[PATCH] checkpatch: Add __ro_after_init to known $Attribute

[Joe Perches]

__ro_after_init is a specific __attribute__ that checkpatch
does currently not understand.

Add it to the known $Attribute types so that code that uses
variables declared with __ro_after_init are not thought to
be a modifier type.

This appears as a defect in checkpatch output of code like:

static bool trust_cpu __ro_after_init = IS_ENABLED(CONFIG_RANDOM_TRUST_CPU);
[...]
       if (trust_cpu && arch_init) {

where checkpatch reports:

ERROR: space prohibited after that '&&' (ctx:WxW)
        if (trust_cpu && arch_init) {

Reported-by: Kees Cook <keesc...@chromium.org>
Signed-off-by: Joe Perches <j...@perches.com>
---
 scripts/checkpatch.pl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 5219280bf7ff..23cde9d90278 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -380,6 +380,7 @@ our $Attribute      = qr{
                        __noclone|
                        __deprecated|
                        __read_mostly|
+                       __ro_after_init|
                        __kprobes|
                        $InitAttribute|
                        ____cacheline_aligned|