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Clang feature updates for v5.14-rc1

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- Add CC_HAS_NO_PROFILE_FN_ATTR in preparation for PGO support in
   the face of the noinstr attribute, paving the way for PGO and fixing
   GCOV. (Nick Desaulniers)
 
 - x86_64 LTO coverage is expanded to 32-bit x86. (Nathan Chancellor)
 
 - Small fixes to CFI. (Mark Rutland, Nathan Chancellor)
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Merge tag 'clang-features-v5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull clang feature updates from Kees Cook:

 - Add CC_HAS_NO_PROFILE_FN_ATTR in preparation for PGO support in the
   face of the noinstr attribute, paving the way for PGO and fixing
   GCOV. (Nick Desaulniers)

 - x86_64 LTO coverage is expanded to 32-bit x86. (Nathan Chancellor)

 - Small fixes to CFI. (Mark Rutland, Nathan Chancellor)

* tag 'clang-features-v5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  qemu_fw_cfg: Make fw_cfg_rev_attr a proper kobj_attribute
  Kconfig: Introduce ARCH_WANTS_NO_INSTR and CC_HAS_NO_PROFILE_FN_ATTR
  compiler_attributes.h: cleanups for GCC 4.9+
  compiler_attributes.h: define __no_profile, add to noinstr
  x86, lto: Enable Clang LTO for 32-bit as well
  CFI: Move function_nocfi() into compiler.h
  MAINTAINERS: Add Clang CFI section
This commit is contained in:
Linus Torvalds 2021-06-30 14:33:25 -07:00
commit 44b6ed4cfa
14 changed files with 74 additions and 37 deletions
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10
include/linux/compiler.h
View file

@ -219,6 +219,16 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
__v; \
})
/*
* With CONFIG_CFI_CLANG, the compiler replaces function addresses in
* instrumented C code with jump table addresses. Architectures that
* support CFI can define this macro to return the actual function address
* when needed.
*/
#ifndef function_nocfi
#define function_nocfi(x) (x)
#endif
#endif /* __KERNEL__ */
/*