Messages in this thread | | | From | Andy Lutomirski <> | Date | Fri, 10 Apr 2015 15:30:52 -0700 | Subject | Re: [PATCH v3] checkpatch.pl: New instances of ENOSYS are errors |
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On Fri, Aug 22, 2014 at 11:14 AM, Joe Perches <joe@perches.com> wrote: > On Fri, 2014-08-22 at 11:05 -0700, Andy Lutomirski wrote: >> ENOSYS means that a nonexistent system call was called. We have a >> bad habit of using it for things like invalid operations on >> otherwise valid syscalls. We should avoid this in new code. > > Seems sensible thanks for persisting. > > Andrew Morton is generally the upstream path (cc'd) > >> Signed-off-by: Andy Lutomirski <luto@amacapital.net> >> --- >> >> Pervasive incorrect usage of ENOSYS came up at the kernel summit ABI >> review discussion. Let's see if checkpatch can help. >> >> I'll submit a separate patch for include/uapi/asm-generic/errno.h. >> >> Changes from v2: >> - Reduce severity to WARN. >> - Remove unnecessary clarification. >> - Rebase onto Linus' tree instead of v3.16. >> >> Changes from v1: >> - Moved later so that it won't warn on context lines. >> - Use $herecur. >> - Improve regex pattern. >> >> scripts/checkpatch.pl | 8 ++++++++ >> 1 file changed, 8 insertions(+) >> >> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl >> index 31a731e..448d075 100755 >> --- a/scripts/checkpatch.pl >> +++ b/scripts/checkpatch.pl >> @@ -3214,6 +3214,14 @@ sub process { >> "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\n" . $herecurr); >> } >> >> +# ENOSYS means "bad syscall nr" and nothing else. This will have a small >> +# number of false positives, but assembly files are not checked, so at >> +# least the arch entry code will not trigger this warning. >> + if ($line =~ /\bENOSYS\b/) { >> + WARN("ENOSYS", >> + "ENOSYS means 'invalid syscall nr' and nothing else\n" . $herecurr); >> + } >> + >> # function brace can't be on same line, except for #defines of do while, >> # or if closed on same line >> if (($line=~/$Type\s*$Ident\(.*\).*\s*{/) and > > >
Ping, akpm?
--Andy
-- Andy Lutomirski AMA Capital Management, LLC
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