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powerpc: Fix comment explaining our VSID layout

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We support 16TB of user address space and half a million contexts
so update the comment to reflect this.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2011-12-12 20:16:36 +00:00 committed by Benjamin Herrenschmidt
parent 9f5072d4f6
commit b206590c04
1 changed files with 3 additions and 4 deletions
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7
arch/powerpc/include/asm/mmu-hash64.h
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@ -312,10 +312,9 @@ extern void slb_set_size(u16 size);
* (i.e. everything above 0xC000000000000000), except the very top
* segment, which simplifies several things.
*
* - We allow for 15 significant bits of ESID and 20 bits of
* context for user addresses. i.e. 8T (43 bits) of address space for
* up to 1M contexts (although the page table structure and context
* allocation will need changes to take advantage of this).
* - We allow for 16 significant bits of ESID and 19 bits of
* context for user addresses. i.e. 16T (44 bits) of address space for
* up to half a million contexts.
*
* - The scramble function gives robust scattering in the hash
* table (at least based on some initial results). The previous