CONFIG_IS_ENABLED() takes the kconfig name without the CONFIG_ prefix,
e.g. CONFIG_IS_ENABLED(CLK) for CONFIG_CLK. Make including the prefix
an error in checkpatch.pl so calls in the wrong format aren't
accidentally reintroduced.

Signed-off-by: Alper Nebi Yasak <alpernebiya...@gmail.com>
---

 scripts/checkpatch.pl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 4bed2b0cdc..4ed7e124c9 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2365,6 +2365,12 @@ sub u_boot_line {
                ERROR("DISABLE_FDT_OR_INITRD_RELOC",
                     "fdt or initrd relocation disabled at boot time\n" . 
$herecurr);
        }
+
+       # Do not use CONFIG_ prefix in CONFIG_IS_ENABLED() calls
+       if ($line =~ /^\+.*CONFIG_IS_ENABLED\(CONFIG_\w*\).*/) {
+               ERROR("CONFIG_IS_ENABLED_CONFIG",
+                     "CONFIG_IS_ENABLED() takes values without the CONFIG_ 
prefix\n" . $herecurr);
+       }
 }
 
 sub process {
-- 
2.28.0

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