[PATCH] 2.6.39 powerpc: Fix 32-bit SMP build

[Benjamin Herrenschmidt]

On Mon, 2011-05-30 at 08:26 -0400, Josh Boyer wrote:
> Backport upstream commit 6de06f313a65d0ec
>     
> Commit fa3f82c8bb7acb ("powerpc/smp: soft-replugged CPUs must go back to
> start_secondary") introduced start_secondary_resume to head_32.S, however
> it uses a 64-bit instruction which is not valid on 32-bit platforms.  Use
> 'stw' instead.
>     
> CC: stable at kernel.org
> Signed-off-by: Josh Boyer <jwboyer at linux.vnet.ibm.com>

Acked-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>

> ---
> 
> diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
> index c5c24be..727f40a 100644
> --- a/arch/powerpc/kernel/head_32.S
> +++ b/arch/powerpc/kernel/head_32.S
> @@ -896,7 +896,7 @@ _GLOBAL(start_secondary_resume)
>  	rlwinm  r1,r1,0,0,(31-THREAD_SHIFT)     /* current_thread_info() */
>  	addi    r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
>  	li      r3,0
> -	std     r3,0(r1)                /* Zero the stack frame pointer */
> +	stw     r3,0(r1)                /* Zero the stack frame pointer */
>  	bl      start_secondary
>  	b       .
>  #endif /* CONFIG_SMP */