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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48fed084f92sm9474430f8f.29.2026.11.05.03.03.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 03:03:34 -0800 (PST) Date: Thu, 5 Nov 2026 11:03:33 +0000 From: David Laight To: Sasha Levin Cc: Steven Rostedt , Masami Hiramatsu , Beau Belgrave , linux-trace-kernel@vger.kernel.org, Shuah Khan , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] selftests/user_events: cast pointers through uintptr_t Message-ID: <20261105110333.0fa21741@pumpkin> In-Reply-To: <20261103163913.640876-1-sashal@kernel.org> References: <20261103163913.640876-1-sashal@kernel.org> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 3 Nov 2026 11:39:13 -0500 Sasha Levin wrote: > From: Sasha Levin > To: Steven Rostedt , Masami Hiramatsu > Cc: Beau Belgrave , linux-trace-kernel@vger.kernel.org, Shuah Khan , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org > Subject: [PATCH] selftests/user_events: cast pointers through uintptr_t > Date: Tue, 3 Nov 2026 11:39:13 -0500 > > The tests put pointers into the 64-bit fields of struct user_reg and > struct user_unreg with a plain (__u64) cast, which warns on 32-bit > architectures: > > abi_test.c:182:25: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] > > Cast through uintptr_t. > > Signed-off-by: Sasha Levin > --- > Found with 32-bit builds of the selftests (gcc 16 and clang 21 with > -m32, with and without -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64); > KernelCI's 32-bit arm builds show the same warnings. The changed files > build without them now, and the x86_64 builds don't change. > > .../testing/selftests/user_events/abi_test.c | 10 +++--- > .../testing/selftests/user_events/dyn_test.c | 6 ++-- > .../selftests/user_events/ftrace_test.c | 32 +++++++++---------- > .../testing/selftests/user_events/perf_test.c | 10 +++--- > 4 files changed, 29 insertions(+), 29 deletions(-) > > diff --git a/tools/testing/selftests/user_events/abi_test.c b/tools/testing/selftests/user_events/abi_test.c > index b71813eaf5c04..21e1e3cca1979 100644 > --- a/tools/testing/selftests/user_events/abi_test.c > +++ b/tools/testing/selftests/user_events/abi_test.c > @@ -179,10 +179,10 @@ static int reg_enable_multi(void *enable, int size, int bit, int flags, > } > > reg.size = sizeof(reg); > - reg.name_args = (__u64)full_args; > + reg.name_args = (__u64)(uintptr_t)full_args; I'm sure you can't need both casts. David