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lint/checkpatch: Add a check for use of self-assignments

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This reduce the difference with linux v5.19-rc7.

Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Change-Id: If47a7826ee67a2be25a4caa2a447484e5f11411b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65836
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@tutanota.com>
This commit is contained in:
Elyes Haouas
2022-07-13 18:03:47 +02:00
committed by Martin L Roth
parent e83e090b05
commit f9a3554a4a
1 changed files with 11 additions and 0 deletions
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11
util/lint/checkpatch.pl
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@@ -4027,6 +4027,17 @@ sub process {
#ignore lines not being added
next if ($line =~ /^[^\+]/);
# check for self assignments used to avoid compiler warnings
# e.g.: int foo = foo, *bar = NULL;
# struct foo bar = *(&(bar));
if ($line =~ /^\+\s*(?:$Declare)?([A-Za-z_][A-Za-z\d_]*)\s*=/) {
my $var = $1;
if ($line =~ /^\+\s*(?:$Declare)?$var\s*=\s*(?:$var|\*\s*\(?\s*&\s*\(?\s*$var\s*\)?\s*\)?)\s*[;,]/) {
WARN("SELF_ASSIGNMENT",
"Do not use self-assignments to avoid compiler warnings\n" . $herecurr);
}
}
# check for dereferences that span multiple lines
if ($prevline =~ /^\+.*$Lval\s*(?:\.|->)\s*$/ &&
$line =~ /^\+\s*(?!\#\s*(?!define\s+|if))\s*$Lval/) {