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From: Krzesimir Nowak <krzesimir@kinvolk.io>
To: linux-kernel@vger.kernel.org
Cc: "Alban Crequy" <alban@kinvolk.io>,
	"Iago López Galeiras" <iago@kinvolk.io>,
	"Alexei Starovoitov" <ast@kernel.org>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"Martin KaFai Lau" <kafai@fb.com>,
	"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
	"David S. Miller" <davem@davemloft.net>,
	"Jakub Kicinski" <jakub.kicinski@netronome.com>,
	"Jesper Dangaard Brouer" <hawk@kernel.org>,
	"John Fastabend" <john.fastabend@gmail.com>,
	"Stanislav Fomichev" <sdf@google.com>,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	xdp-newbies@vger.kernel.org,
	"Krzesimir Nowak" <krzesimir@kinvolk.io>
Subject: [bpf-next v3 07/12] tools headers: Adopt compiletime_assert from kernel sources
Date: Mon,  8 Jul 2019 18:31:16 +0200	[thread overview]
Message-ID: <20190708163121.18477-8-krzesimir@kinvolk.io> (raw)
In-Reply-To: <20190708163121.18477-1-krzesimir@kinvolk.io>

This will come in handy to verify that the hardcoded size of the
context data in bpf_test struct is high enough to hold some struct.

Signed-off-by: Krzesimir Nowak <krzesimir@kinvolk.io>
---
 tools/include/linux/compiler.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h
index 1827c2f973f9..b4e97751000a 100644
--- a/tools/include/linux/compiler.h
+++ b/tools/include/linux/compiler.h
@@ -172,4 +172,32 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
 # define __fallthrough
 #endif
 
+
+#ifdef __OPTIMIZE__
+# define __compiletime_assert(condition, msg, prefix, suffix)		\
+	do {								\
+		extern void prefix ## suffix(void) __compiletime_error(msg); \
+		if (!(condition))					\
+			prefix ## suffix();				\
+	} while (0)
+#else
+# define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0)
+#endif
+
+#define _compiletime_assert(condition, msg, prefix, suffix) \
+	__compiletime_assert(condition, msg, prefix, suffix)
+
+/**
+ * compiletime_assert - break build and emit msg if condition is false
+ * @condition: a compile-time constant condition to check
+ * @msg:       a message to emit if condition is false
+ *
+ * In tradition of POSIX assert, this macro will break the build if the
+ * supplied condition is *false*, emitting the supplied error message if the
+ * compiler has support to do so.
+ */
+#define compiletime_assert(condition, msg) \
+	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
+
+
 #endif /* _TOOLS_LINUX_COMPILER_H */
-- 
2.20.1


  parent reply	other threads:[~2019-07-08 16:32 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-08 16:31 [bpf-next v3 00/12] Test the 32bit narrow reads Krzesimir Nowak
2019-07-08 16:31 ` [bpf-next v3 01/12] selftests/bpf: Print a message when tester could not run a program Krzesimir Nowak
2019-07-10 23:44   ` Andrii Nakryiko
2019-07-11 11:36     ` Krzesimir Nowak
2019-07-12  0:10       ` Andrii Nakryiko
2019-07-08 16:31 ` [bpf-next v3 02/12] selftests/bpf: Avoid a clobbering of errno Krzesimir Nowak
2019-07-10 23:51   ` Andrii Nakryiko
2019-07-11 12:04     ` Krzesimir Nowak
2019-07-12  0:59       ` Andrii Nakryiko
2019-07-12 17:31         ` Krzesimir Nowak
2019-07-08 16:31 ` [bpf-next v3 03/12] selftests/bpf: Avoid another case of errno clobbering Krzesimir Nowak
2019-07-10 23:57   ` Andrii Nakryiko
2019-07-11 12:05     ` Krzesimir Nowak
2019-07-08 16:31 ` [bpf-next v3 04/12] selftests/bpf: Use bpf_prog_test_run_xattr Krzesimir Nowak
2019-07-11  0:03   ` Andrii Nakryiko
2019-07-11 12:07     ` Krzesimir Nowak
2019-07-08 16:31 ` [bpf-next v3 05/12] selftests/bpf: Allow passing more information to BPF prog test run Krzesimir Nowak
2019-07-11  1:17   ` Andrii Nakryiko
2019-07-11 12:17     ` Krzesimir Nowak
2019-07-08 16:31 ` [bpf-next v3 06/12] selftests/bpf: Make sure that preexisting tests for perf event work Krzesimir Nowak
2019-07-08 16:31 ` Krzesimir Nowak [this message]
2019-07-12  0:19   ` [bpf-next v3 07/12] tools headers: Adopt compiletime_assert from kernel sources Andrii Nakryiko
2019-07-08 16:31 ` [bpf-next v3 08/12] tools headers: Sync struct bpf_perf_event_data Krzesimir Nowak
2019-07-12  0:21   ` Andrii Nakryiko
2019-07-08 16:31 ` [bpf-next v3 09/12] bpf: Split out some helper functions Krzesimir Nowak
2019-07-08 16:40   ` Krzesimir Nowak
2019-07-11 20:25   ` Stanislav Fomichev
2019-07-08 16:31 ` [bpf-next v3 10/12] bpf: Implement bpf_prog_test_run for perf event programs Krzesimir Nowak
2019-07-11 20:30   ` Stanislav Fomichev
2019-07-08 16:31 ` [bpf-next v3 11/12] selftests/bpf: Add tests for bpf_prog_test_run for perf events progs Krzesimir Nowak
2019-07-12  0:37   ` Andrii Nakryiko
2019-07-12 17:37     ` Krzesimir Nowak
2019-07-12 17:49       ` Andrii Nakryiko
2019-07-08 16:31 ` [bpf-next v3 12/12] selftests/bpf: Test correctness of narrow 32bit read on 64bit field Krzesimir Nowak

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