[patch 3/3] cell: prevent alignment interrupt on local store

Akinobu Mita mita at fixstars.com
Wed Apr 11 12:56:05 EST 2007

On Wed, Apr 11, 2007 at 07:22:48AM +1000, Benjamin Herrenschmidt wrote:
> On Tue, 2007-04-10 at 20:15 +0900, Akinobu Mita wrote:
> > An Alignment interrupt occurs when the instruction is lmw, stmw, lswi, lswx,
> > stswi, or stswx, and the operand is in local store.
> > 
> > GCC generated such instructions to handle memcpy() instead of kernel
> > defined memcpy() without -mno-string option.
> > 
> > Signed-off-by: Akinobu Mita <mita at fixstars.com>
> I would personally prefer building the entire kernel with -mno-string
> when cell support is enabled...

I'm about to resend the patch which prevent alignment interrupts on LS
by using memcpy_fromio() rather than putting a collection of -mno-* options
in Makefile. (only -mno-string is not enough to prevent that as Segher said)

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