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| author | Robin Holt <holt@sgi.com> | 2009-02-04 01:40:59 +0100 |
|---|---|---|
| committer | Tony Luck <aegl@agluck-desktop.(none)> | 2009-02-19 20:29:31 +0100 |
| commit | 39d481cba27809598e755e184bc0d8ae1d22423e (patch) | |
| tree | 15087a039ccdb05749e099e1a1a7ae39e3887a55 /arch/ia64 | |
| parent | [IA64] Build fix for __early_pfn_to_nid() undefined link error (diff) | |
| download | linux-39d481cba27809598e755e184bc0d8ae1d22423e.tar.xz linux-39d481cba27809598e755e184bc0d8ae1d22423e.zip | |
[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)>
Diffstat (limited to 'arch/ia64')
| -rw-r--r-- | arch/ia64/include/asm/sn/bte.h | 2 | ||||
| -rw-r--r-- | arch/ia64/sn/kernel/bte.c | 7 |
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 5efecf06c9a4..96798d2da7c2 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 9456d4034024..c6d6b62db66c 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 |