On 07/10/2013 06:32 PM, Mahesh J Salgaonkar wrote: > From: Mahesh Salgaonkar <[email protected]> > > During Machine Check interrupt on pseries platform, R3 generally points to > memory region inside RTAS (FWNMI) area. We see r3 corruption because when RTAS > delivers the machine check exception it passes the address inside FWNMI area > with the top most bit set. This patch fixes this issue by masking top two bit > in machine check exception handler. > > Signed-off-by: Mahesh Salgaonkar <[email protected]> > --- > arch/powerpc/platforms/pseries/ras.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/powerpc/platforms/pseries/ras.c > b/arch/powerpc/platforms/pseries/ras.c > index 7b3cbde..721c058 100644 > --- a/arch/powerpc/platforms/pseries/ras.c > +++ b/arch/powerpc/platforms/pseries/ras.c > @@ -287,6 +287,9 @@ static struct rtas_error_log *fwnmi_get_errinfo(struct > pt_regs *regs) > unsigned long *savep; > struct rtas_error_log *h, *errhdr = NULL; > > + /* Mask top two bits */ > + regs->gpr[3] &= ~(0x3UL << 62);
We need to replace this "62" with a shift macro specifying the significance of these top two address bits in the real mode. _______________________________________________ Linuxppc-dev mailing list [email protected] https://lists.ozlabs.org/listinfo/linuxppc-dev
