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    SubjectRe: SOLVED: BUG: Kernel Panic: kernel-2.6.0-test9-bk21 for alpha in scsi context ll_rw_blk.c
    Hi

    With the patch from Ivan, the prefetch problem is gone.
    Please add this patch to the mainline for 2.6.0 for alpha.

    Regards
    Tom

    > We shouldn't prefetch the spinlocks on UP.
    >
    > Ivan.
    >
    > --- 2.6/include/asm-alpha/processor.h Sat Oct 25 22:44:54 2003
    > +++ linux/include/asm-alpha/processor.h Tue Nov 18 01:48:39 2003
    > @@ -78,6 +78,11 @@ unsigned long get_wchan(struct task_stru
    > #define ARCH_HAS_PREFETCHW
    > #define ARCH_HAS_SPINLOCK_PREFETCH
    >
    > +#ifndef CONFIG_SMP
    > +/* Nothing to prefetch. */
    > +#define spin_lock_prefetch(lock) do { } while (0)
    > +#endif
    > +
    > #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)
    > extern inline void prefetch(const void *ptr)
    > {
    > @@ -89,10 +94,13 @@ extern inline void prefetchw(const void
    > __builtin_prefetch(ptr, 1, 3);
    > }
    >
    > +#ifdef CONFIG_SMP
    > extern inline void spin_lock_prefetch(const void *ptr)
    > {
    > __builtin_prefetch(ptr, 1, 3);
    > }
    > +#endif
    > +
    > #else
    > extern inline void prefetch(const void *ptr)
    > {
    > @@ -104,10 +112,13 @@ extern inline void prefetchw(const void
    > __asm__ ("ldq $31,%0" : : "m"(*(char *)ptr));
    > }
    >
    > +#ifdef CONFIG_SMP
    > extern inline void spin_lock_prefetch(const void *ptr)
    > {
    > __asm__ ("ldq $31,%0" : : "m"(*(char *)ptr));
    > }
    > +#endif
    > +
    > #endif /* GCC 3.1 */
    >
    > #endif /* __ASM_ALPHA_PROCESSOR_H */

    --
    Tom

    LINUX user since kernel 0.99.x 1994.
    RPM Alpha packages at http://alpha.steudten.com/packages
    Want to know what S.u.S.E 1995 cdrom-set contains?


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