From: Anton Blanchard <anton@samba.org>
To: benh@kernel.crashing.org, paulus@samba.org
Cc: linuxppc-dev@lists.ozlabs.org
Subject: [PATCH] powerpc: Fix comment explaining our VSID layout
Date: Tue, 13 Dec 2011 17:16:36 +1100 [thread overview]
Message-ID: <20111213171636.3e8b8ac6@kryten> (raw)
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>
---
Index: linux-powerpc/arch/powerpc/include/asm/mmu-hash64.h
===================================================================
--- linux-powerpc.orig/arch/powerpc/include/asm/mmu-hash64.h 2011-12-13 14:47:14.498301148 +1100
+++ linux-powerpc/arch/powerpc/include/asm/mmu-hash64.h 2011-12-13 14:58:01.085510915 +1100
@@ -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
reply other threads:[~2011-12-13 6:16 UTC|newest]
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