From: KP Singh <kpsingh@kernel.org>
To: linux-security-module@vger.kernel.org, bpf@vger.kernel.org
Cc: ast@kernel.org, paul@paul-moore.com, casey@schaufler-ca.com,
andrii@kernel.org, keescook@chromium.org, daniel@iogearbox.net,
renauld@google.com, revest@chromium.org, song@kernel.org,
KP Singh <kpsingh@kernel.org>
Subject: [PATCH v11 1/5] kernel: Add helper macros for loop unrolling
Date: Thu, 9 May 2024 22:14:17 +0200 [thread overview]
Message-ID: <20240509201421.905965-2-kpsingh@kernel.org> (raw)
In-Reply-To: <20240509201421.905965-1-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>
Acked-by: Andrii Nakryiko <andrii@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 */
--
2.45.0.118.g7fe29c98d7-goog
next prev parent reply other threads:[~2024-05-09 20:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-09 20:14 [PATCH v11 0/5] Reduce overhead of LSMs with static calls KP Singh
2024-05-09 20:14 ` KP Singh [this message]
2024-05-09 20:14 ` [PATCH v11 2/5] security: Count the LSMs enabled at compile time KP Singh
2024-05-10 16:47 ` Casey Schaufler
2024-05-09 20:14 ` [PATCH v11 3/5] security: Replace indirect LSM hook calls with static calls KP Singh
2024-05-09 20:14 ` [PATCH v11 4/5] security: Update non standard hooks to use " KP Singh
2024-05-10 17:08 ` Casey Schaufler
2024-05-13 19:01 ` Kees Cook
2024-05-09 20:14 ` [PATCH v11 5/5] bpf: Only enable BPF LSM hooks when an LSM program is attached KP Singh
2024-05-09 21:55 ` Tetsuo Handa
2024-05-10 17:11 ` Casey Schaufler
2024-05-13 19:02 ` Kees Cook
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