[PATCH v1 3/6] powerpc/vdso: Don't rely on vdso_pages being 0 for failure

[Christophe Leroy]

If vdso initialisation failed, vdso_ready is not set.
Otherwise, vdso_pages is only 0 when it is a 32 bits task
and CONFIG_VDSO32 is not selected.

As arch_setup_additional_pages() now bails out directly in
that case, we don't need to set vdso_pages to 0.

Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
---
 arch/powerpc/kernel/vdso.c | 23 ++++++-----------------
 1 file changed, 6 insertions(+), 17 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 465150253c31..c173c70ca7d2 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -178,11 +178,6 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 
 	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;
 	/* Add a page to the vdso size for the data page */
 	vdso_pages ++;
 
@@ -712,14 +707,16 @@ static int __init vdso_init(void)
 	 * Initialize the vDSO images in memory, that is do necessary
 	 * fixups of vDSO symbols, locate trampolines, etc...
 	 */
-	if (vdso_setup())
-		goto setup_failed;
+	if (vdso_setup()) {
+		pr_err("vDSO setup failure, not enabled !\n");
+		return 0;
+	}
 
 	if (IS_ENABLED(CONFIG_VDSO32)) {
 		/* Make sure pages are in the correct state */
 		pagelist = kcalloc(vdso32_pages + 1, sizeof(struct page *), GFP_KERNEL);
 		if (!pagelist)
-			goto alloc_failed;
+			return 0;
 
 		pagelist[0] = virt_to_page(vdso_data);
 
@@ -732,7 +729,7 @@ static int __init vdso_init(void)
 	if (IS_ENABLED(CONFIG_PPC64)) {
 		pagelist = kcalloc(vdso64_pages + 1, sizeof(struct page *), GFP_KERNEL);
 		if (!pagelist)
-			goto alloc_failed;
+			return 0;
 
 		pagelist[0] = virt_to_page(vdso_data);
 
@@ -745,14 +742,6 @@ static int __init vdso_init(void)
 	smp_wmb();
 	vdso_ready = 1;
 
-	return 0;
-
-setup_failed:
-	pr_err("vDSO setup failure, not enabled !\n");
-alloc_failed:
-	vdso32_pages = 0;
-	vdso64_pages = 0;
-
 	return 0;
 }
 arch_initcall(vdso_init);
-- 
2.25.0