[PATCH] powerpc vdso updates

@@ -757,10 +757,10 @@ static int handle_rt_signal(unsigned lon
 
 	/* Save user registers on the stack */
 	frame = &rt_sf->uc.uc_mcontext;
-	if (vdso32_rt_sigtramp && current->thread.vdso_base) {
+	if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
 		if (save_user_regs(regs, frame, 0))
 			goto badframe;
-		regs->link = current->thread.vdso_base + vdso32_rt_sigtramp;
+		regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp;
 	} else {
 		if (save_user_regs(regs, frame, __NR_rt_sigreturn))
 			goto badframe;

@@ -1029,10 +1029,10 @@ static int handle_signal(unsigned long s
 	    || __put_user(sig, &sc->signal))
 		goto badframe;
 
-	if (vdso32_sigtramp && current->thread.vdso_base) {
+	if (vdso32_sigtramp && current->mm->context.vdso_base) {
 		if (save_user_regs(regs, &frame->mctx, 0))
 			goto badframe;
-		regs->link = current->thread.vdso_base + vdso32_sigtramp;
+		regs->link = current->mm->context.vdso_base + vdso32_sigtramp;
 	} else {
 		if (save_user_regs(regs, &frame->mctx, __NR_sigreturn))
 			goto badframe;

@@ -394,8 +394,8 @@ static int setup_rt_frame(int signr, str
 	current->thread.fpscr.val = 0;
 
 	/* Set up to return from userspace. */
-	if (vdso64_rt_sigtramp && current->thread.vdso_base) {
-		regs->link = current->thread.vdso_base + vdso64_rt_sigtramp;
+	if (vdso64_rt_sigtramp && current->mm->context.vdso_base) {
+		regs->link = current->mm->context.vdso_base + vdso64_rt_sigtramp;
 	} else {
 		err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
 		if (err)

@@ -223,6 +223,7 @@ int arch_setup_additional_pages(struct l
 	struct vm_area_struct *vma;
 	unsigned long vdso_pages;
 	unsigned long vdso_base;
+	int rc;
 
 #ifdef CONFIG_PPC64
 	if (test_thread_flag(TIF_32BIT)) {

@@ -237,20 +238,13 @@ int arch_setup_additional_pages(struct l
 	vdso_base = VDSO32_MBASE;
 #endif
 
-	current->thread.vdso_base = 0;
+	current->mm->context.vdso_base = 0;
 
 	/* vDSO has a problem and was disabled, just don't "enable" it for the
 	 * process
 	 */
 	if (vdso_pages == 0)
 		return 0;
-
-	vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
-	if (vma == NULL)
-		return -ENOMEM;
-
-	memset(vma, 0, sizeof(*vma));
-
 	/* Add a page to the vdso size for the data page */
 	vdso_pages ++;
 

@@ -259,17 +253,23 @@ int arch_setup_additional_pages(struct l
 	 * at vdso_base which is the "natural" base for it, but we might fail
 	 * and end up putting it elsewhere.
 	 */
+	down_write(&mm->mmap_sem);
 	vdso_base = get_unmapped_area(NULL, vdso_base,
 				      vdso_pages << PAGE_SHIFT, 0, 0);
-	if (vdso_base & ~PAGE_MASK) {
-		kmem_cache_free(vm_area_cachep, vma);
-		return (int)vdso_base;
+	if (IS_ERR_VALUE(vdso_base)) {
+		rc = vdso_base;
+		goto fail_mmapsem;
 	}
 
-	current->thread.vdso_base = vdso_base;
 
+	/* Allocate a VMA structure and fill it up */
+	vma = kmem_cache_zalloc(vm_area_cachep, SLAB_KERNEL);
+	if (vma == NULL) {
+		rc = -ENOMEM;
+		goto fail_mmapsem;
+	}
 	vma->vm_mm = mm;
-	vma->vm_start = current->thread.vdso_base;
+	vma->vm_start = vdso_base;
 	vma->vm_end = vma->vm_start + (vdso_pages << PAGE_SHIFT);
 
 	/*

@@ -282,23 +282,38 @@ int arch_setup_additional_pages(struct l
 	 * It's fine to use that for setting breakpoints in the vDSO code
 	 * pages though
 	 */
-	vma->vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
+	vma->vm_flags = VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC;
 	vma->vm_flags |= mm->def_flags;
 	vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
 	vma->vm_ops = &vdso_vmops;
 
-	down_write(&mm->mmap_sem);
-	if (insert_vm_struct(mm, vma)) {
-		up_write(&mm->mmap_sem);
-		kmem_cache_free(vm_area_cachep, vma);
-		return -ENOMEM;
-	}
+	/* Insert new VMA */
+	rc = insert_vm_struct(mm, vma);
+	if (rc)
+		goto fail_vma;
+
+	/* Put vDSO base into mm struct and account for memory usage */
+	current->mm->context.vdso_base = vdso_base;
 	mm->total_vm += (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 	up_write(&mm->mmap_sem);
-
 	return 0;
+
+ fail_vma:
+	kmem_cache_free(vm_area_cachep, vma);
+ fail_mmapsem:
+	up_write(&mm->mmap_sem);
+	return rc;
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+	if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
+		return "[vdso]";
+	return NULL;
 }
 
+
+
 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
 				  unsigned long *size)
 {

@@ -294,7 +294,7 @@ do {									\
 	NEW_AUX_ENT(AT_DCACHEBSIZE, dcache_bsize);			\
 	NEW_AUX_ENT(AT_ICACHEBSIZE, icache_bsize);			\
 	NEW_AUX_ENT(AT_UCACHEBSIZE, ucache_bsize);			\
-	VDSO_AUX_ENT(AT_SYSINFO_EHDR, current->thread.vdso_base)	\
+	VDSO_AUX_ENT(AT_SYSINFO_EHDR, current->mm->context.vdso_base)	\
 } while (0)
 
 /* PowerPC64 relocations defined by the ABIs */

@@ -360,6 +360,7 @@ typedef struct {
 #ifdef CONFIG_HUGETLB_PAGE
 	u16 low_htlb_areas, high_htlb_areas;
 #endif
+	unsigned long vdso_base;
 } mm_context_t;
 
 

@@ -198,6 +198,9 @@ extern void copy_user_page(void *to, voi
 		struct page *p);
 extern int page_is_ram(unsigned long pfn);
 
+struct vm_area_struct;
+extern const char *arch_vma_name(struct vm_area_struct *vma);
+
 #include <asm-generic/memory_model.h>
 #endif /* __ASSEMBLY__ */
 

@@ -153,7 +153,6 @@ struct thread_struct {
 	unsigned long	start_tb;	/* Start purr when proc switched in */
 	unsigned long	accum_tb;	/* Total accumilated purr for process */
 #endif
-	unsigned long	vdso_base;	/* base of the vDSO library */
 	unsigned long	dabr;		/* Data address breakpoint register */
 #ifdef CONFIG_ALTIVEC
 	/* Complete AltiVec register set */