1. 02 Oct, 2006 7 commits
  2. 01 Oct, 2006 29 commits
  3. 30 Sep, 2006 2 commits
  4. 29 Sep, 2006 2 commits
    • Andi Kleen's avatar
    • Vivek Goyal's avatar
      [PATCH] Re-positioning the bss segment · 120b1142
      Vivek Goyal authored
      
      
      [AK: This apparently broke some systems, but we need it to fix
      a compile problem with old binutils and in theory the patch
      is correct. So let's trying reenabling it again.]
      
      o Currently bss segment is being placed somewhere in the middle (after .data)
        section and after bss lots of init section and data sections are coming.
        Is it intentional?
      
      o One side affect of placing bss in the middle is that objcopy keeps the
        bss in raw binary image (vmlinux.bin) hence unnecessarily increasing
        the size of raw binary image. (In my case ~600K). It also increases
        the size of generated bzImage, though the increase is very small
        (896 bytes), probably a very high compression ratio for stream
        of zeros.
      
      o This patch moves the bss at the end hence reducing the size of
        bzImage by 896 bytes and size of vmlinux.bin by 600K.
      
      o This change benefits in the context of relocatable kernel patches. If
        kernel bss is not part of compressed data (vmlinux.bin) then it does
        not have to be decompressed and this area can be used by the decompressor
        for its execution hence keeping the memory requirements bounded and
        decompressor code does not stomp over any other data loaded beyond
        kernel image (As might be the case with bootloaders like kexec).
      Signed-off-by: default avatarVivek Goyal <vgoyal@in.ibm.com>
      Signed-off-by: default avatarAndi Kleen <ak@suse.de>
      120b1142