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net: add EXPORT_INDIRECT_CALLABLE wrapper 

When a static function is annotated with INDIRECT_CALLABLE_SCOPE and
CONFIG_RETPOLINE is set, the static keyword is removed. Sometimes the
function needs to be exported but EXPORT_SYMBOL can't be used because if
CONFIG_RETPOLINE is not set, we will attempt to export a static symbol.

This patch introduces a new indirect call wrapper:
EXPORT_INDIRECT_CALLABLE. This basically does EXPORT_SYMBOL when
CONFIG_RETPOLINE is set, but does nothing when it's not.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Brian Vazquez <brianvv@google.com>
Link: https://lore.kernel.org/r/20210204181839.558951-1-brianvv@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Brian Vazquez 2021-02-04 18:18:38 +00:00 committed by Jakub Kicinski
parent 7e3ce05e7f
commit 0053859496
1 changed files with 2 additions and 0 deletions
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2
include/linux/indirect_call_wrapper.h
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@ -36,6 +36,7 @@
#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__)
@ -44,6 +45,7 @@
#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
/*