
-static inline void activate_mm(struct mm_struct *prev_mm,
- struct mm_struct *next_mm)
+/**
+ * dectivate_mm - called when an mm is released after exit or exec switches away from it
+ * @tsk: the task
+ * @mm: the old mm
+ */
+#ifndef deactivate_mm
+static inline void deactivate_mm(struct task_struct *tsk,
+ struct mm_struct *mm)
{
}
+#endif
#endif /* __ASM_GENERIC_MMU_CONTEXT_H */