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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_INDIRECT_CALL_WRAPPER_H#define _LINUX_INDIRECT_CALL_WRAPPER_H
#ifdef CONFIG_MITIGATION_RETPOLINE
/* * INDIRECT_CALL_$NR - wrapper for indirect calls with $NR known builtin * @f: function pointer * @f$NR: builtin functions names, up to $NR of them * @__VA_ARGS__: arguments for @f * * Avoid retpoline overhead for known builtin, checking @f vs each of them and * eventually invoking directly the builtin function. The functions are checked * in the given order. Fallback to the indirect call. */#define INDIRECT_CALL_1(f, f1, ...) \ ({ \ typeof(f) __f1 = (f); \ likely(__f1 == f1) ? f1(__VA_ARGS__) : __f1(__VA_ARGS__); \ })#define INDIRECT_CALL_2(f, f2, f1, ...) \ ({ \ typeof(f) __f2 = (f); \ likely(__f2 == f2) ? f2(__VA_ARGS__) : \ INDIRECT_CALL_1(__f2, f1, __VA_ARGS__); \ })#define INDIRECT_CALL_3(f, f3, f2, f1, ...) \ ({ \ typeof(f) __f3 = (f); \ likely(__f3 == f3) ? f3(__VA_ARGS__) : \ INDIRECT_CALL_2(__f3, f2, f1, __VA_ARGS__); \ })#define INDIRECT_CALL_4(f, f4, f3, f2, f1, ...) \ ({ \ typeof(f) __f4 = (f); \ likely(__f4 == f4) ? f4(__VA_ARGS__) : \ INDIRECT_CALL_3(__f4, f3, f2, f1, __VA_ARGS__); \ })
#define INDIRECT_CALLABLE_DECLARE(f) f#define INDIRECT_CALLABLE_SCOPE#define EXPORT_INDIRECT_CALLABLE(f) EXPORT_SYMBOL(f)
#else#define INDIRECT_CALL_1(f, f1, ...) f(__VA_ARGS__)#define INDIRECT_CALL_2(f, f2, f1, ...) f(__VA_ARGS__)#define INDIRECT_CALL_3(f, f3, f2, f1, ...) f(__VA_ARGS__)#define INDIRECT_CALL_4(f, f4, f3, f2, f1, ...) f(__VA_ARGS__)#define INDIRECT_CALLABLE_DECLARE(f)#define INDIRECT_CALLABLE_SCOPE static#define EXPORT_INDIRECT_CALLABLE(f)#endif
/* * We can use INDIRECT_CALL_$NR for ipv6 related functions only if ipv6 is * builtin, this macro simplify dealing with indirect calls with only ipv4/ipv6 * alternatives */#if IS_ENABLED(CONFIG_IPV6)#define INDIRECT_CALL_INET(f, f2, f1, ...) \ INDIRECT_CALL_2(f, f2, f1, __VA_ARGS__)#elif IS_ENABLED(CONFIG_INET)#define INDIRECT_CALL_INET(f, f2, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__)#else#define INDIRECT_CALL_INET(f, f2, f1, ...) f(__VA_ARGS__)#endif
#if IS_ENABLED(CONFIG_INET)#define INDIRECT_CALL_INET_1(f, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__)#else#define INDIRECT_CALL_INET_1(f, f1, ...) f(__VA_ARGS__)#endif
#endif