Commit:     0a7b35cb18c52d651f6ed9cd59edc979200ab880
Parent:     70e840499aae90be1de542894062ad2899d23642
Author:     Michael Neuling <[EMAIL PROTECTED]>
AuthorDate: Sat Feb 10 01:44:33 2007 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Sun Feb 11 10:51:24 2007 -0800

    [PATCH] Add retain_initrd boot option
    Add retain_initrd option to control freeing of initrd memory after
    extraction.  By default, free memory as previously.
    The first boot will need to hold a copy of the in memory fs for the second
    boot.  This image can be large (much larger than the kernel), hence we can
    save time when the memory loader is slow.  Also, it reduces the memory
    footprint while extracting the first boot since you don't need another copy
    of the fs.
    Signed-off-by: Michael Neuling <[EMAIL PROTECTED]>
    Cc: "Randy.Dunlap" <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
 Documentation/kernel-parameters.txt |    2 ++
 init/initramfs.c                    |   17 ++++++++++++++++-
 2 files changed, 18 insertions(+), 1 deletions(-)

diff --git a/Documentation/kernel-parameters.txt 
index 25d2985..d25acd5 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1396,6 +1396,8 @@ and is between 256 and 4096 characters. It is defined in 
the file
                        in <PAGE_SIZE> units (needed only for swap files).
                        See  Documentation/power/swsusp-and-swap-files.txt
+       retain_initrd   [RAM] Keep initrd memory after extraction
        rhash_entries=  [KNL,NET]
                        Set number of hash buckets for route cache
diff --git a/init/initramfs.c b/init/initramfs.c
index 4fa0f79..00eff7a 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -491,6 +491,17 @@ static char * __init unpack_to_rootfs(char *buf, unsigned 
len, int check_only)
        return message;
+static int __initdata do_retain_initrd;
+static int __init retain_initrd_param(char *str)
+       if (*str)
+               return 0;
+       do_retain_initrd = 1;
+       return 1;
+__setup("retain_initrd", retain_initrd_param);
 extern char __initramfs_start[], __initramfs_end[];
 #include <linux/initrd.h>
@@ -501,7 +512,11 @@ static void __init free_initrd(void)
        unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
        unsigned long crashk_end   = (unsigned long)__va(crashk_res.end);
+       if (do_retain_initrd)
+               goto skip;
         * If the initrd region is overlapped with crashkernel reserved region,
         * free only memory that is not part of crashkernel region.
@@ -519,7 +534,7 @@ static void __init free_initrd(void)
        } else
                free_initrd_mem(initrd_start, initrd_end);
        initrd_start = 0;
        initrd_end = 0;
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