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

Morally, the presence of a gate vma is more an attribute of a particular mm than
a particular task.  Moreover, dropping the dependency on task_struct will help
make both 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 15:49:15 -04:00 committed by Al Viro
parent 375906f876
commit 31db58b3ab
10 changed files with 23 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/kernel/vdso.c
View File

@ -830,7 +830,7 @@ int in_gate_area(struct task_struct *task, unsigned long addr)
return 0;
}
struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
{
return NULL;
}

2
arch/s390/kernel/vdso.c
View File

@ -347,7 +347,7 @@ int in_gate_area(struct task_struct *task, unsigned long addr)
return 0;
}
struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
{
return NULL;
}

2
arch/sh/kernel/vsyscall/vsyscall.c
View File

@ -94,7 +94,7 @@ const char *arch_vma_name(struct vm_area_struct *vma)
return NULL;
}
struct vm_area_struct *get_gate_vma(struct task_struct *task)
struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
{
return NULL;
}

6
arch/x86/mm/init_64.c
View File

@ -861,10 +861,10 @@ static struct vm_area_struct gate_vma = {
.vm_flags = VM_READ | VM_EXEC
};
struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
{
#ifdef CONFIG_IA32_EMULATION
if (test_tsk_thread_flag(tsk, TIF_IA32))
if (!mm || mm->context.ia32_compat)
return NULL;
#endif
return &gate_vma;
@ -872,7 +872,7 @@ struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
int in_gate_area(struct task_struct *task, unsigned long addr)
{
struct vm_area_struct *vma = get_gate_vma(task);
struct vm_area_struct *vma = get_gate_vma(task->mm);
if (!vma)
return 0;

11
arch/x86/vdso/vdso32-setup.c
View File

@ -417,11 +417,12 @@ const char *arch_vma_name(struct vm_area_struct *vma)
return NULL;
}
struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
{
struct mm_struct *mm = tsk->mm;
/* Check to see if this task was created in compat vdso mode */
/*
* Check to see if the corresponding task was created in compat vdso
* mode.
*/
if (mm && mm->context.vdso == (void *)VDSO_HIGH_BASE)
return &gate_vma;
return NULL;
@ -429,7 +430,7 @@ struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
int in_gate_area(struct task_struct *task, unsigned long addr)
{
const struct vm_area_struct *vma = get_gate_vma(task);
const struct vm_area_struct *vma = get_gate_vma(task->mm);
return vma && addr >= vma->vm_start && addr < vma->vm_end;
}

2
fs/binfmt_elf.c
View File

@ -1906,7 +1906,7 @@ static int elf_core_dump(struct coredump_params *cprm)
segs = current->mm->map_count;
segs += elf_core_extra_phdrs();
gate_vma = get_gate_vma(current);
gate_vma = get_gate_vma(current->mm);
if (gate_vma != NULL)
segs++;

8
fs/proc/task_mmu.c
View File

@ -126,7 +126,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
return mm;
down_read(&mm->mmap_sem);
tail_vma = get_gate_vma(priv->task);
tail_vma = get_gate_vma(priv->task->mm);
priv->tail_vma = tail_vma;
/* Start with last addr hint */
@ -277,7 +277,8 @@ static int show_map(struct seq_file *m, void *v)
show_map_vma(m, vma);
if (m->count < m->size) /* vma is copied successfully */
m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
m->version = (vma != get_gate_vma(task->mm))
? vma->vm_start : 0;
return 0;
}
@ -436,7 +437,8 @@ static int show_smap(struct seq_file *m, void *v)
(unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0);
if (m->count < m->size) /* vma is copied successfully */
m->version = (vma != get_gate_vma(task)) ? vma->vm_start : 0;
m->version = (vma != get_gate_vma(task->mm))
? vma->vm_start : 0;
return 0;
}

2
include/linux/mm.h
View File

@ -1578,7 +1578,7 @@ static inline bool kernel_page_present(struct page *page) { return true; }
#endif /* CONFIG_HIBERNATION */
#endif
extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk);
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);

4
mm/memory.c
View File

@ -1488,7 +1488,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
vma = find_extend_vma(mm, start);
if (!vma && in_gate_area(tsk, start)) {
unsigned long pg = start & PAGE_MASK;
struct vm_area_struct *gate_vma = get_gate_vma(tsk);
struct vm_area_struct *gate_vma = get_gate_vma(tsk->mm);
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
@ -3496,7 +3496,7 @@ static int __init gate_vma_init(void)
__initcall(gate_vma_init);
#endif
struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
{
#ifdef AT_SYSINFO_EHDR
return &gate_vma;

4
mm/mlock.c
View File

@ -237,7 +237,7 @@ long mlock_vma_pages_range(struct vm_area_struct *vma,
if (!((vma->vm_flags & (VM_DONTEXPAND | VM_RESERVED)) ||
is_vm_hugetlb_page(vma) ||
vma == get_gate_vma(current))) {
vma == get_gate_vma(current->mm))) {
__mlock_vma_pages_range(vma, start, end, NULL);
@ -332,7 +332,7 @@ static int mlock_fixup(struct vm_area_struct *vma, struct vm_area_struct **prev,
int lock = newflags & VM_LOCKED;
if (newflags == vma->vm_flags || (vma->vm_flags & VM_SPECIAL) ||
is_vm_hugetlb_page(vma) || vma == get_gate_vma(current))
is_vm_hugetlb_page(vma) || vma == get_gate_vma(current->mm))
goto out; /* don't set VM_LOCKED, don't count */
pgoff = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT);