Re: [PATCH 2/2] powerpc: Make context bits depend on virtual addr size.
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2013-02-12 20:33:13
On Wed, 2013-02-13 at 00:01 +0530, Aneesh Kumar K.V wrote:
+ * Be careful with this value. This determines the VSID_MODULUS_* and that + * need to be co-prime with VSID_MULTIPLIER* + */ +#if defined(CONFIG_POWER6_CPU) || defined(CONFIG_POWER7_CPU) +/* + * Even if cpu support 68 bits, we limit this to 66 because + * we support only 2^19 context. + */ +#define MAX_VIRTUAL_ADDR_BITS 66 +#else +/* power4,power 5 and cell is 65 */ +#define MAX_VIRTUAL_ADDR_BITS 65 +#endif +
A compile option ? Really ? Ugh... Ben.