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[98.38.17.99]) by smtp.googlemail.com with ESMTPSA id 5614622812f47-4a1aa006f74sm799975b6e.0.2026.07.07.19.18.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Jul 2026 19:18:45 -0700 (PDT) From: Jim Cromie Date: Tue, 07 Jul 2026 20:18:12 -0600 Subject: [PATCH v6 12/24] dyndbg: reduce verbose/debug clutter Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260707-dd-maint-2-v6-12-381f3edb0045@gmail.com> References: <20260707-dd-maint-2-v6-0-381f3edb0045@gmail.com> In-Reply-To: <20260707-dd-maint-2-v6-0-381f3edb0045@gmail.com> To: Andrew Morton , Jason Baron , Greg Kroah-Hartman , Jonathan Corbet , Shuah Khan , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Arnd Bergmann , Luis Chamberlain , Petr Pavlu Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, Jim Cromie , Louis Chauvet X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1783477102; l=5280; i=jim.cromie@gmail.com; s=20260203; h=from:subject:message-id; bh=LKcWOgQjOSSos9Y+vfT5MoZ88a0A/4utKPeiOYeZmDI=; b=8Lgqc9DREOjM+ZVTh2w6qFyVZbsU0Kjvp3BUcN6vC2a7lzixoefXPGo5M3mnkjEj+duXIIScm 909ikVkabvjB6DYCgRISjXbILVp6EA3O80ayAxNToEMAyJzcVRudXO+ X-Developer-Key: i=jim.cromie@gmail.com; a=ed25519; pk=C6E5ODlPQo7ZBynATXH9wg7K6HxP0pIXyf4s38Qw0XE= currently, for verbose=3, these are logged (blank lines for clarity): dyndbg: query 0: "class DRM_UT_CORE +p" mod:* dyndbg: split into words: "class" "DRM_UT_CORE" "+p" dyndbg: op='+' dyndbg: flags=0x1 dyndbg: *flagsp=0x1 *maskp=0xffffffff dyndbg: parsed: func="" file="" module="" format="" lineno=0-0 class=... dyndbg: no matches for query dyndbg: no-match: func="" file="" module="" format="" lineno=0-0 class=... dyndbg: processed 1 queries, with 0 matches, 0 errs That is excessive, so this patch: - shrinks 3 lines of 2nd stanza to single line - drops 1st 2 lines of 3rd stanza 3rd line is like 1st, with result, not procedure. 2nd line is just status, retold in 4th, with more info. New output: dyndbg: query 0: "class DRM_UT_CORE +p" dyndbg: split into words: "class" "DRM_UT_CORE" "+p" dyndbg: op='+' flags=0x1 maskp=0xffffffff dyndbg: processed 1 queries, with 0 matches, 0 errs Also drop several verbose=3 messages in ddebug_add_module. When modprobing a module, dyndbg currently logs/says "add-module", and then "skipping" if the module has no prdbgs. Instead just check 1st and return quietly. Unmatched query diagnostics are intentionally restricted to verbose level 3 (v3pr_info_dq) to reduce dmesg output clutter on standard verbose levels (verbose=1 and verbose=2), aligning with the overall de-cluttering of dynamic debug logging. Signed-off-by: Jim Cromie Reviewed-by: Louis Chauvet --- v4: rename vpr_dq_info to v3pr_dq_info to tell its active logging level adjust some vX levels per doc'd intentions v2: RvB after SoB trivial change to verbose-debug output line to output the actual "module" keyword rather than "mod:", and do so only when the module is constrained by the callchain (ie as part of a modprobe). was: query X: "(keyword value)* [+-=]flags" mod:* now: query X: "(keyword value)* [+-=]flags" or query X: module FOO "keyword value)* [+-=]flags" IOW, adjust output to reflect the input grammar more closely. drop-info-parsed vinfo-applied-nomatch dyndbg: tweak verbose-levels per doc --- lib/dynamic_debug.c | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-) diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c index efe12fac6363..2e321b7eb957 100644 --- a/lib/dynamic_debug.c +++ b/lib/dynamic_debug.c @@ -128,7 +128,7 @@ do { \ #define v3pr_info(fmt, ...) vnpr_info(3, fmt, ##__VA_ARGS__) #define v4pr_info(fmt, ...) vnpr_info(4, fmt, ##__VA_ARGS__) -static void vpr_info_dq(const struct ddebug_query *query, const char *msg) +static void v3pr_info_dq(const struct ddebug_query *query, const char *msg) { /* trim any trailing newlines */ int fmtlen = 0; @@ -280,9 +280,6 @@ static int ddebug_change(const struct ddebug_query *query, } mutex_unlock(&ddebug_lock); - if (!nfound && verbose) - pr_info("no matches for query\n"); - return nfound; } @@ -491,7 +488,6 @@ static int ddebug_parse_query(char *words[], int nwords, */ query->module = modname; - vpr_info_dq(query, "parsed"); return 0; } @@ -515,7 +511,6 @@ static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers) pr_err("bad flag-op %c, at start of %s\n", *str, str); return -EINVAL; } - v3pr_info("op='%c'\n", op); for (; *str ; ++str) { for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) { @@ -529,7 +524,6 @@ static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers) return -EINVAL; } } - v3pr_info("flags=0x%x\n", modifiers->flags); /* calculate final flags, mask based upon op */ switch (op) { @@ -545,7 +539,7 @@ static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers) modifiers->flags = 0; break; } - v3pr_info("*flagsp=0x%x *maskp=0x%x\n", modifiers->flags, modifiers->mask); + v3pr_info("op='%c' flags=0x%x maskp=0x%x\n", op, modifiers->flags, modifiers->mask); return 0; } @@ -574,7 +568,7 @@ static int ddebug_exec_query(char *query_string, const char *modname) } /* actually go and implement the change */ nfound = ddebug_change(&query, &modifiers); - vpr_info_dq(&query, nfound ? "applied" : "no-match"); + v3pr_info_dq(&query, nfound ? "applied" : "no-match"); return nfound; } @@ -597,7 +591,10 @@ static int ddebug_exec_queries(char *query, const char *modname) if (!query || !*query || *query == '#') continue; - vpr_info("query %d: \"%s\" mod:%s\n", i, query, modname ?: "*"); + if (modname) + v2pr_info("query %d: module %s \"%s\"\n", i, modname, query); + else + v2pr_info("query %d: \"%s\"\n", i, query); rc = ddebug_exec_query(query, modname); if (rc < 0) { @@ -1163,11 +1160,10 @@ static int ddebug_add_module(struct _ddebug_info *di, const char *modname) { struct ddebug_table *dt; - v3pr_info("add-module: %s.%d sites\n", modname, di->num_descs); - if (!di->num_descs) { - v3pr_info(" skip %s\n", modname); + if (!di->num_descs) return 0; - } + + v3pr_info("add-module: %s %d sites\n", modname, di->num_descs); dt = kzalloc_obj(*dt); if (dt == NULL) { -- 2.55.0