vserver 1.9.5.x5

[linux-2.6.git] / include / linux / bio.h

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 2585402..cd8d47b 100644 (file)
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -188,8 +188,15 @@ struct bio {
 
 #define __BVEC_END(bio)                bio_iovec_idx((bio), (bio)->bi_vcnt - 1)
 #define __BVEC_START(bio)      bio_iovec_idx((bio), (bio)->bi_idx)
+
+/*
+ * allow arch override, for eg virtualized architectures (put in asm/io.h)
+ */
+#ifndef BIOVEC_PHYS_MERGEABLE
 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2)      \
        ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
+#endif
+
 #define BIOVEC_VIRT_MERGEABLE(vec1, vec2)      \
        ((((bvec_to_phys((vec1)) + (vec1)->bv_len) | bvec_to_phys((vec2))) & (BIO_VMERGE_BOUNDARY - 1)) == 0)
 #define __BIO_SEG_BOUNDARY(addr1, addr2, mask) \