Re: [patch 2.6.11-rc3-bk4] Correctly dereference ia64_mca_data

From: Russ Anderson <>
Date: 2005-02-12 01:53:03
Keith Owens wrote:
> As davidm has pointed out, if the OS MCA handler saves the scratch and
> preserved registers before calling C and restores the values before
> returning to SAL then we have no problems.  By definition, the only
> registers that matter are those in struct pt_regs.  Think of an MCA as
> just another type of interrupt, with exactly the same requirements for
> saving registers.

That sounds like the right approach.

> I am completely dropping the proc_state_dump data area and 90% of the
> code in os_mca_dump/restore.  Instead of saving everything in sight, I
> create a struct pt_regs from the current registers plus some data from
> the min_state_save area.  That has three benefits - it gets rid of the
> special case RSE stack frame, it gives a real pt_regs for unwinding
> through the MCA handler and it guarantees that we save the required set
> of registers.

Thanks, Keith.

Russ Anderson, OS RAS/Partitioning Project Lead  
SGI - Silicon Graphics Inc
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Received on Fri Feb 11 09:55:12 2005

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