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authorStephen Wilson <wilsons@start.ca>2011-03-13 22:49:15 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-23 23:36:54 +0300
commit31db58b3ab432f72ea76be58b12e6ffaf627d5db (patch)
treec88b742e1f2c52045d5abc6d35d7492ebdf64541 /arch/x86/vdso
parent375906f8765e131a4a159b1ffebf78c15db7b3bf (diff)
downloadlinux-31db58b3ab432f72ea76be58b12e6ffaf627d5db.tar.xz
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>
Diffstat (limited to 'arch/x86/vdso')
-rw-r--r--arch/x86/vdso/vdso32-setup.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/x86/vdso/vdso32-setup.c b/arch/x86/vdso/vdso32-setup.c
index 36df991985b2..1f651f6bdf61 100644
--- a/arch/x86/vdso/vdso32-setup.c
+++ b/arch/x86/vdso/vdso32-setup.c
@@ -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;
}