linux-kernel - [PATCH 5/8] initramfs: cleanup populate

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Message-Id: <20190213174621.29297-6-hch@lst.de>
Date:   Wed, 13 Feb 2019 18:46:18 +0100
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Guan Xuetao <gxt@....edu.cn>,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/8] initramfs: cleanup populate_rootfs

The code for kernels that support ramdisks or not is mostly the
same.  Unify it by using an IS_ENABLED for the info message, and
moving the error message into a stub for populate_initrd_image.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 init/initramfs.c | 33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/init/initramfs.c b/init/initramfs.c
index c2e9a8845e98..c55e08f72fad 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -615,6 +615,11 @@ static void populate_initrd_image(char *err)
 		       written, initrd_end - initrd_start);
 	ksys_close(fd);
 }
+#else
+static void populate_initrd_image(char *err)
+{
+	printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
+}
 #endif /* CONFIG_BLK_DEV_RAM */
 
 static int __init populate_rootfs(void)
@@ -623,30 +628,22 @@ static int __init populate_rootfs(void)
 	char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
 	if (err)
 		panic("%s", err); /* Failed to decompress INTERNAL initramfs */
-	/* If available load the bootloader supplied initrd */
-	if (initrd_start && !IS_ENABLED(CONFIG_INITRAMFS_FORCE)) {
-#ifdef CONFIG_BLK_DEV_RAM
+
+	if (!initrd_start || IS_ENABLED(CONFIG_INITRAMFS_FORCE))
+		goto done;
+
+	if (IS_ENABLED(CONFIG_BLK_DEV_RAM))
 		printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
-		err = unpack_to_rootfs((char *)initrd_start,
-			initrd_end - initrd_start);
-		if (!err)
-			goto done;
+	else
+		printk(KERN_INFO "Unpacking initramfs...\n");
 
+	err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start);
+	if (err) {
 		clean_rootfs();
 		populate_initrd_image(err);
-	done:
-		/* empty statement */;
-#else
-		printk(KERN_INFO "Unpacking initramfs...\n");
-		err = unpack_to_rootfs((char *)initrd_start,
-			initrd_end - initrd_start);
-		if (err) {
-			printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
-			clean_rootfs();
-		}
-#endif
 	}
 
+done:
 	/*
 	 * If the initrd region is overlapped with crashkernel reserved region,
 	 * free only memory that is not part of crashkernel region.
-- 
2.20.1