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>
diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c index fd87287..6169f17 100644 --- a/arch/powerpc/kernel/vdso.c +++ b/arch/powerpc/kernel/vdso.c
@@ -830,7 +830,7 @@ 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; }
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c index f438d74..d19f305 100644 --- a/arch/s390/kernel/vdso.c +++ b/arch/s390/kernel/vdso.c
@@ -347,7 +347,7 @@ 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; }
diff --git a/arch/sh/kernel/vsyscall/vsyscall.c b/arch/sh/kernel/vsyscall/vsyscall.c index 242117c..3f9b6f4 100644 --- a/arch/sh/kernel/vsyscall/vsyscall.c +++ b/arch/sh/kernel/vsyscall/vsyscall.c
@@ -94,7 +94,7 @@ 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; }
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 0aa3466..dd4809b 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c
@@ -861,10 +861,10 @@ .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 @@ 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;
diff --git a/arch/x86/vdso/vdso32-setup.c b/arch/x86/vdso/vdso32-setup.c index 36df991..1f651f6 100644 --- a/arch/x86/vdso/vdso32-setup.c +++ b/arch/x86/vdso/vdso32-setup.c
@@ -417,11 +417,12 @@ 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 @@ 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; }
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index d5b640b..bbabdcc 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c
@@ -1906,7 +1906,7 @@ 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++;
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 8fed0f8..e73314a 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c
@@ -126,7 +126,7 @@ 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 @@ 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 @@ (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; }
diff --git a/include/linux/mm.h b/include/linux/mm.h index 581703d..18b4a63 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h
@@ -1578,7 +1578,7 @@ #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);
diff --git a/mm/memory.c b/mm/memory.c index e48945a..b6dc370 100644 --- a/mm/memory.c +++ b/mm/memory.c
@@ -1488,7 +1488,7 @@ 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 @@ __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;
diff --git a/mm/mlock.c b/mm/mlock.c index c3924c7f..2689a08c 100644 --- a/mm/mlock.c +++ b/mm/mlock.c
@@ -237,7 +237,7 @@ 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 @@ 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);