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authorBrian Behlendorf <[email protected]>2018-07-11 13:10:40 -0700
committerGitHub <[email protected]>2018-07-11 13:10:40 -0700
commit33a19e0fd9b22364d295351ea1bda57b80e39e85 (patch)
tree1a0bf9708376d1a00e64dd5f8e23eb3bbcb739b9 /include
parent2dca37d8dc13e6faf92c5a095d49dffd480c5b2d (diff)
Fix kernel unaligned access on sparc64
Update the SA_COPY_DATA macro to check if architecture supports efficient unaligned memory accesses at compile time. Otherwise fallback to using the sa_copy_data() function. The kernel provided CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is used to determine availability in kernel space. In user space the x86_64, x86, powerpc, and sometimes arm architectures will define the HAVE_EFFICIENT_UNALIGNED_ACCESS macro. Signed-off-by: Brian Behlendorf <[email protected]> Closes #7642 Closes #7684
Diffstat (limited to 'include')
-rw-r--r--include/spl/sys/isa_defs.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/spl/sys/isa_defs.h b/include/spl/sys/isa_defs.h
index 089ae0f85..1eb400277 100644
--- a/include/spl/sys/isa_defs.h
+++ b/include/spl/sys/isa_defs.h
@@ -210,6 +210,14 @@
#include <sys/byteorder.h>
+/*
+ * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS will be defined by the Linux
+ * kernel for architectures which support efficient unaligned access.
+ */
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
+#define HAVE_EFFICIENT_UNALIGNED_ACCESS
+#endif
+
#if defined(__LITTLE_ENDIAN) && !defined(_LITTLE_ENDIAN)
#define _LITTLE_ENDIAN __LITTLE_ENDIAN
#endif