• Yinghai Lu's avatar
    initramfs: support initramfs that is bigger than 2GiB · d97b07c5
    Yinghai Lu authored
    Now with 64bit bzImage and kexec tools, we support ramdisk that size is
    bigger than 2g, as we could put it above 4G.
    
    Found compressed initramfs image could not be decompressed properly.  It
    turns out that image length is int during decompress detection, and it
    will become < 0 when length is more than 2G.  Furthermore, during
    decompressing len as int is used for inbuf count, that has problem too.
    
    Change len to long, that should be ok as on 32 bit platform long is
    32bits.
    
    Tested with following compressed initramfs image as root with kexec.
    	gzip, bzip2, xz, lzma, lzop, lz4.
    run time for populate_rootfs():
       size        name       Nehalem-EX  Westmere-EX  Ivybridge-EX
     9034400256 root_img     :   26s           24s          30s
     3561095057 root_img.lz4 :   28s           27s          27s
     3459554629 root_img.lzo :   29s           29s          28s
     3219399480 root_img.gz  :   64s           62s          49s
     2251594592 root_img.xz  :  262s          260s         183s
     2226366598 root_img.lzma:  386s          376s         277s
     2901482513 root_img.bz2 :  635s          599s
    Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Rashika Kheria <rashika.kheria@gmail.com>
    Cc: Josh Triplett <josh@joshtriplett.org>
    Cc: Kyungsik Lee <kyungsik.lee@lge.com>
    Cc: P J P <ppandit@redhat.com>
    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
    Cc: "Daniel M. Weeks" <dan@danweeks.net>
    Cc: Alexandre Courbot <acourbot@nvidia.com>
    Cc: Jan Beulich <JBeulich@suse.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    d97b07c5
unlzo.h 240 Bytes