Re: [tip:x86/headers] x86/headers: Remove <asm/sigcontext.h> references on the kernel side

[Mikko Rapeli <mikko.rapeli@iki.fi>]

Hi,

Tested these changes on top of my uapi headers fix branch and
they compile without problems in userspace and thus fix the original issue.

Also abi-compliance-checker reports that these changes don't break anything
in i386 ABI (details at [2]):

"Test Info
Library Name	kernel
Version #1	headers_test_v04
Version #2	headers_test_v04+test_ingo_x86_cleanup
CPU Type	x86
GCC Version	5.2.1
Subject	Binary Compatibility
Test Results
Total Header Files	767
Total Shared Libraries	0 (not analyzed)
Total Symbols / Types	62 / 67
Verdict	Compatible"

or API:

"Test Info
Library Name	kernel
Version #1	headers_test_v04
Version #2	headers_test_v04+test_ingo_x86_cleanup
CPU Type	x86
GCC Version	5.2.1
Subject	Source Compatibility
Test Results
Total Header Files	767
Total Shared Libraries	0 (not analyzed)
Total Symbols / Types	96 / 101
Verdict	Compatible"

While abi-compliance-checker is still quite broken with kernel header files[3]
addition of new constants was correctly detected:

"Other Changes in Constants (3)
sigcontext.h
[−] _fpstate
	Change	Effect
1	The constant _fpstate with value _fpstate_32 has been added.	No effect.

[−] _fpstate_ia32
	Change	Effect
1	The constant _fpstate_ia32 with value _fpstate_32 has been added.	No effect.

[−] sigcontext_ia32
	Change	Effect
1	The constant sigcontext_ia32 with value sigcontext_32 has been added.	No effect."

So for 32 bit userspace side

Tested-by: Mikko Rapeli <mikko.rapeli@iki.fi>

-Mikko

[1] http://lvc.github.io/abi-compliance-checker/

[2] API/ABI check results
    https://mcfrisk.kapsi.fi/temp/headers_test_v04_to_headers_test_v04+test_ingo_x86_cleanup/

[3] abi checker still has some issues with kernel headers:
    https://mcfrisk.kapsi.fi/temp/headers_test_v04+test_ingo_x86_cleanup/log.txt