linux-kernel - Re: [PATCH] Use directly kmalloc() and kfree() in init/initramfs.c

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Date:	Fri, 15 Feb 2008 16:45:03 +0100
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, mpm@...enic.com
Subject: Re: [PATCH] Use directly kmalloc() and kfree() in init/initramfs.c

Hi,

Le Fri, 15 Feb 2008 15:46:47 +0100 (CET),
Jan Engelhardt <jengelh@...putergmbh.de> a écrit :

> Remove the cast while you are at it, thanks :)

Right, thanks for the comment. Here is an updated patch. Who will pick
it up ? There doesn't seem to be a maintainer for the initramfs code
(not in MAINTAINERS, not in the init/initramfs.c file itself).

Thanks,

Thomas

---

Instead of using the malloc() and free() wrappers needed by the
lib/inflate.c code for allocations, simply use kmalloc() and kfree() in
the initramfs code. This is needed for a further lib/inflate.c-related
cleanup patch that will remove the malloc() and free() functions.

Take that opportunity to remove the useless kmalloc() return value
cast.

Based of work done by Matt Mackall <mpm@...enic.com>.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
---
 init/initramfs.c |   20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

Index: linux/init/initramfs.c
===================================================================
--- linux.orig/init/initramfs.c
+++ linux/init/initramfs.c
@@ -57,7 +57,7 @@
 			continue;
 		return (*p)->name;
 	}
-	q = (struct hash *)malloc(sizeof(struct hash));
+	q = kmalloc(sizeof(struct hash), GFP_KERNEL);
 	if (!q)
 		panic("can't allocate link hash entry");
 	q->major = major;
@@ -77,7 +77,7 @@
 		while (*p) {
 			q = *p;
 			*p = q->next;
-			free(q);
+			kfree(q);
 		}
 	}
 }
@@ -445,10 +445,10 @@
 {
 	int written;
 	dry_run = check_only;
-	header_buf = malloc(110);
-	symlink_buf = malloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1);
-	name_buf = malloc(N_ALIGN(PATH_MAX));
-	window = malloc(WSIZE);
+	header_buf = kmalloc(110, GFP_KERNEL);
+	symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
+	name_buf = kmalloc(N_ALIGN(PATH_MAX), GFP_KERNEL);
+	window = kmalloc(WSIZE, GFP_KERNEL);
 	if (!window || !header_buf || !symlink_buf || !name_buf)
 		panic("can't allocate buffers");
 	state = Start;
@@ -484,10 +484,10 @@
 		buf += inptr;
 		len -= inptr;
 	}
-	free(window);
-	free(name_buf);
-	free(symlink_buf);
-	free(header_buf);
+	kfree(window);
+	kfree(name_buf);
+	kfree(symlink_buf);
+	kfree(header_buf);
 	return message;
 }
 


-- 
Thomas Petazzoni, Free Electrons
Free Embedded Linux Training Materials
on http://free-electrons.com/training
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