checkpatch: Remove ACCESS_ONCE() warning

Now that ACCESS_ONCE() has been excised from the kernel, any uses will
result in a build error, and we no longer need to whine about it in
checkpatch.

This patch removes the newly redundant warning.

Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@redhat.com
Link: http://lkml.kernel.org/r/20171127103824.36526-5-mark.rutland@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 040aa79..31031f1 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6233,28 +6233,6 @@ sub process {
                        }
                }
 
-# whine about ACCESS_ONCE
-               if ($^V && $^V ge 5.10.0 &&
-                   $line =~ /\bACCESS_ONCE\s*$balanced_parens\s*(=(?!=))?\s*($FuncArg)?/) {
-                       my $par = $1;
-                       my $eq = $2;
-                       my $fun = $3;
-                       $par =~ s/^\(\s*(.*)\s*\)$/$1/;
-                       if (defined($eq)) {
-                               if (WARN("PREFER_WRITE_ONCE",
-                                        "Prefer WRITE_ONCE(<FOO>, <BAR>) over ACCESS_ONCE(<FOO>) = <BAR>\n" . $herecurr) &&
-                                   $fix) {
-                                       $fixed[$fixlinenr] =~ s/\bACCESS_ONCE\s*\(\s*\Q$par\E\s*\)\s*$eq\s*\Q$fun\E/WRITE_ONCE($par, $fun)/;
-                               }
-                       } else {
-                               if (WARN("PREFER_READ_ONCE",
-                                        "Prefer READ_ONCE(<FOO>) over ACCESS_ONCE(<FOO>)\n" . $herecurr) &&
-                                   $fix) {
-                                       $fixed[$fixlinenr] =~ s/\bACCESS_ONCE\s*\(\s*\Q$par\E\s*\)/READ_ONCE($par)/;
-                               }
-                       }
-               }
-
 # check for mutex_trylock_recursive usage
                if ($line =~ /mutex_trylock_recursive/) {
                        ERROR("LOCKING",