[uml-devel] [PATCH 4/6] x86_64: fix L1_CACHE_SHIFT_MAX for Intel EM64T [for 2.6.14?]

["Paolo 'Blaisorblade' Giarrusso" <blaisorblade@yahoo.it>]

From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>

The current value was correct before the introduction of Intel EM64T support -
but now L1_CACHE_SHIFT_MAX can be less than L1_CACHE_SHIFT, which _is_ funny!

Between the few users of ____cacheline_maxaligned_in_smp, we also have (for
example) rcu_ctrlblk, and struct zone, with zone->{lru_,}lock. I.e. we have a
lot of excess cacheline bouncing on them.

No correctness issues, obviously. So this could even be merged for 2.6.14 (I'm
not a fan of this idea, though).

CC: Andi Kleen <ak@suse.de>
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
---

 include/asm-x86_64/cache.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/asm-x86_64/cache.h b/include/asm-x86_64/cache.h
--- a/include/asm-x86_64/cache.h
+++ b/include/asm-x86_64/cache.h
@@ -9,6 +9,6 @@
 /* L1 cache line size */
 #define L1_CACHE_SHIFT	(CONFIG_X86_L1_CACHE_SHIFT)
 #define L1_CACHE_BYTES	(1 << L1_CACHE_SHIFT)
-#define L1_CACHE_SHIFT_MAX 6	/* largest L1 which this arch supports */
+#define L1_CACHE_SHIFT_MAX 7	/* largest L1 which this arch supports */
 
 #endif



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