Hang with isync

[Manoj Sharma]

>
> Hi,
>
> We use linux kernel 2.4.20 on ppc405 and the system hangs once in a while
> when isync gets called in this function:
>
> _GLOBAL(_nmask_and_or_msr)
>     mfmsr   r0      /* Get current msr */
>     andc    r0,r0,r3    /* And off the bits set in r3 (first parm) */
>     or  r0,r0,r4    /* Or on the bits in r4 (second parm) */
>     sync            /* Some chip revs have problems here... */
>     isync
>     mtmsr   r0      /* Update machine state */
>     isync
>     blr         /* Done */
>
>  2.5 onwards, I find that "sync; isync" has been replaced by a macro SYNC
> (defined only for 601). I don't find it in any changelog and reason for the
> change.
>
> Can someone give some information on this change?
>
> Appreciate any help.
> Manoj
>
> <linuxppc-dev at ozlabs.org>
>
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