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Mon, 10 Nov 2025 06:43:10 -0800 (PST) From: Masaharu Noguchi To: Jeff Layton , Chuck Lever Cc: Jesper Juhl , David Laight , Alexander Aring , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Masaharu Noguchi Subject: [PATCH v2 2/2] samples: vfs: avoid libc AT_RENAME_* redefinitions Date: Mon, 10 Nov 2025 23:42:32 +0900 Message-ID: <20251110144232.3765169-3-nogunix@gmail.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251110144232.3765169-1-nogunix@gmail.com> References: <20251110144232.3765169-1-nogunix@gmail.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Users building the sample after including libc headers such as stdio.h may inherit libc's AT_RENAME_* macros before is pulled in. When that happens, the sample ends up with conflicting definitions or the libc values leak into the rest of the build. Drop any existing AT_RENAME_* macros before including the uapi header so that the sample always uses the kernel values and does not trip -Werror redefinition checks. Signed-off-by: Masaharu Noguchi --- samples/vfs/test-statx.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/samples/vfs/test-statx.c b/samples/vfs/test-statx.c index 49c7a46cee07..0123ab4efe0a 100644 --- a/samples/vfs/test-statx.c +++ b/samples/vfs/test-statx.c @@ -20,7 +20,16 @@ #include #include #include + +/* Undefine AT_RENAME_* macros that may have been set by libc headers + * (e.g. stdio.h) to avoid redefinition conflicts with uapi fcntl.h. + */ +#undef AT_RENAME_NOREPLACE +#undef AT_RENAME_EXCHANGE +#undef AT_RENAME_WHITEOUT + #include + #define statx foo #define statx_timestamp foo_timestamp struct statx; -- 2.51.1