• Linus Torvalds's avatar
    [module] Don't let gcc inline load_module() · ffb4ba76
    Linus Torvalds authored
    
    
    'load_module()' is a complex function that contains all the ELF section
    logic, and inlining it is utterly insane.  But gcc will do it, simply
    because there is only one call-site.  As a result, all the stack space
    that is allocated for all the work to load the module will still be
    active when we actually call the module init sequence, and the deep call
    chain makes stack overflows happen.
    
    And stack overflows are really hard to debug, because they not only
    corrupt random pages below the stack, but also corrupt the thread_info
    structure that is allocated under the stack.
    
    In this case, Alan Brunelle reported some crazy oopses at bootup, after
    loading the processor module that ends up doing complex ACPI stuff and
    has quite a deep callchain.  This should fix it, and is the sane thing
    to do regardless.
    
    Cc: Alan D. Brunelle <Alan.Brunelle@hp.com>
    Cc: Arjan van de Ven <arjan@linux.intel.com>
    Cc: Rusty Russell <rusty@rustcorp.com.au>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    ffb4ba76