4.20-stable review patch. If anyone has any objections, please let me know.
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From: Adrian Hunter adrian.hunter@intel.com
commit ec1891afae740be581ecf5abc8bda74c4549203f upstream.
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 adrian.hunter@intel.com Cc: Andi Kleen ak@linux.intel.com Cc: David S. Miller davem@davemloft.net Cc: Jiri Olsa jolsa@redhat.com Cc: Leo Yan leo.yan@linaro.org Cc: Mathieu Poirier mathieu.poirier@linaro.org 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 acme@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- tools/perf/arch/common.c | 10 ++++++++++ tools/perf/arch/common.h | 1 + tools/perf/util/machine.h | 1 + tools/perf/util/session.c | 4 ++++ 4 files changed, 16 insertions(+)
--- a/tools/perf/arch/common.c +++ b/tools/perf/arch/common.c @@ -200,3 +200,13 @@ int perf_env__lookup_objdump(struct perf
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"); +} --- a/tools/perf/arch/common.h +++ b/tools/perf/arch/common.h @@ -5,5 +5,6 @@ #include "../util/env.h"
int perf_env__lookup_objdump(struct perf_env *env, const char **path); +bool perf_env__single_address_space(struct perf_env *env);
#endif /* ARCH_PERF_COMMON_H */ --- a/tools/perf/util/machine.h +++ b/tools/perf/util/machine.h @@ -42,6 +42,7 @@ struct machine { u16 id_hdr_size; bool comm_exec; bool kptr_restrict_warned; + bool single_address_space; char *root_dir; char *mmap_name; struct threads threads[THREADS__TABLE_SIZE]; --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -24,6 +24,7 @@ #include "thread.h" #include "thread-stack.h" #include "stat.h" +#include "arch/common.h"
static int perf_session__deliver_event(struct perf_session *session, union perf_event *event, @@ -150,6 +151,9 @@ struct perf_session *perf_session__new(s session->machines.host.env = &perf_env; }
+ session->machines.host.single_address_space = + perf_env__single_address_space(session->machines.host.env); + if (!data || perf_data__is_write(data)) { /* * In O_RDONLY mode this will be performed when reading the