On Thu, 07 Dec 2006 11:18:43 +1100
Michael Neuling <[email protected]> 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
>
> --- 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;
> }
I'd have thought that an option `retain_initrd' would make more sense.
Please always update Documentation/kernel-parameters.txt when adding boot
options.
-
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