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From: KP Singh <kpsingh@kernel.org>
To: linux-security-module@vger.kernel.org, bpf@vger.kernel.org
Cc: paul@paul-moore.com, keescook@chromium.org,
	casey@schaufler-ca.com, song@kernel.org, daniel@iogearbox.net,
	ast@kernel.org, kpsingh@kernel.org, renauld@google.com
Subject: [PATCH v4 1/5] kernel: Add helper macros for loop unrolling
Date: Fri, 22 Sep 2023 16:55:01 +0200	[thread overview]
Message-ID: <20230922145505.4044003-2-kpsingh@kernel.org> (raw)
In-Reply-To: <20230922145505.4044003-1-kpsingh@kernel.org>

This helps in easily initializing blocks of code (e.g. static calls and
keys).

UNROLL(N, MACRO, __VA_ARGS__) calls MACRO N times with the first
argument as the index of the iteration. This allows string pasting to
create unique tokens for variable names, function calls etc.

As an example:

	#include <linux/unroll.h>

	#define MACRO(N, a, b)            \
		int add_##N(int a, int b) \
		{                         \
			return a + b + N; \
		}

	UNROLL(2, MACRO, x, y)

expands to:

	int add_0(int x, int y)
	{
		return x + y + 0;
	}

	int add_1(int x, int y)
	{
		return x + y + 1;
	}

Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: KP Singh <kpsingh@kernel.org>
---
 include/linux/unroll.h | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 include/linux/unroll.h

diff --git a/include/linux/unroll.h b/include/linux/unroll.h
new file mode 100644
index 000000000000..d42fd6366373
--- /dev/null
+++ b/include/linux/unroll.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+/*
+ * Copyright (C) 2023 Google LLC.
+ */
+
+#ifndef __UNROLL_H
+#define __UNROLL_H
+
+#include <linux/args.h>
+
+#define UNROLL(N, MACRO, args...) CONCATENATE(__UNROLL_, N)(MACRO, args)
+
+#define __UNROLL_0(MACRO, args...)
+#define __UNROLL_1(MACRO, args...)  __UNROLL_0(MACRO, args)  MACRO(0, args)
+#define __UNROLL_2(MACRO, args...)  __UNROLL_1(MACRO, args)  MACRO(1, args)
+#define __UNROLL_3(MACRO, args...)  __UNROLL_2(MACRO, args)  MACRO(2, args)
+#define __UNROLL_4(MACRO, args...)  __UNROLL_3(MACRO, args)  MACRO(3, args)
+#define __UNROLL_5(MACRO, args...)  __UNROLL_4(MACRO, args)  MACRO(4, args)
+#define __UNROLL_6(MACRO, args...)  __UNROLL_5(MACRO, args)  MACRO(5, args)
+#define __UNROLL_7(MACRO, args...)  __UNROLL_6(MACRO, args)  MACRO(6, args)
+#define __UNROLL_8(MACRO, args...)  __UNROLL_7(MACRO, args)  MACRO(7, args)
+#define __UNROLL_9(MACRO, args...)  __UNROLL_8(MACRO, args)  MACRO(8, args)
+#define __UNROLL_10(MACRO, args...) __UNROLL_9(MACRO, args)  MACRO(9, args)
+#define __UNROLL_11(MACRO, args...) __UNROLL_10(MACRO, args) MACRO(10, args)
+#define __UNROLL_12(MACRO, args...) __UNROLL_11(MACRO, args) MACRO(11, args)
+#define __UNROLL_13(MACRO, args...) __UNROLL_12(MACRO, args) MACRO(12, args)
+#define __UNROLL_14(MACRO, args...) __UNROLL_13(MACRO, args) MACRO(13, args)
+#define __UNROLL_15(MACRO, args...) __UNROLL_14(MACRO, args) MACRO(14, args)
+#define __UNROLL_16(MACRO, args...) __UNROLL_15(MACRO, args) MACRO(15, args)
+#define __UNROLL_17(MACRO, args...) __UNROLL_16(MACRO, args) MACRO(16, args)
+#define __UNROLL_18(MACRO, args...) __UNROLL_17(MACRO, args) MACRO(17, args)
+#define __UNROLL_19(MACRO, args...) __UNROLL_18(MACRO, args) MACRO(18, args)
+#define __UNROLL_20(MACRO, args...) __UNROLL_19(MACRO, args) MACRO(19, args)
+
+#endif /* __UNROLL_H */
-- 
2.42.0.515.g380fc7ccd1-goog


  reply	other threads:[~2023-09-22 14:55 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-22 14:55 [PATCH v4 0/5] Reduce overhead of LSMs with static calls KP Singh
2023-09-22 14:55 ` KP Singh [this message]
2023-09-22 14:55 ` [PATCH v4 2/5] security: Count the LSMs enabled at compile time KP Singh
2023-09-22 15:50   ` Kees Cook
2023-09-22 16:07     ` KP Singh
2023-09-27 22:37       ` KP Singh
2023-09-22 14:55 ` [PATCH v4 3/5] security: Replace indirect LSM hook calls with static calls KP Singh
2023-09-23 14:52   ` kernel test robot
2023-09-27  5:26   ` kernel test robot
2023-09-22 14:55 ` [PATCH v4 4/5] bpf: Only enable BPF LSM hooks when an LSM program is attached KP Singh
2023-09-22 14:55 ` [PATCH v4 5/5] security: Add CONFIG_SECURITY_HOOK_LIKELY KP Singh
2023-09-22 15:50   ` Kees Cook
2023-09-22 15:51 ` [PATCH v4 0/5] Reduce overhead of LSMs with static calls Kees Cook
2023-09-22 18:42 ` Mateusz Guzik
2023-09-23 16:16   ` KP Singh
2023-09-23 17:13     ` Mateusz Guzik
2023-09-23 17:15       ` Mateusz Guzik
2023-09-24  2:46         ` Kees Cook
2023-09-25 20:08           ` Mateusz Guzik
2023-09-25 22:02             ` Kees Cook

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