ZTS: FreeBSD does have a l2arc.trim_ahead tunable

[ghost]

Signed-off-by: Ryan Moeller ryan@iXsystems.com

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.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[codecov]

Codecov Report

Merging #10633 into master will decrease coverage by 0.30%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10633      +/-   ##
==========================================
- Coverage   79.55%   79.25%   -0.31%     
==========================================
  Files         394      394              
  Lines      124641   124641              
==========================================
- Hits        99164    98782     -382     
- Misses      25477    25859     +382     

Flag	Coverage Δ
#kernel	80.14% <ø> (-0.29%)	⬇️
#user	63.73% <ø> (-1.46%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
module/os/linux/spl/spl-zlib.c	55.35% <0.00%> (-28.58%)	⬇️
module/zcommon/zfs_fletcher.c	68.09% <0.00%> (-10.20%)	⬇️
module/os/linux/spl/spl-kmem-cache.c	78.52% <0.00%> (-8.95%)	⬇️
cmd/ztest/ztest.c	69.21% <0.00%> (-6.55%)	⬇️
cmd/zvol_id/zvol_id_main.c	76.31% <0.00%> (-5.27%)	⬇️
module/zfs/bptree.c	88.54% <0.00%> (-5.21%)	⬇️
module/os/linux/zfs/arc_os.c	59.50% <0.00%> (-4.96%)	⬇️
module/zcommon/zfs_fletcher_superscalar.c	97.05% <0.00%> (-2.95%)	⬇️
module/zfs/zio_compress.c	89.74% <0.00%> (-2.57%)	⬇️
module/zfs/vdev_indirect.c	72.50% <0.00%> (-2.17%)	⬇️
... and 51 more

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