[RFC PATCH 07/09] robust VM per_cpu i386 VM area
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- To: LKML <linux-kernel@xxxxxxxxxxxxxxx>
- Subject: [RFC PATCH 07/09] robust VM per_cpu i386 VM area
- From: Steven Rostedt <rostedt@xxxxxxxxxxx>
- Date: Wed, 17 May 2006 06:01:01 -0400 (EDT)
- Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, Nick Piggin <nickpiggin@xxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Andi Kleen <ak@xxxxxxx>, Martin Mares <mj@xxxxxxxxxxxxxxxxxxxxxxxx>, bjornw@xxxxxxxx, schwidefsky@xxxxxxxxxx, benedict.gaster@xxxxxxxxxx, lethal@xxxxxxxxxxxx, Chris Zankel <chris@xxxxxxxxxx>, Marc Gauthier <marc@xxxxxxxxxxxxx>, Joe Taylor <joe@xxxxxxxxxxxxx>, David Mosberger-Tang <davidm@xxxxxxxxxx>, rth@xxxxxxxxxxx, spyro@xxxxxxx, starvik@xxxxxxxx, tony.luck@xxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, ralf@xxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxx, grundler@xxxxxxxxxxxxxxxx, parisc-linux@xxxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxx, linux390@xxxxxxxxxx, davem@xxxxxxxxxxxxx, arnd@xxxxxxxx, kenneth.w.chen@xxxxxxxxx, sam@xxxxxxxxxxxx, clameter@xxxxxxx, kiran@xxxxxxxxxxxx
- In-reply-to: <Pine.LNX.4.58.0605170547490.8408@xxxxxxxxxxxxxxxxxxx>
- References: <Pine.LNX.4.58.0605170547490.8408@xxxxxxxxxxxxxxxxxxx>
This patch allocates the percpu VM area using the fix addresses.
It defines currently 1 meg per cpu.
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Index: linux-2.6.16-test/include/asm-i386/fixmap.h
===================================================================
--- linux-2.6.16-test.orig/include/asm-i386/fixmap.h 2006-05-17 04:32:27.000000000 -0400
+++ linux-2.6.16-test/include/asm-i386/fixmap.h 2006-05-17 04:59:34.000000000 -0400
@@ -32,6 +32,10 @@
#include <asm/kmap_types.h>
#endif
+/* One meg per cpu of VM space */
+#define PERCPU_PAGES 256
+#define PERCPU_SIZE (PERCPU_PAGES << PAGE_SHIFT)
+
/*
* Here we define all the compile-time 'special' virtual
* addresses. The point is to have a constant address at
@@ -83,6 +87,8 @@ enum fixed_addresses {
#ifdef CONFIG_PCI_MMCONFIG
FIX_PCIE_MCFG,
#endif
+ FIX_PERCPU_BEGIN,
+ FIX_PERCPU_END = FIX_PERCPU_BEGIN+(PERCPU_PAGES*NR_CPUS)-1,
__end_of_permanent_fixed_addresses,
/* temporary boot-time mappings, used before ioremap() is functional */
#define NR_FIX_BTMAPS 16
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