From nobody Tue Dec 30 13:23:35 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2939BC072A2 for ; Wed, 15 Nov 2023 19:33:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234301AbjKOTd7 (ORCPT ); Wed, 15 Nov 2023 14:33:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50816 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234263AbjKOTdw (ORCPT ); Wed, 15 Nov 2023 14:33:52 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 585FC1B6; Wed, 15 Nov 2023 11:33:46 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E9226C433C7; Wed, 15 Nov 2023 19:33:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1700076826; bh=C9d7m2stdHGAuOhCF7kDVySq8E4Kx449Rr4h5fAi4Tg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oeSDY/DDUcgWFLOgfksulyUFBnN5f2Jm0ZjxIHc+ACf3RSr6kAWiRGMRJS5wRka5W ZTDxiHwLly+8BRa82k2QklzK2UgMyPTc4LtNUHZDfFRYKRIgNDpN+NZNvJW5/I+arx WZbKX3LiAZ13Km+3rtq+di3bHmflpahsnScEHM1k= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ian Rogers , K Prateek Nayak , Ravi Bangoria , James Clark , Mark Rutland , Suzuki Poulouse , Sean Christopherson , Wei Li , Peter Zijlstra , Adrian Hunter , Arnaldo Carvalho de Melo , Huacai Chen , Jiri Olsa , Namhyung Kim , Will Deacon , Leo Yan , Mike Leach , Kajol Jain , Alexander Shishkin , Kan Liang , Athira Rajeev , linux-arm-kernel@lists.infradead.org, Ming Wang , John Garry , Ingo Molnar , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH 6.5 426/550] perf pmu: Remove logic for PMU name being NULL Date: Wed, 15 Nov 2023 14:16:50 -0500 Message-ID: <20231115191630.292521239@linuxfoundation.org> X-Mailer: git-send-email 2.42.1 In-Reply-To: <20231115191600.708733204@linuxfoundation.org> References: <20231115191600.708733204@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 6.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ian Rogers [ Upstream commit c091ee90897aacf60aee510464cfc28b4041186f ] The PMU name could be NULL in the case of the fake_pmu. Initialize the name for the fake_pmu to "fake" so that all other logic can assume it is initialized. Add a const to the type of name so that a literal can be used to avoid additional initialization code. Propagate the cost through related routines and remove now unnecessary "(char *)" casts. Doing this located a bug in builtin-list for the pmu_glob that was missing a strdup. Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20230825024002.801955-3-irogers@google.com Cc: K Prateek Nayak Cc: Ravi Bangoria Cc: James Clark Cc: Mark Rutland Cc: Suzuki Poulouse Cc: Sean Christopherson Cc: Wei Li Cc: Peter Zijlstra Cc: Adrian Hunter Cc: Arnaldo Carvalho de Melo Cc: Huacai Chen Cc: Jiri Olsa Cc: Namhyung Kim Cc: Will Deacon Cc: Leo Yan Cc: Mike Leach Cc: Kajol Jain Cc: Alexander Shishkin Cc: Kan Liang Cc: Athira Rajeev Cc: linux-arm-kernel@lists.infradead.org Cc: Ming Wang Cc: John Garry Cc: Ingo Molnar Cc: linux-kernel@vger.kernel.org Cc: linux-perf-users@vger.kernel.org Signed-off-by: Arnaldo Carvalho de Melo Stable-dep-of: 85f73c377b2a ("perf mem-events: Avoid uninitialized read") Signed-off-by: Sasha Levin --- tools/perf/arch/arm64/util/mem-events.c | 2 +- tools/perf/arch/powerpc/util/mem-events.c | 6 +++--- tools/perf/arch/x86/util/mem-events.c | 8 ++++---- tools/perf/arch/x86/util/pmu.c | 10 +++++----- tools/perf/builtin-list.c | 2 +- tools/perf/tests/pmu-events.c | 16 ++++++++-------- tools/perf/util/env.c | 8 ++------ tools/perf/util/header.c | 8 +------- tools/perf/util/mem-events.c | 16 ++++++++-------- tools/perf/util/mem-events.h | 2 +- tools/perf/util/parse-events.c | 7 ++----- tools/perf/util/parse-events.h | 2 +- tools/perf/util/parse-events.y | 2 +- tools/perf/util/pmu.c | 16 +++++++++------- tools/perf/util/pmu.h | 8 ++++---- 15 files changed, 51 insertions(+), 62 deletions(-) diff --git a/tools/perf/arch/arm64/util/mem-events.c b/tools/perf/arch/arm6= 4/util/mem-events.c index df817d1f9f3eb..3bcc5c7035c21 100644 --- a/tools/perf/arch/arm64/util/mem-events.c +++ b/tools/perf/arch/arm64/util/mem-events.c @@ -20,7 +20,7 @@ struct perf_mem_event *perf_mem_events__ptr(int i) return &perf_mem_events[i]; } =20 -char *perf_mem_events__name(int i, char *pmu_name __maybe_unused) +const char *perf_mem_events__name(int i, const char *pmu_name __maybe_unus= ed) { struct perf_mem_event *e =3D perf_mem_events__ptr(i); =20 diff --git a/tools/perf/arch/powerpc/util/mem-events.c b/tools/perf/arch/po= werpc/util/mem-events.c index 4120fafe0be41..78b986e5268d9 100644 --- a/tools/perf/arch/powerpc/util/mem-events.c +++ b/tools/perf/arch/powerpc/util/mem-events.c @@ -3,10 +3,10 @@ #include "mem-events.h" =20 /* PowerPC does not support 'ldlat' parameter. */ -char *perf_mem_events__name(int i, char *pmu_name __maybe_unused) +const char *perf_mem_events__name(int i, const char *pmu_name __maybe_unus= ed) { if (i =3D=3D PERF_MEM_EVENTS__LOAD) - return (char *) "cpu/mem-loads/"; + return "cpu/mem-loads/"; =20 - return (char *) "cpu/mem-stores/"; + return "cpu/mem-stores/"; } diff --git a/tools/perf/arch/x86/util/mem-events.c b/tools/perf/arch/x86/ut= il/mem-events.c index a8a782bcb1213..191b372f9a2d3 100644 --- a/tools/perf/arch/x86/util/mem-events.c +++ b/tools/perf/arch/x86/util/mem-events.c @@ -52,7 +52,7 @@ bool is_mem_loads_aux_event(struct evsel *leader) return leader->core.attr.config =3D=3D MEM_LOADS_AUX; } =20 -char *perf_mem_events__name(int i, char *pmu_name) +const char *perf_mem_events__name(int i, const char *pmu_name) { struct perf_mem_event *e =3D perf_mem_events__ptr(i); =20 @@ -65,7 +65,7 @@ char *perf_mem_events__name(int i, char *pmu_name) =20 if (!pmu_name) { mem_loads_name__init =3D true; - pmu_name =3D (char *)"cpu"; + pmu_name =3D "cpu"; } =20 if (perf_pmus__have_event(pmu_name, "mem-loads-aux")) { @@ -82,12 +82,12 @@ char *perf_mem_events__name(int i, char *pmu_name) =20 if (i =3D=3D PERF_MEM_EVENTS__STORE) { if (!pmu_name) - pmu_name =3D (char *)"cpu"; + pmu_name =3D "cpu"; =20 scnprintf(mem_stores_name, sizeof(mem_stores_name), e->name, pmu_name); return mem_stores_name; } =20 - return (char *)e->name; + return e->name; } diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c index 65d8cdff4d5f4..f428cffb03781 100644 --- a/tools/perf/arch/x86/util/pmu.c +++ b/tools/perf/arch/x86/util/pmu.c @@ -126,7 +126,7 @@ static int setup_pmu_alias_list(void) return ret; } =20 -static char *__pmu_find_real_name(const char *name) +static const char *__pmu_find_real_name(const char *name) { struct pmu_alias *pmu_alias; =20 @@ -135,10 +135,10 @@ static char *__pmu_find_real_name(const char *name) return pmu_alias->name; } =20 - return (char *)name; + return name; } =20 -char *pmu_find_real_name(const char *name) +const char *pmu_find_real_name(const char *name) { if (cached_list) return __pmu_find_real_name(name); @@ -149,7 +149,7 @@ char *pmu_find_real_name(const char *name) return __pmu_find_real_name(name); } =20 -static char *__pmu_find_alias_name(const char *name) +static const char *__pmu_find_alias_name(const char *name) { struct pmu_alias *pmu_alias; =20 @@ -160,7 +160,7 @@ static char *__pmu_find_alias_name(const char *name) return NULL; } =20 -char *pmu_find_alias_name(const char *name) +const char *pmu_find_alias_name(const char *name) { if (cached_list) return __pmu_find_alias_name(name); diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c index 7fec2cca759f6..e74d0223deb7f 100644 --- a/tools/perf/builtin-list.c +++ b/tools/perf/builtin-list.c @@ -502,7 +502,7 @@ int cmd_list(int argc, const char **argv) ret =3D -1; goto out; } - default_ps.pmu_glob =3D pmu->name; + default_ps.pmu_glob =3D strdup(pmu->name); } } print_cb.print_start(ps); diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c index 64383fc34ef1b..5c6f930db4387 100644 --- a/tools/perf/tests/pmu-events.c +++ b/tools/perf/tests/pmu-events.c @@ -508,7 +508,7 @@ static struct perf_pmu_alias *find_alias(const char *te= st_event, struct list_hea } =20 /* Verify aliases are as expected */ -static int __test_core_pmu_event_aliases(char *pmu_name, int *count) +static int __test_core_pmu_event_aliases(const char *pmu_name, int *count) { struct perf_pmu_test_event const **test_event_table; struct perf_pmu *pmu; @@ -635,7 +635,7 @@ static int __test_uncore_pmu_event_aliases(struct perf_= pmu_test_pmu *test_pmu) static struct perf_pmu_test_pmu test_pmus[] =3D { { .pmu =3D { - .name =3D (char *)"hisi_sccl1_ddrc2", + .name =3D "hisi_sccl1_ddrc2", .is_uncore =3D 1, }, .aliases =3D { @@ -644,7 +644,7 @@ static struct perf_pmu_test_pmu test_pmus[] =3D { }, { .pmu =3D { - .name =3D (char *)"uncore_cbox_0", + .name =3D "uncore_cbox_0", .is_uncore =3D 1, }, .aliases =3D { @@ -655,7 +655,7 @@ static struct perf_pmu_test_pmu test_pmus[] =3D { }, { .pmu =3D { - .name =3D (char *)"hisi_sccl3_l3c7", + .name =3D "hisi_sccl3_l3c7", .is_uncore =3D 1, }, .aliases =3D { @@ -664,7 +664,7 @@ static struct perf_pmu_test_pmu test_pmus[] =3D { }, { .pmu =3D { - .name =3D (char *)"uncore_imc_free_running_0", + .name =3D "uncore_imc_free_running_0", .is_uncore =3D 1, }, .aliases =3D { @@ -673,7 +673,7 @@ static struct perf_pmu_test_pmu test_pmus[] =3D { }, { .pmu =3D { - .name =3D (char *)"uncore_imc_0", + .name =3D "uncore_imc_0", .is_uncore =3D 1, }, .aliases =3D { @@ -682,7 +682,7 @@ static struct perf_pmu_test_pmu test_pmus[] =3D { }, { .pmu =3D { - .name =3D (char *)"uncore_sys_ddr_pmu0", + .name =3D "uncore_sys_ddr_pmu0", .is_uncore =3D 1, .id =3D (char *)"v8", }, @@ -692,7 +692,7 @@ static struct perf_pmu_test_pmu test_pmus[] =3D { }, { .pmu =3D { - .name =3D (char *)"uncore_sys_ccn_pmu4", + .name =3D "uncore_sys_ccn_pmu4", .is_uncore =3D 1, .id =3D (char *)"0x01", }, diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c index 9eabf3ec56e97..a164164001fb5 100644 --- a/tools/perf/util/env.c +++ b/tools/perf/util/env.c @@ -324,11 +324,9 @@ int perf_env__read_pmu_mappings(struct perf_env *env) u32 pmu_num =3D 0; struct strbuf sb; =20 - while ((pmu =3D perf_pmus__scan(pmu))) { - if (!pmu->name) - continue; + while ((pmu =3D perf_pmus__scan(pmu))) pmu_num++; - } + if (!pmu_num) { pr_debug("pmu mappings not available\n"); return -ENOENT; @@ -339,8 +337,6 @@ int perf_env__read_pmu_mappings(struct perf_env *env) return -ENOMEM; =20 while ((pmu =3D perf_pmus__scan(pmu))) { - if (!pmu->name) - continue; if (strbuf_addf(&sb, "%u:%s", pmu->type, pmu->name) < 0) goto error; /* include a NULL character at the end */ diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 7af85a479786b..083919e3b8d88 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -746,20 +746,14 @@ static int write_pmu_mappings(struct feat_fd *ff, * Do a first pass to count number of pmu to avoid lseek so this * works in pipe mode as well. */ - while ((pmu =3D perf_pmus__scan(pmu))) { - if (!pmu->name) - continue; + while ((pmu =3D perf_pmus__scan(pmu))) pmu_num++; - } =20 ret =3D do_write(ff, &pmu_num, sizeof(pmu_num)); if (ret < 0) return ret; =20 while ((pmu =3D perf_pmus__scan(pmu))) { - if (!pmu->name) - continue; - ret =3D do_write(ff, &pmu->type, sizeof(pmu->type)); if (ret < 0) return ret; diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c index c07fe3a907220..39ffe8ceb3809 100644 --- a/tools/perf/util/mem-events.c +++ b/tools/perf/util/mem-events.c @@ -37,7 +37,7 @@ struct perf_mem_event * __weak perf_mem_events__ptr(int i) return &perf_mem_events[i]; } =20 -char * __weak perf_mem_events__name(int i, char *pmu_name __maybe_unused) +const char * __weak perf_mem_events__name(int i, const char *pmu_name __m= aybe_unused) { struct perf_mem_event *e =3D perf_mem_events__ptr(i); =20 @@ -53,7 +53,7 @@ char * __weak perf_mem_events__name(int i, char *pmu_name= __maybe_unused) return mem_loads_name; } =20 - return (char *)e->name; + return e->name; } =20 __weak bool is_mem_loads_aux_event(struct evsel *leader __maybe_unused) @@ -186,7 +186,6 @@ int perf_mem_events__record_args(const char **rec_argv,= int *argv_nr, int i =3D *argv_nr, k =3D 0; struct perf_mem_event *e; struct perf_pmu *pmu; - char *s; =20 for (int j =3D 0; j < PERF_MEM_EVENTS__MAX; j++) { e =3D perf_mem_events__ptr(j); @@ -209,15 +208,16 @@ int perf_mem_events__record_args(const char **rec_arg= v, int *argv_nr, } =20 while ((pmu =3D perf_pmus__scan(pmu)) !=3D NULL) { + const char *s =3D perf_mem_events__name(j, pmu->name); + rec_argv[i++] =3D "-e"; - s =3D perf_mem_events__name(j, pmu->name); if (s) { - s =3D strdup(s); - if (!s) + char *copy =3D strdup(s); + if (!copy) return -1; =20 - rec_argv[i++] =3D s; - rec_tmp[k++] =3D s; + rec_argv[i++] =3D copy; + rec_tmp[k++] =3D copy; } } } diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h index 12372309d60ed..b40ad6ea93fcd 100644 --- a/tools/perf/util/mem-events.h +++ b/tools/perf/util/mem-events.h @@ -38,7 +38,7 @@ extern unsigned int perf_mem_events__loads_ldlat; int perf_mem_events__parse(const char *str); int perf_mem_events__init(void); =20 -char *perf_mem_events__name(int i, char *pmu_name); +const char *perf_mem_events__name(int i, const char *pmu_name); struct perf_mem_event *perf_mem_events__ptr(int i); bool is_mem_loads_aux_event(struct evsel *leader); =20 diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 979fc92c2f47d..596ba10129870 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -271,7 +271,7 @@ __add_event(struct list_head *list, int *idx, evsel->core.is_pmu_core =3D pmu ? pmu->is_core : false; evsel->auto_merge_stats =3D auto_merge_stats; evsel->pmu =3D pmu; - evsel->pmu_name =3D pmu && pmu->name ? strdup(pmu->name) : NULL; + evsel->pmu_name =3D pmu ? strdup(pmu->name) : NULL; =20 if (name) evsel->name =3D strdup(name); @@ -446,9 +446,6 @@ bool parse_events__filter_pmu(const struct parse_events= _state *parse_state, if (parse_state->pmu_filter =3D=3D NULL) return false; =20 - if (pmu->name =3D=3D NULL) - return true; - return strcmp(parse_state->pmu_filter, pmu->name) !=3D 0; } =20 @@ -1551,7 +1548,7 @@ static bool config_term_percore(struct list_head *con= fig_terms) } =20 int parse_events_add_pmu(struct parse_events_state *parse_state, - struct list_head *list, char *name, + struct list_head *list, const char *name, struct list_head *head_config, bool auto_merge_stats) { diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h index b0eb95f93e9c3..8e8682ca84654 100644 --- a/tools/perf/util/parse-events.h +++ b/tools/perf/util/parse-events.h @@ -190,7 +190,7 @@ int parse_events_add_breakpoint(struct parse_events_sta= te *parse_state, u64 addr, char *type, u64 len, struct list_head *head_config); int parse_events_add_pmu(struct parse_events_state *parse_state, - struct list_head *list, char *name, + struct list_head *list, const char *name, struct list_head *head_config, bool auto_merge_stats); =20 diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index a049c577bae3d..59108f70d1e45 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -312,7 +312,7 @@ PE_NAME opt_pmu_config } =20 while ((pmu =3D perf_pmus__scan(pmu)) !=3D NULL) { - char *name =3D pmu->name; + const char *name =3D pmu->name; =20 if (parse_events__filter_pmu(parse_state, pmu)) continue; diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index d5406effc1695..f20fcea215e4b 100644 --- a/tools/perf/util/pmu.c +++ b/tools/perf/util/pmu.c @@ -29,7 +29,9 @@ #include "fncache.h" #include "util/evsel_config.h" =20 -struct perf_pmu perf_pmu__fake; +struct perf_pmu perf_pmu__fake =3D { + .name =3D "fake", +}; =20 /** * struct perf_pmu_format - Values from a format file read from @@ -840,13 +842,13 @@ perf_pmu__get_default_config(struct perf_pmu *pmu __m= aybe_unused) return NULL; } =20 -char * __weak +const char * __weak pmu_find_real_name(const char *name) { - return (char *)name; + return name; } =20 -char * __weak +const char * __weak pmu_find_alias_name(const char *name __maybe_unused) { return NULL; @@ -866,8 +868,8 @@ struct perf_pmu *perf_pmu__lookup(struct list_head *pmu= s, int dirfd, const char LIST_HEAD(format); LIST_HEAD(aliases); __u32 type; - char *name =3D pmu_find_real_name(lookup_name); - char *alias_name; + const char *name =3D pmu_find_real_name(lookup_name); + const char *alias_name; =20 /* * The pmu data we store & need consists of the pmu @@ -1710,7 +1712,7 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *p= mu, __u64 config, name ?: "N/A", buf, config_name, config); } =20 -int perf_pmu__match(char *pattern, char *name, char *tok) +int perf_pmu__match(const char *pattern, const char *name, const char *tok) { if (!name) return -1; diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h index 6b414cecbad22..461af638399c9 100644 --- a/tools/perf/util/pmu.h +++ b/tools/perf/util/pmu.h @@ -39,7 +39,7 @@ struct perf_pmu_caps { */ struct perf_pmu { /** @name: The name of the PMU such as "cpu". */ - char *name; + const char *name; /** * @alias_name: Optional alternate name for the PMU determined in * architecture specific code. @@ -275,10 +275,10 @@ void perf_pmu__warn_invalid_config(struct perf_pmu *p= mu, __u64 config, const char *config_name); void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu); =20 -int perf_pmu__match(char *pattern, char *name, char *tok); +int perf_pmu__match(const char *pattern, const char *name, const char *tok= ); =20 -char *pmu_find_real_name(const char *name); -char *pmu_find_alias_name(const char *name); +const char *pmu_find_real_name(const char *name); +const char *pmu_find_alias_name(const char *name); double perf_pmu__cpu_slots_per_cycle(void); int perf_pmu__event_source_devices_scnprintf(char *pathname, size_t size); int perf_pmu__pathname_scnprintf(char *buf, size_t size, --=20 2.42.0