mm: arch: make in_gate_area take an mm_struct instead of a task_struct

Morally, the question of whether an address lies in a gate vma should be asked
with respect to an mm, not a particular task.  Moreover, dropping the dependency
on task_struct will help make existing and future operations on mm's more
flexible and convenient.

Signed-off-by: Stephen Wilson <wilsons@start.ca>
Reviewed-by: Michel Lespinasse <walken@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Stephen Wilson 2011-03-13 15:49:16 -04:00 committed by Al Viro
parent 31db58b3ab
commit 83b964bbf8
7 changed files with 10 additions and 10 deletions

View file

@ -825,7 +825,7 @@ int in_gate_area_no_task(unsigned long addr)
return 0;
}
int in_gate_area(struct task_struct *task, unsigned long addr)
int in_gate_area(struct mm_struct *mm, unsigned long addr)
{
return 0;
}

View file

@ -342,7 +342,7 @@ int in_gate_area_no_task(unsigned long addr)
return 0;
}
int in_gate_area(struct task_struct *task, unsigned long addr)
int in_gate_area(struct mm_struct *mm, unsigned long addr)
{
return 0;
}

View file

@ -99,7 +99,7 @@ struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
return NULL;
}
int in_gate_area(struct task_struct *task, unsigned long address)
int in_gate_area(struct mm_struct *mm, unsigned long address)
{
return 0;
}

View file

@ -870,9 +870,9 @@ struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
return &gate_vma;
}
int in_gate_area(struct task_struct *task, unsigned long addr)
int in_gate_area(struct mm_struct *mm, unsigned long addr)
{
struct vm_area_struct *vma = get_gate_vma(task->mm);
struct vm_area_struct *vma = get_gate_vma(mm);
if (!vma)
return 0;

View file

@ -428,9 +428,9 @@ struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
return NULL;
}
int in_gate_area(struct task_struct *task, unsigned long addr)
int in_gate_area(struct mm_struct *mm, unsigned long addr)
{
const struct vm_area_struct *vma = get_gate_vma(task->mm);
const struct vm_area_struct *vma = get_gate_vma(mm);
return vma && addr >= vma->vm_start && addr < vma->vm_end;
}

View file

@ -1581,10 +1581,10 @@ static inline bool kernel_page_present(struct page *page) { return true; }
extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm);
#ifdef __HAVE_ARCH_GATE_AREA
int in_gate_area_no_task(unsigned long addr);
int in_gate_area(struct task_struct *task, unsigned long addr);
int in_gate_area(struct mm_struct *mm, unsigned long addr);
#else
int in_gate_area_no_task(unsigned long addr);
#define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
#define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_task(addr);})
#endif /* __HAVE_ARCH_GATE_AREA */
int drop_caches_sysctl_handler(struct ctl_table *, int,

View file

@ -1486,7 +1486,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
struct vm_area_struct *vma;
vma = find_extend_vma(mm, start);
if (!vma && in_gate_area(tsk, start)) {
if (!vma && in_gate_area(tsk->mm, start)) {
unsigned long pg = start & PAGE_MASK;
struct vm_area_struct *gate_vma = get_gate_vma(tsk->mm);
pgd_t *pgd;