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| author | David Hildenbrand <david@redhat.com> | 2022-09-23 13:34:25 +0200 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2022-09-29 21:20:53 +0200 |
| commit | 69d517e6e21099f81efbd39e47874649ae575804 (patch) | |
| tree | 86d52da45f0ef03171422a8fe18cbe5466642d74 /scripts/checkpatch.pl | |
| parent | coding-style.rst: document BUG() and WARN() rules ("do not crash the kernel") (diff) | |
| download | linux-69d517e6e21099f81efbd39e47874649ae575804.tar.xz linux-69d517e6e21099f81efbd39e47874649ae575804.zip | |
checkpatch: warn on usage of VM_BUG_ON() and other BUG variants
checkpatch does not point out that VM_BUG_ON() and friends should be
avoided, however, Linus notes:
VM_BUG_ON() has the exact same semantics as BUG_ON. It is literally
no different, the only difference is "we can make the code smaller
because these are less important". [1]
So let's warn on VM_BUG_ON() and other BUG variants as well. While at it,
make it clearer that the kernel really shouldn't be crashed.
As there are some subsystem BUG macros that actually don't end up crashing
the kernel -- for example, KVM_BUG_ON() -- exclude these manually.
[1] https://lore.kernel.org/r/CAHk-=wg40EAZofO16Eviaj7mfqDhZ2gVEbvfsMf6gYzspRjYvw@mail.gmail.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20220923113426.52871-3-david@redhat.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to '')
| -rwxr-xr-x | scripts/checkpatch.pl | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index 812af52f97d2..4aa09e0cb86a 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -4695,12 +4695,12 @@ sub process { } } -# avoid BUG() or BUG_ON() - if ($line =~ /\b(?:BUG|BUG_ON)\b/) { +# do not use BUG() or variants + if ($line =~ /\b(?!AA_|BUILD_|DCCP_|IDA_|KVM_|RWLOCK_|snd_|SPIN_)(?:[a-zA-Z_]*_)?BUG(?:_ON)?(?:_[A-Z_]+)?\s*\(/) { my $msg_level = \&WARN; $msg_level = \&CHK if ($file); &{$msg_level}("AVOID_BUG", - "Avoid crashing the kernel - try using WARN_ON & recovery code rather than BUG() or BUG_ON()\n" . $herecurr); + "Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants\n" . $herecurr); } # avoid LINUX_VERSION_CODE |