Messages in this thread | | | Subject | Re: [PATCH v3] scripts: checkpatch.pl: add 2 new checks on memset | From | Joe Perches <> | Date | Sun, 01 Mar 2015 14:13:21 -0800 |
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On Sun, 2015-03-01 at 23:43 +0200, Aya Mahfouz wrote: > calls > Reply-To: > > Add 2 new checks on memset calls in the file checkpatch.pl as follows:
Hi again Aya
The initial 3 lines here aren't necessary.
I think it'd be a better subject line with something like "checkpatch: prefer eth_<foo>_addr over memset(,,ETH_ALEN)"
Please cc Andrew Morton <akpm@linux-foundation.org> And please also don't add Signed-off-by: lines for anyone other than yourself.
Other than those things: Acked-by: Joe Perches <joe@perches.com>
> replace memset by eth_zero_addr if the second argument is > an address of zeros (0x00). eth_zero_addr is a wrapper function > for memset that takes an address array to set as zero. The size > address has to be ETH_ALEN. > > replace memset by eth_broadcast_addr if the second argument is > the broadcast address (0xff). eth_broadcast_addr is a wrapper > function for memset that sets the passed array the broadcast > address. The size of the address has to be ETH_ALEN. > > In addition, the regex assigned to the variable $stat has been > restricted to handle memset function calls of the form: > [<identifer> =]* memset(<arg1>, <arg2>, <arg3>) > > Cc: Julia Lawall <julia.lawall@lip6.fr> > Signed-off-by: Aya Mahfouz <mahfouz.saif.elyazal@gmail.com> > Signed-off-by: Joe Perches <joe@perches.com> > --- > v2: adjusted all checks on memset calls to be in one body > v3: adjusted all regular expressions per Joe Perches suggestions. Added > a Signed-off-by tag for Joe since all the important regular expressions > are written by him. > > scripts/checkpatch.pl | 17 +++++++++++++++-- > 1 file changed, 15 insertions(+), 2 deletions(-) > > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl > index d124359..cbe973e 100755 > --- a/scripts/checkpatch.pl > +++ b/scripts/checkpatch.pl > @@ -4890,10 +4890,11 @@ sub process { > } > } > > -# Check for misused memsets > +# Check for misused memsets then check for memset(foo, 0x00|0xff, ETH_ALEN) > +# calls that could be eth_zero_addr(foo)|eth_broadcast_addr(foo) > if ($^V && $^V ge 5.10.0 && > defined $stat && > - $stat =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) { > + $stat =~ /^\+(?:\s*$Ident\s*=)?\s*memset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) { > > my $ms_addr = $2; > my $ms_val = $7; > @@ -4905,6 +4906,18 @@ sub process { > } elsif ($ms_size =~ /^(0x|)1$/i) { > WARN("MEMSET", > "single byte memset is suspicious. Swapped 2nd/3rd argument?\n" . "$here\n$stat\n"); > + } elsif ($ms_val =~ /^(?:0x)?0+$/i && > + $ms_size =~ /^ETH_ALEN$/ && > + WARN("PREFER_ETH_ADDR", > + "Prefer eth_zero_addr() over memset() if the second address is 0\n" . $herecurr) && > + $fix) { > + $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*\Q$ms_addr\E\s*,\s*\Q$ms_val\E\s*,\s*ETH_ALEN\s*\)/eth_zero_addr($ms_addr)/; > + } elsif ($ms_val =~ /^(?:0xff|255)$/i && > + $ms_size =~ /^ETH_ALEN$/ && > + WARN("PREFER_ETH_ADDR", > + "Prefer eth_broadcast_addr() over memset() if the second address is 0xff\n" . $herecurr) && > + $fix) { > + $fixed[$fixlinenr] =~ s/\bmemset\s*\(\s*\Q$ms_addr\E\s*,\s*\Q$ms_val\E\s*,\s*ETH_ALEN\s*\)/eth_broadcast_addr($ms_addr)/; > } > } > > -- > 1.9.3 > >
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