linux-kernel - [PATCH] perf TUI: Don't throw error for zero length symbols

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Message-Id: <1479804050-5028-1-git-send-email-ravi.bangoria@linux.vnet.ibm.com>
Date:   Tue, 22 Nov 2016 14:10:50 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
To:     anton@...ba.org, acme@...nel.org
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, chris.ryder@....com,
        mhiramat@...nel.org, linux-kernel@...r.kernel.org,
        mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        npiggin@...il.com, linuxppc-dev@...ts.ozlabs.orgp,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: [PATCH] perf TUI: Don't throw error for zero length symbols

perf report (with 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.

Link: https://lkml.org/lkml/2016/10/8/189

Reported-by: Anton Blanchard <anton@...ba.org>
Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.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 aeb5a44..430d039 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -593,7 +593,8 @@ 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;
-- 
1.8.3.1