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authorRobin Holt <holt@sgi.com>2009-02-03 18:40:59 -0600
committerTony Luck <aegl@agluck-desktop.(none)>2009-02-19 11:29:31 -0800
commit39d481cba27809598e755e184bc0d8ae1d22423e (patch)
tree15087a039ccdb05749e099e1a1a7ae39e3887a55
parent334f85b647bc46ff4d27ace55aa65f44d6a2f4db (diff)
downloadop-kernel-dev-39d481cba27809598e755e184bc0d8ae1d22423e.zip
op-kernel-dev-39d481cba27809598e755e184bc0d8ae1d22423e.tar.gz
[IA64] bte_copy of BTE_MAX_XFER trips BUG_ON.
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)>
-rw-r--r--arch/ia64/include/asm/sn/bte.h2
-rw-r--r--arch/ia64/sn/kernel/bte.c7
2 files changed, 5 insertions, 4 deletions
diff --git a/arch/ia64/include/asm/sn/bte.h b/arch/ia64/include/asm/sn/bte.h
index 5efecf0..96798d2 100644
--- a/arch/ia64/include/asm/sn/bte.h
+++ b/arch/ia64/include/asm/sn/bte.h
@@ -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 */
diff --git a/arch/ia64/sn/kernel/bte.c b/arch/ia64/sn/kernel/bte.c
index 9456d40..c6d6b62 100644
--- a/arch/ia64/sn/kernel/bte.c
+++ b/arch/ia64/sn/kernel/bte.c
@@ -97,9 +97,10 @@ bte_result_t bte_copy(u64 src, u64 dest, u64 len, u64 mode, void *notification)
return BTE_SUCCESS;
}
- BUG_ON((len & L1_CACHE_MASK) ||
- (src & L1_CACHE_MASK) || (dest & L1_CACHE_MASK));
- BUG_ON(!(len < ((BTE_LEN_MASK + 1) << L1_CACHE_SHIFT)));
+ BUG_ON(len & L1_CACHE_MASK);
+ BUG_ON(src & L1_CACHE_MASK);
+ BUG_ON(dest & L1_CACHE_MASK);
+ BUG_ON(len > BTE_MAX_XFER);
/*
* Start with interface corresponding to cpu number
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