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Use fallthrough macro #12441

Merged
merged 1 commit into from
Sep 14, 2021
Merged

Use fallthrough macro #12441

merged 1 commit into from
Sep 14, 2021

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behlendorf
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@behlendorf behlendorf commented Jul 27, 2021 •
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Motivation and Context

When compiling on Fedora 33 with the 5.14-rc2 kernel the
-Wimplicit-fallthrough option is enabled by default resulting
in multiple compiler warnings.

Description

As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to annotate all intentional fallthrough paths. Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will become the kernel default. To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

How Has This Been Tested?

Verified not warnings are printed for both a production and debug
build of OpenZFS when compiled with -Wimplicit-fallthrough.

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)
  • Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
  • Documentation (a change to man pages or other documentation)

Checklist:

@behlendorf behlendorf added the Status: Code Review Needed Ready for review and testing label Jul 27, 2021
@behlendorf behlendorf added Status: Work in Progress Not yet ready for general review and removed Status: Code Review Needed Ready for review and testing labels Jul 29, 2021
@behlendorf
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It looks like I've got a couple build failures here I'll work through when I get a chance.

@behlendorf behlendorf force-pushed the fallthrough branch 10 times, most recently from 5b49bec to 153ce29 Compare September 10, 2021 22:49
@behlendorf
Use fallthrough macro
82edadc 
As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to anotate all intentional fallthrough paths.  Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will because the default.  To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
@behlendorf behlendorf added Status: Code Review Needed Ready for review and testing Type: Building Indicates an issue related to building binaries Status: Accepted Ready to integrate (reviewed, tested) and removed Status: Work in Progress Not yet ready for general review Status: Code Review Needed Ready for review and testing labels Sep 13, 2021
@tonynguien tonynguien merged commit 6954c22 into openzfs:master Sep 14, 2021
rincebrain pushed a commit to rincebrain/zfs that referenced this pull request Sep 22, 2021
@behlendorf @rincebrain
Use fallthrough macro
b9948c0 
As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to anotate all intentional fallthrough paths.  Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will because the default.  To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#12441
rincebrain pushed a commit to rincebrain/zfs that referenced this pull request Oct 22, 2021
@behlendorf @rincebrain
Use fallthrough macro
2a75bb3 
As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to anotate all intentional fallthrough paths.  Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will because the default.  To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#12441
rincebrain pushed a commit to rincebrain/zfs that referenced this pull request Oct 22, 2021
@behlendorf @rincebrain
Use fallthrough macro
8abfddb 
As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to anotate all intentional fallthrough paths.  Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will because the default.  To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#12441
rincebrain pushed a commit to rincebrain/zfs that referenced this pull request Oct 23, 2021
@behlendorf @rincebrain
Use fallthrough macro
6b8cd26 
As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to anotate all intentional fallthrough paths.  Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will because the default.  To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#12441
rincebrain pushed a commit to rincebrain/zfs that referenced this pull request Oct 24, 2021
@behlendorf @rincebrain
Use fallthrough macro
254c87d 
As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to anotate all intentional fallthrough paths.  Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will because the default.  To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#12441
rincebrain pushed a commit to rincebrain/zfs that referenced this pull request Nov 1, 2021
@behlendorf @rincebrain
Use fallthrough macro
3fcd619 
As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to anotate all intentional fallthrough paths.  Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will because the default.  To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#12441
tonyhutter pushed a commit that referenced this pull request Nov 1, 2021
@behlendorf @tonyhutter
Use fallthrough macro
38cf8c0 
As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to anotate all intentional fallthrough paths.  Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will because the default.  To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #12441
tonyhutter pushed a commit that referenced this pull request Nov 2, 2021
@behlendorf @tonyhutter
Use fallthrough macro
143476c 
As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to anotate all intentional fallthrough paths.  Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will because the default.  To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #12441
ghost pushed a commit to truenas/zfs that referenced this pull request Nov 3, 2021
@behlendorf
Use fallthrough macro
e24b885 
As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to anotate all intentional fallthrough paths.  Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will because the default.  To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#12441
tonyhutter pushed a commit to tonyhutter/zfs that referenced this pull request Nov 13, 2021
@behlendorf @tonyhutter
Use fallthrough macro
820c957 
As of the Linux 5.9 kernel a fallthrough macro has been added which
should be used to anotate all intentional fallthrough paths.  Once
all of the kernel code paths have been updated to use fallthrough
the -Wimplicit-fallthrough option will because the default.  To
avoid warnings in the OpenZFS code base when this happens apply
the fallthrough macro.

Additional reading: https://lwn.net/Articles/794944/

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#12441
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@gmelikov gmelikov gmelikov approved these changes

@tonynguien tonynguien tonynguien approved these changes

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