linux-kernel - [PATCH 1/7] powerpc/vdso: unify return paths in setup_additional

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Message-ID: <20161025155106.29946-2-dsafonov@virtuozzo.com>
Date:   Tue, 25 Oct 2016 18:51:00 +0300
From:   Dmitry Safonov <dsafonov@...tuozzo.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <0x7f454c46@...il.com>, Dmitry Safonov <dsafonov@...tuozzo.com>,
        "Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andy Lutomirski <luto@...capital.net>,
        Oleg Nesterov <oleg@...hat.com>,
        <linuxppc-dev@...ts.ozlabs.org>, <linux-mm@...ck.org>
Subject: [PATCH 1/7] powerpc/vdso: unify return paths in setup_additional_pages

Impact: cleanup

Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-mm@...ck.org 
Signed-off-by: Dmitry Safonov <dsafonov@...tuozzo.com>
---
 arch/powerpc/kernel/vdso.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 4111d30badfa..4ffb82a2d9e9 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -154,7 +154,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 	struct page **vdso_pagelist;
 	unsigned long vdso_pages;
 	unsigned long vdso_base;
-	int rc;
+	int ret = 0;
 
 	if (!vdso_ready)
 		return 0;
@@ -203,8 +203,8 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 				      ((VDSO_ALIGNMENT - 1) & PAGE_MASK),
 				      0, 0);
 	if (IS_ERR_VALUE(vdso_base)) {
-		rc = vdso_base;
-		goto fail_mmapsem;
+		ret = vdso_base;
+		goto out_up_mmap_sem;
 	}
 
 	/* Add required alignment. */
@@ -227,21 +227,16 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 	 * It's fine to use that for setting breakpoints in the vDSO code
 	 * pages though.
 	 */
-	rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
+	ret = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
 				     VM_READ|VM_EXEC|
 				     VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
 				     vdso_pagelist);
-	if (rc) {
+	if (ret)
 		current->mm->context.vdso_base = 0;
-		goto fail_mmapsem;
-	}
-
-	up_write(&mm->mmap_sem);
-	return 0;
 
- fail_mmapsem:
+out_up_mmap_sem:
 	up_write(&mm->mmap_sem);
-	return rc;
+	return ret;
 }
 
 const char *arch_vma_name(struct vm_area_struct *vma)
-- 
2.10.0