1 files changed, 85 insertions, 0 deletions

diff --git a/meta/recipes-kernel/lttng/lttng-ust-0.11/remove_ppc_specific_time_reading_function.patch b/meta/recipes-kernel/lttng/lttng-ust-0.11/remove_ppc_specific_time_reading_function.patch
new file mode 100644
index 0000000000..c5487fd916
--- /dev/null
+++ b/meta/recipes-kernel/lttng/lttng-ust-0.11/remove_ppc_specific_time_reading_function.patch
@@ -0,0 +1,85 @@
+Dexuan Cui <dexuan.cui@intel.com>: I got the following patch from lttng dev
+mailing list:
+http://lists.casi.polymtl.ca/pipermail/ltt-dev/2011-February/003903.html
+The patch looks good and I think it would be in next release. At present,
+let's add it into SRC_URI.
+
+-----------------------------------------------------------------
+The PPC version of the trace_clock_read64 was using the TB register
+which is not constant accross implementations. The currently
+measured time base on PPC was not accurate.
+So, for now, we rely on the CLOCK_MONOTONIC.
+
+This patch remove a bunch of #ifdef for x86 and PPC, since we now rely on
+the same base clock. It also fix the build on PPC that was currently broken
+
+Signed-off-by: Yannick Brosseau <yannick.brosseau@gmail.com>
+-----------------------------------------------------------------
+
+--- a/include/ust/clock.h
++++ b/include/ust/clock.h
+@@ -39,7 +39,6 @@
+    precision and monotonicity.
+ */
+ 
+-#if __i386__ || __x86_64__
+ /* Only available for x86 arch */
+ #define CLOCK_TRACE_FREQ  14
+ #define CLOCK_TRACE  15
+@@ -47,36 +46,10 @@
+        struct timespec ts;
+        u64 lttng_ts;
+ };
+-#endif /* __i386__ || __x86_64__ */
+ 
+ extern int ust_clock_source;
+ 
+ /* Choosing correct trace clock */
+-#if __PPC__
+-static __inline__ u64 trace_clock_read64(void)
+-{
+-       unsigned long tb_l;
+-       unsigned long tb_h;
+-       unsigned long tb_h2;
+-       u64 tb;
+-
+-       __asm__ (
+-               "1:\n\t"
+-               "mftbu %[rhigh]\n\t"
+-               "mftb %[rlow]\n\t"
+-               "mftbu %[rhigh2]\n\t"
+-               "cmpw %[rhigh],%[rhigh2]\n\t"
+-               "bne 1b\n\t"
+-               : [rhigh] "=r" (tb_h), [rhigh2] "=r" (tb_h2), [rlow] "=r" (tb_l));
+-
+-       tb = tb_h;
+-       tb <<= 32;
+-       tb |= tb_l;
+-
+-       return tb;
+-}
+-
+-#else  /* !__PPC__ */
+ 
+ static __inline__ u64 trace_clock_read64(void)
+ {
+@@ -101,17 +74,17 @@
+        return retval;
+ }
+ 
+-#endif /* __PPC__ */
+-
+ static __inline__ u64 trace_clock_frequency(void)
+ {
+        struct timespec ts;
+        union lttng_timespec *lts = (union lttng_timespec *) &ts;
+ 
++#if __i386__ || __x86_64__
+        if (likely(ust_clock_source == CLOCK_TRACE)) {
+                clock_gettime(CLOCK_TRACE_FREQ, &ts);
+                return lts->lttng_ts;
+        }
++#endif
+        return 1000000000LL;
+ }
+