linux-kernel - [PATCH v1] perf: Fix libjvmti.c sign compare error

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Message-ID: <20250604173632.2362759-1-yuzhuo@google.com>
Date: Wed,  4 Jun 2025 10:36:32 -0700
From: Yuzhuo Jing <yuzhuo@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Liang Kan <kan.liang@...ux.intel.com>, Yuzhuo Jing <yuzhuo@...gle.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] perf: Fix libjvmti.c sign compare error

Fix the compile errors when compiling with -Werror=sign-compare.

This is a follow-up patch to a previous patch series for a separate
issue.  Link: https://lore.kernel.org/lkml/aC9lXhPFcs5fkHWH@x1/

Signed-off-by: Yuzhuo Jing <yuzhuo@...gle.com>
---
 tools/perf/jvmti/libjvmti.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/jvmti/libjvmti.c b/tools/perf/jvmti/libjvmti.c
index fcca275e5bf9..82514e6532b8 100644
--- a/tools/perf/jvmti/libjvmti.c
+++ b/tools/perf/jvmti/libjvmti.c
@@ -141,11 +141,11 @@ copy_class_filename(const char * class_sign, const char * file_name, char * resu
 	* Assume path name is class hierarchy, this is a common practice with Java programs
 	*/
 	if (*class_sign == 'L') {
-		int j, i = 0;
+		size_t j, i = 0;
 		char *p = strrchr(class_sign, '/');
 		if (p) {
 			/* drop the 'L' prefix and copy up to the final '/' */
-			for (i = 0; i < (p - class_sign); i++)
+			for (i = 0; i < (size_t)(p - class_sign); i++)
 				result[i] = class_sign[i+1];
 		}
 		/*
-- 
2.50.0.rc1.591.g9c95f17f64-goog