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Fix kernel unaligned access on sparc64

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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 <behlendorf1@llnl.gov>
Closes #7642
Closes #7684
This commit is contained in:
Brian Behlendorf
2018-07-11 13:10:40 -07:00
committed by Tony Hutter
parent 9daae583d8
commit 716ce2b89e
3 changed files with 28 additions and 16 deletions
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lib/libspl/include/sys/isa_defs.h
+7
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@@ -55,6 +55,7 @@ extern "C" {
#endif
#define _SUNOS_VTOC_16
#define HAVE_EFFICIENT_UNALIGNED_ACCESS
/* i386 arch specific defines */
#elif defined(__i386) || defined(__i386__)
@@ -76,6 +77,7 @@ extern "C" {
#endif
#define _SUNOS_VTOC_16
#define HAVE_EFFICIENT_UNALIGNED_ACCESS
/* powerpc arch specific defines */
#elif defined(__powerpc) || defined(__powerpc__) || defined(__powerpc64__)
@@ -99,6 +101,7 @@ extern "C" {
#endif
#define _SUNOS_VTOC_16
#define HAVE_EFFICIENT_UNALIGNED_ACCESS
/* arm arch specific defines */
#elif defined(__arm) || defined(__arm__) || defined(__aarch64__)
@@ -129,6 +132,10 @@ extern "C" {
#define _SUNOS_VTOC_16
#if defined(__ARM_FEATURE_UNALIGNED)
#define HAVE_EFFICIENT_UNALIGNED_ACCESS
#endif
/* sparc arch specific defines */
#elif defined(__sparc) || defined(__sparc__)