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x86/cfi: Clean up linkage

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With the introduction of kCFI the addition of ENDBR to
SYM_FUNC_START* no longer suffices to make the function indirectly
callable. This now requires the use of SYM_TYPED_FUNC_START.

As such, remove the implicit ENDBR from SYM_FUNC_START* and add some
explicit annotations to fix things up again.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lore.kernel.org/r/20250207122546.409116003@infradead.org
This commit is contained in:
Peter Zijlstra
2025-02-07 13:15:33 +01:00
parent 2981557cb0
commit 582077c940
29 changed files with 103 additions and 23 deletions
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10
include/linux/compiler.h
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@@ -212,6 +212,16 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
#endif /* __KERNEL__ */
#if defined(CONFIG_CFI_CLANG) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
/*
* Force a reference to the external symbol so the compiler generates
* __kcfi_typid.
*/
#define KCFI_REFERENCE(sym) __ADDRESSABLE(sym)
#else
#define KCFI_REFERENCE(sym)
#endif
/**
* offset_to_ptr - convert a relative memory offset to an absolute pointer
* @off: the address of the 32-bit offset value