diff options
Diffstat (limited to 'meta/recipes-kernel/lttng/lttng-ust-0.11/remove_ppc_specific_time_reading_function.patch')
| -rw-r--r-- | meta/recipes-kernel/lttng/lttng-ust-0.11/remove_ppc_specific_time_reading_function.patch | 85 |
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; + } + |