[PATCH 23/29] perf annotate: Don't throw error for zero length symbols

[Arnaldo Carvalho de Melo]

From: Ravi Bangoria <ravi.bangoria at linux.vnet.ibm.com>

'perf report --tui' exits with error when it finds a sample of zero
length symbol (i.e. addr == sym->start == sym->end). Actually these are
valid samples. Don't exit TUI and show report with such symbols.

Reported-and-Tested-by: Anton Blanchard <anton at samba.org>
Link: https://lkml.org/lkml/2016/10/8/189
Signed-off-by: Ravi Bangoria <ravi.bangoria at linux.vnet.ibm.com>
Cc: Alexander Shishkin <alexander.shishkin at linux.intel.com>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Chris Riyder <chris.ryder at arm.com>
Cc: linuxppc-dev at lists.ozlabs.org
Cc: Masami Hiramatsu <mhiramat at kernel.org>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Nicholas Piggin <npiggin at gmail.com>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: stable at kernel.org # v4.9+
Link: http://lkml.kernel.org/r/1479804050-5028-1-git-send-email-ravi.bangoria@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme at redhat.com>
---
 tools/perf/util/annotate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index c81a3950a7fe..06cc04e5806a 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -647,7 +647,8 @@ static int __symbol__inc_addr_samples(struct symbol *sym, struct map *map,
 
 	pr_debug3("%s: addr=%#" PRIx64 "\n", __func__, map->unmap_ip(map, addr));
 
-	if (addr < sym->start || addr >= sym->end) {
+	if ((addr < sym->start || addr >= sym->end) &&
+	    (addr != sym->end || sym->start != sym->end)) {
 		pr_debug("%s(%d): ERANGE! sym->name=%s, start=%#" PRIx64 ", addr=%#" PRIx64 ", end=%#" PRIx64 "\n",
 		       __func__, __LINE__, sym->name, sym->start, addr, sym->end);
 		return -ERANGE;
-- 
2.9.3