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perf tools: Use the "_stest" symbol to identify the kernel map when loading kcore 

The first symbol is not necessarily in the kernel text.  Instead of
using the first symbol, use the _stest symbol to identify the kernel map
when loading kcore.

This allows for the introduction of symbols to identify the x86_64 PTI
entry trampolines.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/1525866228-30321-6-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2018-05-09 14:43:34 +03:00 committed by Arnaldo Carvalho de Melo
parent d8fc764d0b
commit 5654997838
1 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
tools/perf/util/symbol.c
View File

@ -1149,7 +1149,7 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
bool is_64_bit;
int err, fd;
char kcore_filename[PATH_MAX];
struct symbol *sym;
u64 stext;
if (!kmaps)
return -EINVAL;
@ -1198,13 +1198,13 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
old_map = next;
}
/* Find the kernel map using the first symbol */
sym = dso__first_symbol(dso);
list_for_each_entry(new_map, &md.maps, node) {
if (sym && sym->start >= new_map->start &&
sym->start < new_map->end) {
replacement_map = new_map;
break;
/* Find the kernel map using the '_stext' symbol */
if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
list_for_each_entry(new_map, &md.maps, node) {
if (stext >= new_map->start && stext < new_map->end) {
replacement_map = new_map;
break;
}
}
}