From ec1891afae740be581ecf5abc8bda74c4549203f Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Tue, 6 Nov 2018 23:07:10 +0200 Subject: perf machine: Record if a arch has a single user/kernel address space Some architectures have a single address space for kernel and user addresses, which makes it possible to determine if an address is in kernel space or user space. Some don't, e.g.: sparc. Cache that info in perf_env so that, for instance, code needing to fallback failed symbol lookups at the kernel space in single address space arches can lookup at userspace. Signed-off-by: Adrian Hunter Cc: Andi Kleen Cc: David S. Miller Cc: Jiri Olsa Cc: Leo Yan Cc: Mathieu Poirier Cc: stable@vger.kernel.org # 4.19 Link: http://lkml.kernel.org/r/20181106210712.12098-2-adrian.hunter@intel.com [ split from a larger patch ] Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/arch/common.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'tools/perf/arch/common.c') diff --git a/tools/perf/arch/common.c b/tools/perf/arch/common.c index 82657c01a3b8..5f69fd0b745a 100644 --- a/tools/perf/arch/common.c +++ b/tools/perf/arch/common.c @@ -200,3 +200,13 @@ int perf_env__lookup_objdump(struct perf_env *env, const char **path) return perf_env__lookup_binutils_path(env, "objdump", path); } + +/* + * Some architectures have a single address space for kernel and user addresses, + * which makes it possible to determine if an address is in kernel space or user + * space. + */ +bool perf_env__single_address_space(struct perf_env *env) +{ + return strcmp(perf_env__arch(env), "sparc"); +} -- cgit v1.2.3-55-g7522