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    SubjectKernel Bug in 2.4.35 when compiled gcc>=4.2.0 and -march=c3
    Date
    i found a bug in linux-2.4.35.

    the bug produces a crashing kernel when compiled
    with gcc >=4.2.0 and VIA C3 optimized -march=c3
    (CONFIG_MCYRIXIII=y)

    this issue was first discussed on the gcc bugzilla:
    http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32264

    and tracked down to the include/asm-i386/hw_irq.h
    module with the help of the gcc guys:

    (pluto at agmk dot net) wrote:
    >yup, i see something new :)
    >
    >please look at line 12137 of i8259.i:
    >
    >__attribute__((regparm(0))) void call_do_IRQ(void); __asm__(...
    >
    >as you can see there is a semicolon after call_do_IRQ(void)
    >and following asm statement isn't treated as a function body.
    >in this way -O1 -f{no-}unit-at-a-time accidentally produces
    >different code. it's not a gcc bug.
    >
    >linux-2.4.35/include/asm-i386/hw_irq.h
    >contains these evil macros.

    is there a chance to fix this?
    these macros a far beyond my capabilities to fix.

    Axel
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