checkpatch: warn on unnecessary else after return or break
Using an else following a break or return can unnecessarily indent code blocks. ie: for (i = 0; i < 100; i++) { int foo = bar(); if (foo < 1) break; else usleep(1); } is generally better written as: for (i = 0; i < 100; i++) { int foo = bar(); if (foo < 1) break; usleep(1); } Warn when a bare else statement is preceded by a break or return indented 1 tab more than the else. Change-Id: I04d1998fde9243b9717a415b239bec63c0f9146f Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Git-commit: 032a4c0f9a77ce565355c6e191553e853ba66f09 Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
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@ -2342,6 +2342,16 @@ sub process {
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# check we are in a valid C source file if not then ignore this hunk
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next if ($realfile !~ /\.(h|c)$/);
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# check indentation of any line with a bare else
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# if the previous line is a break or return and is indented 1 tab more...
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if ($sline =~ /^\+([\t]+)(?:}[ \t]*)?else(?:[ \t]*{)?\s*$/) {
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my $tabs = length($1) + 1;
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if ($prevline =~ /^\+\t{$tabs,$tabs}(?:break|return)\b/) {
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WARN("UNNECESSARY_ELSE",
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"else is not generally useful after a break or return\n" . $hereprev);
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}
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}
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# discourage the addition of CONFIG_EXPERIMENTAL in #if(def).
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if ($line =~ /^\+\s*\#\s*if.*\bCONFIG_EXPERIMENTAL\b/) {
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WARN("CONFIG_EXPERIMENTAL",
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