Franck Bui-Huu wrote: > Thiemo Seufer wrote: >> Franck Bui-Huu wrote: >>> Atsushi, >>> >>> Franck Bui-Huu wrote: >>>> Signed-off-by: Franck Bui-Huu <fbuihuu@xxxxxxxxx> >>>> --- >>> [snip] >>>> @@ -176,24 +174,34 @@ static unsigned long __init init_initrd( >>> [snip] >>>> end = (unsigned long)&_end; >>>> tmp = PAGE_ALIGN(end) - sizeof(u32) * 2; >>>> if (tmp < end) >>>> tmp += PAGE_SIZE; >>>> >>> Any idea on what is this code for ? >>> It seems that a minimum gap is needed betweend the end of kernel >>> code and initrd but I don't see why... >> AFAIR the bootmem map is placed there. >> > > boot_mem_map[] seems to be located in bss. > ok I think I got it... Actually sizeof(u32) * 2 is the place reserved for the initrd header and this header is right before initrd itself. initrd_header[0] -> magic number initrd_header[1] -> size of initrd initrd start ... initrd end and initrd start must be PAGE_SIZE aligned, surely because we free it with a page granularity. Franck
