forked from mirrors/linux
4589f199eb
Merge in pending alternatives patching infrastructure changes, before applying more patches. Signed-off-by: Ingo Molnar <mingo@kernel.org>
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_INDIRECT_CALL_WRAPPER_H
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#define _LINUX_INDIRECT_CALL_WRAPPER_H
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#ifdef CONFIG_MITIGATION_RETPOLINE
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/*
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* INDIRECT_CALL_$NR - wrapper for indirect calls with $NR known builtin
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* @f: function pointer
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* @f$NR: builtin functions names, up to $NR of them
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* @__VA_ARGS__: arguments for @f
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*
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* Avoid retpoline overhead for known builtin, checking @f vs each of them and
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* eventually invoking directly the builtin function. The functions are checked
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* in the given order. Fallback to the indirect call.
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*/
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#define INDIRECT_CALL_1(f, f1, ...) \
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({ \
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likely(f == f1) ? f1(__VA_ARGS__) : f(__VA_ARGS__); \
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})
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#define INDIRECT_CALL_2(f, f2, f1, ...) \
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({ \
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likely(f == f2) ? f2(__VA_ARGS__) : \
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INDIRECT_CALL_1(f, f1, __VA_ARGS__); \
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})
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#define INDIRECT_CALL_3(f, f3, f2, f1, ...) \
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({ \
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likely(f == f3) ? f3(__VA_ARGS__) : \
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INDIRECT_CALL_2(f, f2, f1, __VA_ARGS__); \
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})
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#define INDIRECT_CALL_4(f, f4, f3, f2, f1, ...) \
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({ \
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likely(f == f4) ? f4(__VA_ARGS__) : \
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INDIRECT_CALL_3(f, f3, f2, f1, __VA_ARGS__); \
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})
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#define INDIRECT_CALLABLE_DECLARE(f) f
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#define INDIRECT_CALLABLE_SCOPE
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#define EXPORT_INDIRECT_CALLABLE(f) EXPORT_SYMBOL(f)
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#else
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#define INDIRECT_CALL_1(f, f1, ...) f(__VA_ARGS__)
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#define INDIRECT_CALL_2(f, f2, f1, ...) f(__VA_ARGS__)
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#define INDIRECT_CALL_3(f, f3, f2, f1, ...) f(__VA_ARGS__)
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#define INDIRECT_CALL_4(f, f4, f3, f2, f1, ...) f(__VA_ARGS__)
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#define INDIRECT_CALLABLE_DECLARE(f)
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#define INDIRECT_CALLABLE_SCOPE static
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#define EXPORT_INDIRECT_CALLABLE(f)
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#endif
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/*
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* We can use INDIRECT_CALL_$NR for ipv6 related functions only if ipv6 is
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* builtin, this macro simplify dealing with indirect calls with only ipv4/ipv6
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* alternatives
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*/
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#if IS_BUILTIN(CONFIG_IPV6)
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#define INDIRECT_CALL_INET(f, f2, f1, ...) \
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INDIRECT_CALL_2(f, f2, f1, __VA_ARGS__)
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#elif IS_ENABLED(CONFIG_INET)
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#define INDIRECT_CALL_INET(f, f2, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__)
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#else
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#define INDIRECT_CALL_INET(f, f2, f1, ...) f(__VA_ARGS__)
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#endif
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#if IS_ENABLED(CONFIG_INET)
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#define INDIRECT_CALL_INET_1(f, f1, ...) INDIRECT_CALL_1(f, f1, __VA_ARGS__)
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#else
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#define INDIRECT_CALL_INET_1(f, f1, ...) f(__VA_ARGS__)
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#endif
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#endif
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