050eef364a
The tlb flushing code uses the mm_users field of the mm_struct to decide if each page table entry needs to be flushed individually with IPTE or if a global flush for the mm_struct is sufficient after all page table updates have been done. The comment for mm_users says "How many users with user space?" but the /proc code increases mm_users after it found the process structure by pid without creating a new user process. Which makes mm_users useless for the decision between the two tlb flusing methods. The current code can be confused to not flush tlb entries by a concurrent access to /proc files if e.g. a fork is in progres. The solution for this problem is to make the tlb flushing logic independent from the mm_users field. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
24 lines
691 B
C
24 lines
691 B
C
#ifndef __MMU_H
|
|
#define __MMU_H
|
|
|
|
typedef struct {
|
|
atomic_t attach_count;
|
|
unsigned int flush_mm;
|
|
spinlock_t list_lock;
|
|
struct list_head crst_list;
|
|
struct list_head pgtable_list;
|
|
unsigned long asce_bits;
|
|
unsigned long asce_limit;
|
|
unsigned long vdso_base;
|
|
int noexec;
|
|
int has_pgste; /* The mmu context has extended page tables */
|
|
int alloc_pgste; /* cloned contexts will have extended page tables */
|
|
} mm_context_t;
|
|
|
|
#define INIT_MM_CONTEXT(name) \
|
|
.context.list_lock = __SPIN_LOCK_UNLOCKED(name.context.list_lock), \
|
|
.context.crst_list = LIST_HEAD_INIT(name.context.crst_list), \
|
|
.context.pgtable_list = LIST_HEAD_INIT(name.context.pgtable_list),
|
|
|
|
#endif
|