Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf updates from Ingo Molnar:
 "Lots of tooling updates - too many to list, here's a few highlights:

   - Various subcommand updates to 'perf trace', 'perf report', 'perf
     record', 'perf annotate', 'perf script', 'perf test', etc.

   - CPU and NUMA topology and affinity handling improvements,

   - HW tracing and HW support updates:
      - Intel PT updates
      - ARM CoreSight updates
      - vendor HW event updates

   - BPF updates

   - Tons of infrastructure updates, both on the build system and the
     library support side

   - Documentation updates.

   - ... and lots of other changes, see the changelog for details.

  Kernel side updates:

   - Tighten up kprobes blacklist handling, reduce the number of places
     where developers can install a kprobe and hang/crash the system.

   - Fix/enhance vma address filter handling.

   - Various PMU driver updates, small fixes and additions.

   - refcount_t conversions

   - BPF updates

   - error code propagation enhancements

   - misc other changes"

* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (238 commits)
  perf script python: Add Python3 support to syscall-counts-by-pid.py
  perf script python: Add Python3 support to syscall-counts.py
  perf script python: Add Python3 support to stat-cpi.py
  perf script python: Add Python3 support to stackcollapse.py
  perf script python: Add Python3 support to sctop.py
  perf script python: Add Python3 support to powerpc-hcalls.py
  perf script python: Add Python3 support to net_dropmonitor.py
  perf script python: Add Python3 support to mem-phys-addr.py
  perf script python: Add Python3 support to failed-syscalls-by-pid.py
  perf script python: Add Python3 support to netdev-times.py
  perf tools: Add perf_exe() helper to find perf binary
  perf script: Handle missing fields with -F +..
  perf data: Add perf_data__open_dir_data function
  perf data: Add perf_data__(create_dir|close_dir) functions
  perf data: Fail check_backup in case of error
  perf data: Make check_backup work over directories
  perf tools: Add rm_rf_perf_data function
  perf tools: Add pattern name checking to rm_rf
  perf tools: Add depth checking to rm_rf
  perf data: Add global path holder
  ...

1 files changed, 35 insertions, 4 deletions

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index 4503f3ca45ab..6e03db142091 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -26,6 +26,7 @@
 
 #include "../cache.h"
 #include "../util.h"
+#include "../auxtrace.h"
 
 #include "intel-pt-insn-decoder.h"
 #include "intel-pt-pkt-decoder.h"
@@ -867,7 +868,7 @@ static int intel_pt_get_next_packet(struct intel_pt_decoder *decoder)
 
                 ret = intel_pt_get_packet(decoder->buf, decoder->len,
                                           &decoder->packet);
-                if (ret == INTEL_PT_NEED_MORE_BYTES &&
+                if (ret == INTEL_PT_NEED_MORE_BYTES && BITS_PER_LONG == 32 &&
                     decoder->len < INTEL_PT_PKT_MAX_SZ && !decoder->next_buf) {
                         ret = intel_pt_get_split_packet(decoder);
                         if (ret < 0)
@@ -1394,7 +1395,6 @@ static int intel_pt_overflow(struct intel_pt_decoder *decoder)
 {
         intel_pt_log("ERROR: Buffer overflow\n");
         intel_pt_clear_tx_flags(decoder);
-        decoder->cbr = 0;
         decoder->timestamp_insn_cnt = 0;
         decoder->pkt_state = INTEL_PT_STATE_ERR_RESYNC;
         decoder->overflow = true;
@@ -2575,6 +2575,34 @@ static int intel_pt_tsc_cmp(uint64_t tsc1, uint64_t tsc2)
         }
 }
 
+#define MAX_PADDING (PERF_AUXTRACE_RECORD_ALIGNMENT - 1)
+
+/**
+ * adj_for_padding - adjust overlap to account for padding.
+ * @buf_b: second buffer
+ * @buf_a: first buffer
+ * @len_a: size of first buffer
+ *
+ * @buf_a might have up to 7 bytes of padding appended. Adjust the overlap
+ * accordingly.
+ *
+ * Return: A pointer into @buf_b from where non-overlapped data starts
+ */
+static unsigned char *adj_for_padding(unsigned char *buf_b,
+                                      unsigned char *buf_a, size_t len_a)
+{
+        unsigned char *p = buf_b - MAX_PADDING;
+        unsigned char *q = buf_a + len_a - MAX_PADDING;
+        int i;
+
+        for (i = MAX_PADDING; i; i--, p++, q++) {
+                if (*p != *q)
+                        break;
+        }
+
+        return p;
+}
+
 /**
  * intel_pt_find_overlap_tsc - determine start of non-overlapped trace data
  *                             using TSC.
@@ -2625,8 +2653,11 @@ static unsigned char *intel_pt_find_overlap_tsc(unsigned char *buf_a,
 
                         /* Same TSC, so buffers are consecutive */
                         if (!cmp && rem_b >= rem_a) {
+                                unsigned char *start;
+
                                 *consecutive = true;
-                                return buf_b + len_b - (rem_b - rem_a);
+                                start = buf_b + len_b - (rem_b - rem_a);
+                                return adj_for_padding(start, buf_a, len_a);
                         }
                         if (cmp < 0)
                                 return buf_b; /* tsc_a < tsc_b => no overlap */
@@ -2689,7 +2720,7 @@ unsigned char *intel_pt_find_overlap(unsigned char *buf_a, size_t len_a,
                 found = memmem(buf_a, len_a, buf_b, len_a);
                 if (found) {
                         *consecutive = true;
-                        return buf_b + len_a;
+                        return adj_for_padding(buf_b + len_a, buf_a, len_a);
                 }
 
                 /* Try again at next PSB in buffer 'a' */