Re: Tiger oops in ia64_sal_physical_id_info (was [RFC] regression:113134fcbca83619be4c68d0ca66db6093

[Matthew Wilcox <matthew@wil.cx>]

On Tue, Feb 26, 2008 at 04:50:48PM -0700, Alex Chiang wrote:
> I believe that the current implementation of check_versions()
> does the proper workaround for this bug?
> 
>         /* Check for broken firmware */
>         if ((sal_revision = SAL_VERSION_CODE(49, 29))
>             && (sal_version = SAL_VERSION_CODE(49, 29)))
>         {

Oh, there were many other broken versions available ;-)  I believe this
particular workaround was for a machine David Mosberger had that
couldn't be upgraded.

> In light of that, how about this patch? It allows my Tiger to
> boot.
> 
> /ac
> 
> From: Alex Chiang <achiang@hp.com>
> Subject: [PATCH] ia64: ia64_sal_physical_id_info work around broken SAL
> 
> Unimplemented SAL calls should return -1, but on at least one
> platform (Tiger with SAL v3.1), attempting to call SAL_PHYSICAL_ID_INFO
> (which was defined in SAL v3.2 and later) results in an oops and
> a hang.
> 
> Signed-off-by: Alex Chiang <achiang@hp.com>

Acked-by: Matthew Wilcox <willy@linux.intel.com>

> ---
> diff --git a/include/asm-ia64/sal.h b/include/asm-ia64/sal.h
> index 2251118..f4904db 100644
> --- a/include/asm-ia64/sal.h
> +++ b/include/asm-ia64/sal.h
> @@ -807,6 +807,10 @@ static inline s64
>  ia64_sal_physical_id_info(u16 *splid)
>  {
>         struct ia64_sal_retval isrv;
> +
> +       if (sal_revision < SAL_VERSION_CODE(3,2))
> +               return -1;
> +
>         SAL_CALL(isrv, SAL_PHYSICAL_ID_INFO, 0, 0, 0, 0, 0, 0, 0);
>         if (splid)
>                 *splid = isrv.v0;
> 
> -
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