On Mon, Feb 23, 2015 at 07:06:27PM -0800, Joe Perches wrote:
> On Mon, 2015-02-23 at 21:18 +0200, Aya Mahfouz wrote:
> > This patch adds 2 new checks on memset calls in the file
> > checkpatch.pl as follows:
> >
> > 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.
>
> Hello Aya.
>
> Good idea but:
>
> there already is a test for memset at (-next) line 4893.
>
> Please extend that as below instead of adding another test.
>
Hello Joe,
I've adjusted the checks as you requested. Kindly let me know if there
is something else that should be done.
Kind Regards,
Aya Saif El-yazal Mahfouz
> > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> []
> > @@ -4918,6 +4918,25 @@ sub process {
> > }
> > }
> >
> > +# Check for memset(foo, 0x00|0xff, ETH_ALEN) that could be
> > eth_zero_addr(foo)|eth_broadcast_addr(foo)
> > + if ($^V && $^V ge 5.10.0 &&
> > + $line =~
> > /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/s) {
> > + my $num = $7;
> > + if ($num =~ "0x00" && WARN("PREFER_ETH_ZERO_ADDR",
>
> # Check for misused memsets
> if ($^V && $^V ge 5.10.0 &&
> defined $stat &&
> $stat =~
> /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*$FuncArg\s*\)/s) {
>
> my $ms_addr = $2;
> my $ms_val = $7;
> my $ms_size = $12;
>
> if ($ms_val =~ /^(?:0|0x0+)$/i &&
> $ms_size =~ /^ETH_ALEN$/ &&
> WARN("PREFER_ETH_ADDR_FUNC",
> "..." . herecurr) &&
> $fix) {
> $fixed[$fixlinenr] =~
> s/\bmemcpy\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_FUNC",
> "..." . herecurr) &&
> $fix) {
> $fixed[$fixlinenr] =~
> s/\bmemcpy\s*\(\s*\Q$ms_addr\E\s*,\s*\Q$ms_val\E\s*\,\s*ETH_ALEN\s*\)/eth_broadcast_addr($ms_addr)/;
> } elsif (...)
>
>
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