Re: [PATCH v2 0/6] perf parse-regs: Refactor architecture functions

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Wed, Aug 16, 2023 at 10:07:15AM +0800, Leo Yan escreveu:
> On Tue, Aug 15, 2023 at 03:57:17PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Aug 15, 2023 at 03:52:38PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Tue, Aug 15, 2023 at 03:45:27PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > > > Agreed, applied to perf-tools-next, sorry for the delay.
> > > > 
> > > > Had to add this to make 'perf test python' to work. Please run 'perf
> > > > test' before sending patches.
> > > 
> > > One more, please also do a 'make -C tools/perf build-test', with it I
> > > caught this:
> > > 
> > >          make_no_libunwind_O: cd . && make NO_LIBUNWIND=1 FEATURES_DUMP=/var/home/acme/git/perf-tools-next/tools/perf/BUILD_TEST_FEATURE_DUMP -j32 O=/tmp/tmp.yeEGyQq2HR DESTDIR=/tmp/tmp.ITgoO16jjH
> > > cd . && make NO_LIBUNWIND=1 FEATURES_DUMP=/var/home/acme/git/perf-tools-next/tools/perf/BUILD_TEST_FEATURE_DUMP -j32 O=/tmp/tmp.yeEGyQq2HR DESTDIR=/tmp/tmp.ITgoO16jjH
> > 
> > +#include "util/env.h"
> > 
> > As now we need it for perf_env__arch(ui->machine->env)
> 
> Sorry for inconvenience.
> 
> I saw this patch series has been picked into the branch:
> https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/log/?h=tmp.perf-tools-next
> 
> If want me to follow up, let me know.  Thank you!

Right, I'll fix this ones:

[perfbuilder@five ~]$ grep "unused variable" dm.log/*:*
dm.log/ubuntu:18.04-x-m68k:util/evsel.c:848:14: error: unused variable 'arch' [-Werror=unused-variable]
dm.log/ubuntu:18.04-x-riscv64:util/evsel.c:848:14: error: unused variable 'arch' [-Werror=unused-variable]
dm.log/ubuntu:18.04-x-sh4:util/evsel.c:848:14: error: unused variable 'arch' [-Werror=unused-variable]
dm.log/ubuntu:18.04-x-sparc64:util/evsel.c:848:14: error: unused variable 'arch' [-Werror=unused-variable]
[perfbuilder@five ~]$

And move that to perf-tools-next, we can go on from there.

The above is because we don't define CONFIG_PERF_REGS for these
architectures and thus that variable ends up not being used, so I'm
fixing up like below, in the cset where you made DWARF_MINIMAL_REGS
receive the arch parameter.

Also I haven't checked how gracefully we react when processing a
perf.data collected in one of those unsupported arches, can you please
check?

- Arnaldo

diff --git a/tools/perf/util/perf_regs.h b/tools/perf/util/perf_regs.h
index 790c1a26bbfe9b4b..de1673057e502de9 100644
--- a/tools/perf/util/perf_regs.h
+++ b/tools/perf/util/perf_regs.h
@@ -32,9 +32,6 @@ extern const struct sample_reg sample_reg_masks[];
 
 #include <perf_regs.h>
 
-#define DWARF_MINIMAL_REGS(arch)	\
-	((1ULL << perf_arch_reg_ip(arch)) | (1ULL << perf_arch_reg_sp(arch)))
-
 const char *perf_reg_name(int id, const char *arch);
 int perf_reg_value(u64 *valp, struct regs_dump *regs, int id);
 uint64_t perf_arch_reg_ip(const char *arch);
@@ -67,11 +64,19 @@ const char *__perf_reg_name_x86(int id);
 uint64_t __perf_reg_ip_x86(void);
 uint64_t __perf_reg_sp_x86(void);
 
+static inline uint64_t DWARF_MINIMAL_REGS(const char *arch)
+{
+	return (1ULL << perf_arch_reg_ip(arch)) | (1ULL << perf_arch_reg_sp(arch));
+}
+
 #else
 #define PERF_REGS_MASK	0
 #define PERF_REGS_MAX	0
 
-#define DWARF_MINIMAL_REGS(arch)	PERF_REGS_MASK
+static inline uint64_t DWARF_MINIMAL_REGS(const char *arch __maybe_unused)
+{
+	return PERF_REGS_MASK;
+}
 
 static inline const char *perf_reg_name(int id __maybe_unused, const char *arch __maybe_unused)
 {
 
> > >   CC      /tmp/tmp.yeEGyQq2HR/util/expr-flex.o
> > > util/unwind-libdw.c: In function ‘memory_read’:
> > > util/unwind-libdw.c:173:28: error: implicit declaration of function ‘perf_env__arch’ [-Werror=implicit-function-declaration]
> > >   173 |         const char *arch = perf_env__arch(ui->machine->env);
> > >       |                            ^~~~~~~~~~~~~~
> > > util/unwind-libdw.c:173:28: error: initialization of ‘const char *’ from ‘int’ makes pointer from integer without a cast [-Werror=int-conversion]
> > > util/unwind-libdw.c: In function ‘unwind__get_entries’:
> > > util/unwind-libdw.c:258:28: error: initialization of ‘const char *’ from ‘int’ makes pointer from integer without a cast [-Werror=int-conversion]
> > >   258 |         const char *arch = perf_env__arch(ui_buf.machine->env);
> > >       |                            ^~~~~~~~~~~~~~
> > > cc1: all warnings being treated as errors
> > > make[6]: *** [/var/home/acme/git/perf-tools-next/tools/build/Makefile.build:98: /tmp/tmp.yeEGyQq2HR/util/unwind-libdw.o] Error 1
> > > make[6]: *** Waiting for unfinished jobs....
> > > make[5]: *** [/var/home/acme/git/perf-tools-next/tools/build/Makefile.build:150: util] Error 2
> > > make[4]: *** [Makefile.perf:662: /tmp/tmp.yeEGyQq2HR/perf-in.o] Error 2
> > > make[4]: *** Waiting for unfinished jobs....
> > >   CC      /tmp/tmp.yeEGyQq2HR/pmu-events/pmu-events.o
> > >   LD      /tmp/tmp.yeEGyQq2HR/pmu-events/pmu-events-in.o
> > > make[3]: *** [Makefile.perf:238: sub-make] Error 2
> > > make[2]: *** [Makefile:70: all] Error 2
> > > make[1]: *** [tests/make:337: make_no_libunwind_O] Error 1
> > > make: *** [Makefile:103: build-test] Error 2
> > > make: Leaving directory '/var/home/acme/git/perf-tools-next/tools/perf'
> > > 
> > > real	1m29.784s
> > > user	10m41.597s
> > > sys	2m55.948s
> > > ⬢[acme@toolbox perf-tools-next]$
> > > 
> > > I'm trying to fix
> > 
> > -- 
> > 
> > - Arnaldo

-- 

- Arnaldo