Re: [PATCH 0/7] LLVM: make x86_64 kernel build with clang.

[Dmitry Vyukov]

On Fri, Mar 17, 2017 at 1:15 AM, Michael Davidson  wrote:
> This patch set is sufficient to get the x86_64 kernel to build
> and boot correctly with clang-3.8 or greater.
>
> The resulting build still has about 300 warnings, very few of
> which appear to be significant. Most of them should be fixable
> with some minor code refactoring although a few of them, such
> as the complaints about implict conversions between enumerated
> types may be candidates for just being disabled.

Thanks, Michael!
This will help us a lot with KMSAN (uninit use detector) and code coverage.


> Michael Davidson (7):
>   Makefile, LLVM: add -no-integrated-as to KBUILD_[AC]FLAGS
>   Makefile, x86, LLVM: disable unsupported optimization flags
>   x86, LLVM: suppress clang warnings about unaligned accesses
>   x86, boot, LLVM: #undef memcpy etc in string.c
>   x86, boot, LLVM: Use regparm=0 for memcpy and memset
>   md/raid10, LLVM: get rid of variable length array
>   crypto, x86, LLVM: aesni - fix token pasting
>
>  Makefile|  4 
>  arch/x86/Makefile   |  7 +++
>  arch/x86/boot/copy.S| 15 +--
>  arch/x86/boot/string.c  |  9 +
>  arch/x86/boot/string.h  | 13 +
>  arch/x86/crypto/aes_ctrby8_avx-x86_64.S |  7 ++-
>  drivers/md/raid10.c |  9 -
>  7 files changed, 52 insertions(+), 12 deletions(-)
>
> --
> 2.12.0.367.g23dc2f6d3c-goog
>

[PATCH 0/7] LLVM: make x86_64 kernel build with clang.

[Michael Davidson]

This patch set is sufficient to get the x86_64 kernel to build
and boot correctly with clang-3.8 or greater.

The resulting build still has about 300 warnings, very few of
which appear to be significant. Most of them should be fixable
with some minor code refactoring although a few of them, such
as the complaints about implict conversions between enumerated
types may be candidates for just being disabled.

Michael Davidson (7):
  Makefile, LLVM: add -no-integrated-as to KBUILD_[AC]FLAGS
  Makefile, x86, LLVM: disable unsupported optimization flags
  x86, LLVM: suppress clang warnings about unaligned accesses
  x86, boot, LLVM: #undef memcpy etc in string.c
  x86, boot, LLVM: Use regparm=0 for memcpy and memset
  md/raid10, LLVM: get rid of variable length array
  crypto, x86, LLVM: aesni - fix token pasting

 Makefile|  4 
 arch/x86/Makefile   |  7 +++
 arch/x86/boot/copy.S| 15 +--
 arch/x86/boot/string.c  |  9 +
 arch/x86/boot/string.h  | 13 +
 arch/x86/crypto/aes_ctrby8_avx-x86_64.S |  7 ++-
 drivers/md/raid10.c |  9 -
 7 files changed, 52 insertions(+), 12 deletions(-)

-- 
2.12.0.367.g23dc2f6d3c-goog