make asm-x86_64/atomic.S build on FreeBSD

[mattmacy]

Signed-off-by: Matt Macy [email protected]

Motivation and Context

Description

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the ZFS on Linux code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• All commit messages are properly formatted and contain Signed-off-by.

[codecov]

Codecov Report

Merging #9634 into master will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #9634     +/-   ##
=========================================
- Coverage   79.37%   79.28%   -0.1%     
=========================================
  Files         418      418             
  Lines      123531   123531             
=========================================
- Hits        98057    97943    -114     
- Misses      25474    25588    +114

Flag	Coverage Δ
#kernel	79.86% <ø> (-0.06%)	⬇️
#user	66.93% <ø> (-0.37%)	⬇️

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[lundman]

This is fine by me, but the asmlinkage.h file comes back a lot with the fletcher/raidz vectorized code (similarly simd_x86.h), perhaps we could consider a spl/include file we use universally, which lives in platform directory. Or not, only like 5 of them, guess I remember it worse :)

[behlendorf]

perhaps we could consider a spl/include file we use universally

Sounds like a good idea to me. There's a lot of stuff in the asm_linkage.h we pulled from illumos and might be nice to to trim it down to what's actually needed. But I think we should leave that for a future PR.