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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-10-24 09:41:09 +0400
committerTony Luck <tony.luck@intel.com>2008-11-04 22:31:58 +0300
commitd8d54b0252280f519ad4f9268d2612b0463b3f9e (patch)
treeb18f26c6adfc2441b060091439a205603b008eff /arch/ia64/include/asm
parent6a2d26fd3fd1129824ffe53778832f0794d99cc2 (diff)
downloadlinux-d8d54b0252280f519ad4f9268d2612b0463b3f9e.tar.xz
[IA64] remove dead BIO_VMERGE_BOUNDARY definition
The block layer dropped the virtual merge feature (b8b3e16cfe6435d961f6aaebcfd52a1ff2a988c5). BIO_VMERGE_BOUNDARY definition is meaningless now (For IA64, BIO_VMERGE_BOUNDARY has been meaningless for a long time since IA64 disables the virtual merge feature). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/include/asm')
-rw-r--r--arch/ia64/include/asm/io.h24
1 files changed, 0 insertions, 24 deletions
diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
index 7f257507cd86..0d9d16e2d949 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -434,28 +434,4 @@ extern void memset_io(volatile void __iomem *s, int c, long n);
# endif /* __KERNEL__ */
-/*
- * Enabling BIO_VMERGE_BOUNDARY forces us to turn off I/O MMU bypassing. It is said that
- * BIO-level virtual merging can give up to 4% performance boost (not verified for ia64).
- * On the other hand, we know that I/O MMU bypassing gives ~8% performance improvement on
- * SPECweb-like workloads on zx1-based machines. Thus, for now we favor I/O MMU bypassing
- * over BIO-level virtual merging.
- */
-extern unsigned long ia64_max_iommu_merge_mask;
-#if 1
-#define BIO_VMERGE_BOUNDARY 0
-#else
-/*
- * It makes no sense at all to have this BIO_VMERGE_BOUNDARY macro here. Should be
- * replaced by dma_merge_mask() or something of that sort. Note: the only way
- * BIO_VMERGE_BOUNDARY is used is to mask off bits. Effectively, our definition gets
- * expanded into:
- *
- * addr & ((ia64_max_iommu_merge_mask + 1) - 1) == (addr & ia64_max_iommu_vmerge_mask)
- *
- * which is precisely what we want.
- */
-#define BIO_VMERGE_BOUNDARY (ia64_max_iommu_merge_mask + 1)
-#endif
-
#endif /* _ASM_IA64_IO_H */