mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 16:07:39 +00:00
c03b0358ab
The kbuild bot reported a build breakage with CONFIG_RETPOLINE=n due to commitaaa5d90b39("net: use indirect call wrappers at GRO network layer"). I screwed the wrapper implementation for such config. Fix the issue properly ignoring the builtin symbols arguments, when retpoline is not enabled. Reported-by: kbuild test robot <lkp@intel.com> Fixes:aaa5d90b39("net: use indirect call wrappers at GRO network layer") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_INDIRECT_CALL_WRAPPER_H
|
|
#define _LINUX_INDIRECT_CALL_WRAPPER_H
|
|
|
|
#ifdef CONFIG_RETPOLINE
|
|
|
|
/*
|
|
* INDIRECT_CALL_$NR - wrapper for indirect calls with $NR known builtin
|
|
* @f: function pointer
|
|
* @f$NR: builtin functions names, up to $NR of them
|
|
* @__VA_ARGS__: arguments for @f
|
|
*
|
|
* Avoid retpoline overhead for known builtin, checking @f vs each of them and
|
|
* eventually invoking directly the builtin function. The functions are check
|
|
* in the given order. Fallback to the indirect call.
|
|
*/
|
|
#define INDIRECT_CALL_1(f, f1, ...) \
|
|
({ \
|
|
likely(f == f1) ? f1(__VA_ARGS__) : f(__VA_ARGS__); \
|
|
})
|
|
#define INDIRECT_CALL_2(f, f2, f1, ...) \
|
|
({ \
|
|
likely(f == f2) ? f2(__VA_ARGS__) : \
|
|
INDIRECT_CALL_1(f, f1, __VA_ARGS__); \
|
|
})
|
|
|
|
#define INDIRECT_CALLABLE_DECLARE(f) f
|
|
#define INDIRECT_CALLABLE_SCOPE
|
|
|
|
#else
|
|
#define INDIRECT_CALL_1(f, f1, ...) f(__VA_ARGS__)
|
|
#define INDIRECT_CALL_2(f, f2, f1, ...) f(__VA_ARGS__)
|
|
#define INDIRECT_CALLABLE_DECLARE(f)
|
|
#define INDIRECT_CALLABLE_SCOPE static
|
|
#endif
|
|
|
|
/*
|
|
* We can use INDIRECT_CALL_$NR for ipv6 related functions only if ipv6 is
|
|
* builtin, this macro simplify dealing with indirect calls with only ipv4/ipv6
|
|
* alternatives
|
|
*/
|
|
#if IS_BUILTIN(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
|
|
|
|
#endif
|