diff options
Diffstat (limited to 'tools/perf/builtin-record.c')
| -rw-r--r-- | tools/perf/builtin-record.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 0974f957b8fa..2ca107f3efdf 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -823,6 +823,19 @@ int cmd_record(int argc, const char **argv, const char *prefix __used) symbol__init(); + if (symbol_conf.kptr_restrict) + pr_warning("WARNING: Kernel address maps " + "(/proc/{kallsyms,modules}) are restricted, " + "check /proc/sys/kernel/kptr_restrict.\n\n" + "Samples in kernel functions may not be resolved " + "if a suitable vmlinux file is not found in the " + "buildid cache or in the vmlinux path.\n\n" + "Samples in kernel modules won't be resolved " + "at all.\n\n" + "If some relocation was applied (e.g. kexec) " + "symbols may be misresolved even with a suitable " + "vmlinux or kallsyms file.\n\n"); + if (no_buildid_cache || no_buildid) disable_buildid_cache(); |