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Wed, 29 Apr 2026 09:57:19 -0700 (PDT) Received: from LAPTOP-DFRI2QR0.localdomain ([134.208.63.146]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c7fd64f09e5sm2389850a12.16.2026.04.29.09.57.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Apr 2026 09:57:19 -0700 (PDT) From: Qian-Yu Lin To: rostedt@goodmis.org, mhiramat@kernel.org Cc: mathieu.desnoyers@efficios.com, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Qian-Yu Lin Subject: [PATCH] trace_printk: replace _______STR with __UNIQUE_ID(STR) Date: Thu, 30 Apr 2026 00:57:07 +0800 Message-Id: <20260429165707.7020-1-tiffany019230@gmail.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The macro trace_printk() uses a hardcoded identifier _______STR within a statement expression, which can lead to variable name shadowing if a caller happens to use the same name in its scope. Following the pattern in commit 24ba53017e18 ("rcu: Replace ________p1 and _________p1 with __UNIQUE_ID(rcu)") and commit 589a9785ee3a ("min/max: remove sparse warnings when they're nested"), replace the hardcoded identifier with __UNIQUE_ID(STR). Since __UNIQUE_ID() must be expanded once to remain consistent across declaration and sizeof() within the statement expression, introduce a nested helper macro ___trace_printk. Signed-off-by: Qian-Yu Lin --- include/linux/trace_printk.h | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/include/linux/trace_printk.h b/include/linux/trace_printk.h index 2670ec7f4262..060eccb40838 100644 --- a/include/linux/trace_printk.h +++ b/include/linux/trace_printk.h @@ -2,6 +2,7 @@ #ifndef _LINUX_TRACE_PRINTK_H #define _LINUX_TRACE_PRINTK_H +#include #include #include #include @@ -84,15 +85,18 @@ do { \ * let gcc optimize the rest. */ -#define trace_printk(fmt, ...) \ +#define ___trace_printk(fmt, str, ...) \ do { \ - char _______STR[] = __stringify((__VA_ARGS__)); \ - if (sizeof(_______STR) > 3) \ + char str[] = __stringify((__VA_ARGS__)); \ + if (sizeof(str) > 3) \ do_trace_printk(fmt, ##__VA_ARGS__); \ else \ trace_puts(fmt); \ } while (0) +#define trace_printk(fmt, ...) \ + ___trace_printk(fmt, __UNIQUE_ID(str), ##__VA_ARGS__) + #define do_trace_printk(fmt, args...) \ do { \ static const char *trace_printk_fmt __used \ -- 2.25.1