+ checkpatch-add-warning-for-avoiding-l-prefix-symbols-in-assembly-files.patch added to -mm tree

+ checkpatch-add-warning-for-avoiding-l-prefix-symbols-in-assembly-files.patch added to -mm tree

[akpm]

The patch titled
     Subject: checkpatch: add warning for avoiding .L prefix symbols in assembly files
has been added to the -mm tree.  Its filename is
     checkpatch-add-warning-for-avoiding-l-prefix-symbols-in-assembly-files.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/checkpatch-add-warning-for-avoiding-l-prefix-symbols-in-assembly-files.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/checkpatch-add-warning-for-avoiding-l-prefix-symbols-in-assembly-files.patch

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------------------------------------------------------
From: Aditya Srivastava <yashsri421@gmail.com>
Subject: checkpatch: add warning for avoiding .L prefix symbols in assembly files

objtool requires that all code must be contained in an ELF symbol.  Symbol
names that have a '.L' prefix do not emit symbol table entries, as they
have special meaning for the assembler.

'.L' prefixed symbols can be used within a code region, but should be
avoided for denoting a range of code via 'SYM_*_START/END' annotations.

Add a new check to emit a warning on finding the usage of '.L' symbols for
'.S' files, if it denotes range of code via SYM_*_START/END annotation
pair.

Link: https://lkml.kernel.org/r/20210123190459.9701-1-yashsri421@gmail.com
Link: https://lore.kernel.org/lkml/20210112210154.GI4646@sirena.org.uk
Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
Suggested-by: Mark Brown <broonie@kernel.org>
Acked-by: Joe Perches <joe@perches.com>
Cc: Aditya Srivastava <yashsri421@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 scripts/checkpatch.pl |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/scripts/checkpatch.pl~checkpatch-add-warning-for-avoiding-l-prefix-symbols-in-assembly-files
+++ a/scripts/checkpatch.pl
@@ -3606,6 +3606,13 @@ sub process {
 			}
 		}
 
+# check for .L prefix local symbols in .S files
+		if ($realfile =~ /\.S$/ &&
+		    $line =~ /^\+\s*(?:[A-Z]+_)?SYM_[A-Z]+_(?:START|END)(?:_[A-Z_]+)?\s*\(\s*\.L/) {
+			WARN("AVOID_L_PREFIX",
+			     "Avoid using '.L' prefixed local symbol names for denoting a range of code via 'SYM_*_START/END' annotations; see Documentation/asm-annotations.rst\n" . $herecurr);
+		}
+
 # check we are in a valid source file C or perl if not then ignore this hunk
 		next if ($realfile !~ /\.(h|c|pl|dtsi|dts)$/);
 
_

Patches currently in -mm which might be from yashsri421@gmail.com are

checkpatch-add-warning-for-avoiding-l-prefix-symbols-in-assembly-files.patch