linux/arch/x86
Nick Desaulniers a9c640ac96 x86/boot: Restrict header scope to make Clang happy
The inclusion of <linux/kernel.h> was causing issue as the definition of
__arch_hweight64 from arch/x86/include/asm/arch_hweight.h eventually gets
included. The definition is problematic when compiled with -m16 (all code
in arch/x86/boot/ is) as the "D" inline assembly constraint is rejected
by both compilers when passed an argument of type long long (regardless
of signedness, anything smaller is fine).

Because GCC performs inlining before semantic analysis, and
__arch_hweight64 is dead in this translation unit, GCC does not report
any issues at compile time.  Clang does the semantic analysis in the
front end, before inlining (run in the middle) can determine the code is
dead. I consider this another case of PR33587, which I think we can do
more work to solve.

It turns out that arch/x86/boot/string.c doesn't actually need
linux/kernel.h, simply linux/limits.h and linux/compiler.h.

Suggested-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Cc: bp@alien8.de
Cc: niravd@google.com
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Chao Fan <fanc.fnst@cn.fujitsu.com>
Cc: Uros Bizjak <ubizjak@gmail.com>
Link: https://bugs.llvm.org/show_bug.cgi?id=33587
Link: https://github.com/ClangBuiltLinux/linux/issues/347
Link: https://lkml.kernel.org/r/20190314221458.83047-1-ndesaulniers@google.com
2019-03-21 12:24:38 +01:00
..
boot x86/boot: Restrict header scope to make Clang happy 2019-03-21 12:24:38 +01:00
configs Merge branch 'akpm' (patches from Andrew) 2019-03-07 19:25:37 -08:00
crypto crypto: x86/poly1305 - Clear key material from stack in SSE2 variant 2019-02-28 14:17:59 +08:00
entry pidfd patches for v5.1-rc1 2019-03-16 13:47:14 -07:00
events perf/x86/intel: Make dev_attr_allow_tsx_force_abort static 2019-03-17 08:40:18 +01:00
hyperv Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-03-10 14:46:56 -07:00
ia32 a.out: remove core dumping support 2019-03-05 10:00:35 -08:00
include Kbuild updates for v5.1 (2nd) 2019-03-17 13:25:26 -07:00
kernel x86/mm: Don't leak kernel addresses 2019-03-19 12:10:56 +01:00
kvm ARM: some cleanups, direct physical timer assignment, cache sanitization 2019-03-15 15:00:28 -07:00
lib Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-03-07 16:36:57 -08:00
math-emu Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
mm memblock: drop memblock_alloc_*_nopanic() variants 2019-03-12 10:04:02 -07:00
net x32: bpf: implement jitting of JMP32 2019-01-26 13:33:02 -08:00
oprofile
pci x86/PCI: Fixup RTIT_BAR of Intel Denverton Trace Hub 2019-02-07 08:43:58 -06:00
platform treewide: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
power mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
purgatory
ras
realmode Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
tools x86: Clean up 'sizeof x' => 'sizeof(x)' 2018-10-29 07:13:28 +01:00
um Merge branch 'timers-2038-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-03-05 14:08:26 -08:00
video
xen Merge branch 'akpm' (patches from Andrew) 2019-03-12 10:39:53 -07:00
.gitignore
Kbuild KVM: x86: Allow Qemu/KVM to use PVH entry point 2018-12-13 13:41:49 -05:00
Kconfig DMA mapping updates for 5.1 2019-03-10 11:54:48 -07:00
Kconfig.cpu x86/cpu: Create Hygon Dhyana architecture support file 2018-09-27 16:14:05 +02:00
Kconfig.debug efi/x86: Convert x86 EFI earlyprintk into generic earlycon implementation 2019-02-04 08:27:30 +01:00
Makefile Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-03-07 17:09:28 -08:00
Makefile_32.cpu
Makefile.um x86, powerpc: Remove -funit-at-a-time compiler option entirely 2018-12-09 11:55:32 +01:00