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[IA64] bte_copy of BTE_MAX_XFER trips BUG_ON.

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BTE_MAX_XFER is wrong.  It is one greater than the number of cache
lines the BTE is actually able to transfer.  If you request a transfer
of exactly BTE_MAX_XFER size, you trip a very cryptic BUG_ON() which
should certainly be made more clear.

This patch fixes that constant and also cleans up the BUG_ON()s in
arch/ia64/sn/kernel/bte.c to test one condition per line.

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Tony Luck <aegl@agluck-desktop.(none)>
This commit is contained in:
Robin Holt
2009-02-03 18:40:59 -06:00
committed by Tony Luck
parent 334f85b647
commit 39d481cba2
2 changed files with 5 additions and 4 deletions
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2
arch/ia64/include/asm/sn/bte.h
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@ -39,7 +39,7 @@
/* BTE status register only supports 16 bits for length field */
#define BTE_LEN_BITS (16)
#define BTE_LEN_MASK ((1 << BTE_LEN_BITS) - 1)
#define BTE_MAX_XFER ((1 << BTE_LEN_BITS) * L1_CACHE_BYTES)
#define BTE_MAX_XFER (BTE_LEN_MASK << L1_CACHE_SHIFT)
/* Define hardware */