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checkpatch: complain about ffs(3) calls

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The ffs(3) family of functions is not portable.  MinGW doesn't always
provide the function.

Use ctz32() or ctz64() instead.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1427124571-28598-10-git-send-email-stefanha@redhat.com
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2015-03-23 15:29:31 +00:00 committed by Kevin Wolf
parent f450a85899
commit 8b6ee9aeb3
1 changed files with 11 additions and 0 deletions
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11
scripts/checkpatch.pl
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@ -2911,6 +2911,17 @@ sub process {
if ($rawline =~ /\b(?:Qemu|QEmu)\b/) {
WARN("use QEMU instead of Qemu or QEmu\n" . $herecurr);
}
# check for non-portable ffs() calls that have portable alternatives in QEMU
if ($line =~ /\bffs\(/) {
ERROR("use ctz32() instead of ffs()\n" . $herecurr);
}
if ($line =~ /\bffsl\(/) {
ERROR("use ctz32() or ctz64() instead of ffsl()\n" . $herecurr);
}
if ($line =~ /\bffsll\(/) {
ERROR("use ctz64() instead of ffsll()\n" . $herecurr);
}
}
# If we have no input at all, then there is nothing to report on