Re: [PATCH] free initrds boot option

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Michael Neuling wrote:

Add free_initrd= option to control freeing of initrd memory after
extraction.  By default, free memory as previously.

Signed-off-by: Michael Neuling <[email protected]>
---
Useful for kexec when you want to reuse the same initrd.  Testing on
POWERPC with CPIOs
This option (free_initrd) will not work if the user loads the kdump kernel and does the normal kexec boot later on powerpc. The reason is initrd will be loaded by yaboot at 36MB and kdump image at 32M (Right now it is fixed). It could be possible that we will end up overwriting initrd.

init/initramfs.c |   18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)

Index: linux-2.6-ozlabs/init/initramfs.c
===================================================================
--- linux-2.6-ozlabs.orig/init/initramfs.c
+++ linux-2.6-ozlabs/init/initramfs.c
@@ -487,6 +487,17 @@ static char * __init unpack_to_rootfs(ch
	return message;
}

+static int do_free_initrd = 1;
+
+int __init free_initrd_param(char *p)
+{
+	if (p && strncmp(p, "0", 1) == 0)
+		do_free_initrd = 0;
+
+	return 0;
+}
+early_param("free_initrd", free_initrd_param);
+
extern char __initramfs_start[], __initramfs_end[];
#ifdef CONFIG_BLK_DEV_INITRD
#include <linux/initrd.h>
@@ -494,10 +505,13 @@ extern char __initramfs_start[], __initr

static void __init free_initrd(void)
{
-#ifdef CONFIG_KEXEC
	unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
	unsigned long crashk_end   = (unsigned long)__va(crashk_res.end);

+	if (!do_free_initrd)
+		goto skip;
+
+#ifdef CONFIG_KEXEC
	/*
	 * If the initrd region is overlapped with crashkernel reserved region,
	 * free only memory that is not part of crashkernel region.
@@ -515,7 +529,7 @@ static void __init free_initrd(void)
	} else
#endif
		free_initrd_mem(initrd_start, initrd_end);
-
+skip:
	initrd_start = 0;
	initrd_end = 0;
}
-
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