linux-kernel - [PATCH] perf tools: set kernel end address properly

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Date:   Mon, 16 Apr 2018 13:22:40 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@....com,
        Kim Phillips <kim.phillips@....com>
Subject: [PATCH] perf tools: set kernel end address properly

The map_groups__fixup_end() was called to set end addresses of kernel
map and module maps.  But now machine__create_modules() is set the end
address of modules properly so the only remaining piece is the kernel
map.  We can set it with adjacent module's address directly instead of
calling the map_groups__fixup_end().  If there's no module after the
kernel map, the end address will be ~0ULL.

Reported-by: Kim Phillips <kim.phillips@....com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/machine.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 2eca8478e24f..be328416de61 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1019,13 +1019,6 @@ int machine__load_vmlinux_path(struct machine *machine, enum map_type type)
 	return ret;
 }
 
-static void map_groups__fixup_end(struct map_groups *mg)
-{
-	int i;
-	for (i = 0; i < MAP__NR_TYPES; ++i)
-		__map_groups__fixup_end(mg, i);
-}
-
 static char *get_kernel_version(const char *root_dir)
 {
 	char version[PATH_MAX];
@@ -1233,7 +1226,9 @@ int machine__create_kernel_maps(struct machine *machine)
 {
 	struct dso *kernel = machine__get_kernel(machine);
 	const char *name = NULL;
+	struct map *map;
 	u64 addr = 0;
+	u64 end = ~0ULL;
 	int ret;
 
 	if (kernel == NULL)
@@ -1259,13 +1254,14 @@ int machine__create_kernel_maps(struct machine *machine)
 			machine__destroy_kernel_maps(machine);
 			return -1;
 		}
-		machine__set_kernel_mmap(machine, addr, 0);
 	}
 
-	/*
-	 * Now that we have all the maps created, just set the ->end of them:
-	 */
-	map_groups__fixup_end(&machine->kmaps);
+	/* update end address of the kernel map using adjacent module address */
+	map = map__next(machine__kernel_map(machine));
+	if (map)
+		end = map->start;
+
+	machine__set_kernel_mmap(machine, addr, end);
 	return 0;
 }
 
-- 
2.16.2