Subject: Re: [PATCH] powerpc: pseries: Fix kexec on machines with more than 4TB of RAM

From: Michael Neuling <[email-masked]>
Date: Wed, 27 Jul 2011 14:26:10 +1000

> On a box with 8TB of RAM the MMU hashtable is 64GB in size. That
> means we have 4G PTEs. pSeries_lpar_hptab_clear was using a signed
> int to store the index which will overflow at 2G.

Wow, I hear... "Anton Blanchard's machine has more memory in it's MMU
than you have in total".

Acked-by: Michael Neuling <[email-masked]>

> 
> Signed-off-by: Anton Blanchard <[email-masked]>
> Cc: <[email-masked]>
> ---
> 
> Index: linux-powerpc/arch/powerpc/platforms/pseries/lpar.c
> ===================================================================
> --- linux-powerpc.orig/arch/powerpc/platforms/pseries/lpar.c	2011-07-27 13:5
0:18.408091576 +1000
> +++ linux-powerpc/arch/powerpc/platforms/pseries/lpar.c	2011-07-27 13:5
1:19.359196131 +1000
> @@ -203,7 +203,7 @@ static void pSeries_lpar_hptab_clear(voi
>  		unsigned long ptel;
>  	} ptes[4];
>  	long lpar_rc;
> -	int i, j;
> +	unsigned long i, j;
>  
>  	/* Read in batches of 4,
>  	 * invalidate only valid entries not in the VRMA
>