Return-Path: <linux-kernel-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by smtp.lore.kernel.org (Postfix) with ESMTP id EE822C433F5
	for <linux-kernel@archiver.kernel.org>; Fri, 10 Dec 2021 13:36:58 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S242144AbhLJNkc (ORCPT <rfc822;linux-kernel@archiver.kernel.org>);
        Fri, 10 Dec 2021 08:40:32 -0500
Received: from mail.loongson.cn ([114.242.206.163]:59978 "EHLO loongson.cn"
        rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP
        id S242123AbhLJNjw (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Fri, 10 Dec 2021 08:39:52 -0500
Received: from linux.localdomain (unknown [113.200.148.30])
        by mail.loongson.cn (Coremail) with SMTP id AQAAf9AxusjBV7Nh3OEFAA--.12281S4;
        Fri, 10 Dec 2021 21:36:03 +0800 (CST)
From:   Tiezhu Yang <yangtiezhu@loongson.cn>
To:     Dave Young <dyoung@redhat.com>, Baoquan He <bhe@redhat.com>,
        Vivek Goyal <vgoyal@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
        linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org,
        x86@kernel.org, linux-fsdevel@vger.kernel.org,
        kexec@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH 2/2] kdump: crashdump: use copy_to() to simplify the related code
Date:   Fri, 10 Dec 2021 21:36:01 +0800
Message-Id: <1639143361-17773-3-git-send-email-yangtiezhu@loongson.cn>
X-Mailer: git-send-email 2.1.0
In-Reply-To: <1639143361-17773-1-git-send-email-yangtiezhu@loongson.cn>
References: <1639143361-17773-1-git-send-email-yangtiezhu@loongson.cn>
X-CM-TRANSID: AQAAf9AxusjBV7Nh3OEFAA--.12281S4
X-Coremail-Antispam: 1UD129KBjvJXoW3XrW5CF1rtr1fXr4fJF17Awb_yoW7KF13pr
        1vk39ayr4Ig3Z8GasrtrnrWFW0qwn7G3W7J3yDC3WrZwnaqwnFvw1kJas2g3yjqr15KryF
        yF95Kr4Yy3y8W3DanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2
        9KBjDU0xBIdaVrnRJUUUPab7Iv0xC_Kw4lb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I2
        0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI
        8067AKxVWUXwA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF
        64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWUCVW8JwA2z4x0Y4vE2Ix0cI8IcV
        CY1x0267AKxVWxJVW8Jr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIE
        c7CjxVAFwI0_GcCE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I
        8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v26r4j6F4UMcvjeVCF
        s4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwACI402YVCY1x02628vn2kIc2xKxwCY02
        Avz4vE14v_Xr4l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAq
        x4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r
        43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF
        7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxV
        WUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjxU
        yuWlDUUUU
X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Use copy_to() to simplify the related code about copy_oldmem_page()
in arch/*/kernel/crash_dump*.c files.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 arch/arm/kernel/crash_dump.c     | 10 ++--------
 arch/arm64/kernel/crash_dump.c   | 10 ++--------
 arch/ia64/kernel/crash_dump.c    | 10 ++++------
 arch/mips/kernel/crash_dump.c    |  9 ++-------
 arch/powerpc/kernel/crash_dump.c |  7 ++-----
 arch/riscv/kernel/crash_dump.c   |  9 ++-------
 arch/sh/kernel/crash_dump.c      |  9 ++-------
 arch/x86/kernel/crash_dump_32.c  |  9 ++-------
 arch/x86/kernel/crash_dump_64.c  |  9 ++-------
 9 files changed, 20 insertions(+), 62 deletions(-)

diff --git a/arch/arm/kernel/crash_dump.c b/arch/arm/kernel/crash_dump.c
index 53cb924..6491f1d 100644
--- a/arch/arm/kernel/crash_dump.c
+++ b/arch/arm/kernel/crash_dump.c
@@ -40,14 +40,8 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 	if (!vaddr)
 		return -ENOMEM;
 
-	if (userbuf) {
-		if (copy_to_user(buf, vaddr + offset, csize)) {
-			iounmap(vaddr);
-			return -EFAULT;
-		}
-	} else {
-		memcpy(buf, vaddr + offset, csize);
-	}
+	if (copy_to(buf, vaddr + offset, csize, userbuf))
+		csize = -EFAULT;
 
 	iounmap(vaddr);
 	return csize;
diff --git a/arch/arm64/kernel/crash_dump.c b/arch/arm64/kernel/crash_dump.c
index 58303a9..496e6a5 100644
--- a/arch/arm64/kernel/crash_dump.c
+++ b/arch/arm64/kernel/crash_dump.c
@@ -38,14 +38,8 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 	if (!vaddr)
 		return -ENOMEM;
 
-	if (userbuf) {
-		if (copy_to_user((char __user *)buf, vaddr + offset, csize)) {
-			memunmap(vaddr);
-			return -EFAULT;
-		}
-	} else {
-		memcpy(buf, vaddr + offset, csize);
-	}
+	if (copy_to(buf, vaddr + offset, csize, userbuf))
+		csize = -EFAULT;
 
 	memunmap(vaddr);
 
diff --git a/arch/ia64/kernel/crash_dump.c b/arch/ia64/kernel/crash_dump.c
index 0ed3c3d..20f4c4e 100644
--- a/arch/ia64/kernel/crash_dump.c
+++ b/arch/ia64/kernel/crash_dump.c
@@ -39,13 +39,11 @@ copy_oldmem_page(unsigned long pfn, char *buf,
 
 	if (!csize)
 		return 0;
+
 	vaddr = __va(pfn<<PAGE_SHIFT);
-	if (userbuf) {
-		if (copy_to_user(buf, (vaddr + offset), csize)) {
-			return -EFAULT;
-		}
-	} else
-		memcpy(buf, (vaddr + offset), csize);
+	if (copy_to(buf, vaddr + offset, csize, userbuf))
+		return -EFAULT;
+
 	return csize;
 }
 
diff --git a/arch/mips/kernel/crash_dump.c b/arch/mips/kernel/crash_dump.c
index 2e50f551..80704dc 100644
--- a/arch/mips/kernel/crash_dump.c
+++ b/arch/mips/kernel/crash_dump.c
@@ -24,13 +24,8 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 		return 0;
 
 	vaddr = kmap_local_pfn(pfn);
-
-	if (!userbuf) {
-		memcpy(buf, vaddr + offset, csize);
-	} else {
-		if (copy_to_user(buf, vaddr + offset, csize))
-			csize = -EFAULT;
-	}
+	if (copy_to(buf, vaddr + offset, csize, userbuf))
+		csize = -EFAULT;
 
 	kunmap_local(vaddr);
 
diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c
index 5693e1c67..43b2658 100644
--- a/arch/powerpc/kernel/crash_dump.c
+++ b/arch/powerpc/kernel/crash_dump.c
@@ -71,11 +71,8 @@ void __init setup_kdump_trampoline(void)
 static size_t copy_oldmem_vaddr(void *vaddr, char *buf, size_t csize,
                                unsigned long offset, int userbuf)
 {
-	if (userbuf) {
-		if (copy_to_user((char __user *)buf, (vaddr + offset), csize))
-			return -EFAULT;
-	} else
-		memcpy(buf, (vaddr + offset), csize);
+	if (copy_to(buf, vaddr + offset, csize, userbuf))
+		return -EFAULT;
 
 	return csize;
 }
diff --git a/arch/riscv/kernel/crash_dump.c b/arch/riscv/kernel/crash_dump.c
index 86cc0ad..707fbc1 100644
--- a/arch/riscv/kernel/crash_dump.c
+++ b/arch/riscv/kernel/crash_dump.c
@@ -33,13 +33,8 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 	if (!vaddr)
 		return -ENOMEM;
 
-	if (userbuf) {
-		if (copy_to_user((char __user *)buf, vaddr + offset, csize)) {
-			memunmap(vaddr);
-			return -EFAULT;
-		}
-	} else
-		memcpy(buf, vaddr + offset, csize);
+	if (copy_to(buf, vaddr + offset, csize, userbuf))
+		csize = -EFAULT;
 
 	memunmap(vaddr);
 	return csize;
diff --git a/arch/sh/kernel/crash_dump.c b/arch/sh/kernel/crash_dump.c
index 5b41b59..2af9286 100644
--- a/arch/sh/kernel/crash_dump.c
+++ b/arch/sh/kernel/crash_dump.c
@@ -33,13 +33,8 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 
 	vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
 
-	if (userbuf) {
-		if (copy_to_user((void __user *)buf, (vaddr + offset), csize)) {
-			iounmap(vaddr);
-			return -EFAULT;
-		}
-	} else
-	memcpy(buf, (vaddr + offset), csize);
+	if (copy_to(buf, vaddr + offset, csize, userbuf))
+		csize = -EFAULT;
 
 	iounmap(vaddr);
 	return csize;
diff --git a/arch/x86/kernel/crash_dump_32.c b/arch/x86/kernel/crash_dump_32.c
index 5fcac46..731658b 100644
--- a/arch/x86/kernel/crash_dump_32.c
+++ b/arch/x86/kernel/crash_dump_32.c
@@ -54,13 +54,8 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
 		return -EFAULT;
 
 	vaddr = kmap_local_pfn(pfn);
-
-	if (!userbuf) {
-		memcpy(buf, vaddr + offset, csize);
-	} else {
-		if (copy_to_user(buf, vaddr + offset, csize))
-			csize = -EFAULT;
-	}
+	if (copy_to(buf, vaddr + offset, csize, userbuf))
+		csize = -EFAULT;
 
 	kunmap_local(vaddr);
 
diff --git a/arch/x86/kernel/crash_dump_64.c b/arch/x86/kernel/crash_dump_64.c
index a7f617a..8e7c192 100644
--- a/arch/x86/kernel/crash_dump_64.c
+++ b/arch/x86/kernel/crash_dump_64.c
@@ -29,13 +29,8 @@ static ssize_t __copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
 	if (!vaddr)
 		return -ENOMEM;
 
-	if (userbuf) {
-		if (copy_to_user((void __user *)buf, vaddr + offset, csize)) {
-			iounmap((void __iomem *)vaddr);
-			return -EFAULT;
-		}
-	} else
-		memcpy(buf, vaddr + offset, csize);
+	if (copy_to(buf, vaddr + offset, csize, userbuf))
+		csize = -EFAULT;
 
 	set_iounmap_nonlazy();
 	iounmap((void __iomem *)vaddr);
-- 
2.1.0