From: Leo Yan <leo.yan@arm.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexandre Ghiti <alex@ghiti.fr>,
James Clark <james.clark@linaro.org>
Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
llvm@lists.linux.dev, linux-riscv@lists.infradead.org,
Leo Yan <leo.yan@arm.com>
Subject: [PATCH v2 5/8] perf test coresight: Dismiss clang warning for thread loop
Date: Tue, 30 Sep 2025 17:54:53 +0100 [thread overview]
Message-ID: <20250930-perf_build_android_ndk-v2-5-2ea440b7ef01@arm.com> (raw)
In-Reply-To: <20250930-perf_build_android_ndk-v2-0-2ea440b7ef01@arm.com>
clang-18.1.3 on Ubuntu 24.04.2 reports warning:
thread_loop.c:41:23: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
41 | : /* in */ [i] "r" (i), [len] "r" (len)
| ^
thread_loop.c:37:8: note: use constraint modifier "w"
37 | "add %[i], %[i], #1\n"
| ^~~~
| %w[i]
thread_loop.c:41:23: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
41 | : /* in */ [i] "r" (i), [len] "r" (len)
| ^
thread_loop.c:37:14: note: use constraint modifier "w"
37 | "add %[i], %[i], #1\n"
| ^~~~
| %w[i]
thread_loop.c:41:23: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
41 | : /* in */ [i] "r" (i), [len] "r" (len)
| ^
thread_loop.c:38:8: note: use constraint modifier "w"
38 | "cmp %[i], %[len]\n"
| ^~~~
| %w[i]
thread_loop.c:41:38: warning: value size does not match register size specified by the constraint and modifier [-Wasm-operand-widths]
41 | : /* in */ [i] "r" (i), [len] "r" (len)
| ^
thread_loop.c:38:14: note: use constraint modifier "w"
38 | "cmp %[i], %[len]\n"
| ^~~~~~
| %w[len]
Use the modifier "w" for 32-bit register access.
Signed-off-by: Leo Yan <leo.yan@arm.com>
---
tools/perf/tests/shell/coresight/thread_loop/thread_loop.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/perf/tests/shell/coresight/thread_loop/thread_loop.c b/tools/perf/tests/shell/coresight/thread_loop/thread_loop.c
index e05a559253ca9d9366ad321d520349042fb07fca..86f3f548b00631682767665fc5e9d5b8551a3634 100644
--- a/tools/perf/tests/shell/coresight/thread_loop/thread_loop.c
+++ b/tools/perf/tests/shell/coresight/thread_loop/thread_loop.c
@@ -34,8 +34,8 @@ static void *thrfn(void *arg)
}
asm volatile(
"loop:\n"
- "add %[i], %[i], #1\n"
- "cmp %[i], %[len]\n"
+ "add %w[i], %w[i], #1\n"
+ "cmp %w[i], %w[len]\n"
"blt loop\n"
: /* out */
: /* in */ [i] "r" (i), [len] "r" (len)
--
2.34.1
next prev parent reply other threads:[~2025-09-30 16:55 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-30 16:54 [PATCH v2 0/8] perf build: Support building with Clang Leo Yan
2025-09-30 16:54 ` [PATCH v2 1/8] tools build: Align warning options with perf Leo Yan
2025-09-30 16:54 ` [PATCH v2 2/8] perf python: split Clang options when invoking Popen Leo Yan
2025-09-30 16:54 ` [PATCH v2 3/8] perf: build: Correct CROSS_ARCH for clang Leo Yan
2025-09-30 16:54 ` [PATCH v2 4/8] perf test coresight: Dismiss clang warning for memcpy thread Leo Yan
2025-09-30 16:54 ` Leo Yan [this message]
2025-09-30 16:54 ` [PATCH v2 6/8] perf test coresight: Dismiss clang warning for unroll loop thread Leo Yan
2025-09-30 16:54 ` [PATCH v2 7/8] perf build: Support build with clang Leo Yan
2025-09-30 16:54 ` [PATCH v2 8/8] perf docs: Document building with Clang Leo Yan
2025-09-30 18:14 ` [PATCH v2 0/8] perf build: Support " Ian Rogers
2025-10-01 13:45 ` Arnaldo Carvalho de Melo
2025-10-01 14:21 ` Arnaldo Carvalho de Melo
2025-10-01 15:22 ` Leo Yan
2025-10-01 18:25 ` Arnaldo Carvalho de Melo
2025-10-01 18:32 ` Leo Yan
2025-10-01 20:20 ` Leo Yan
2025-10-02 17:43 ` Arnaldo Carvalho de Melo
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