[patch] add some Blackfin specific checks to checkpatch.pl

[Mike Frysinger <vapier@gentoo.org>]

Check for a few common errors in Blackfin-specific code wrt MMR loading in
assembly and doing core/system syncs.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
CC: Bryan Wu <bryan.wu@analog.com>
CC: Andy Whitcroft <apw@shadowen.org>
---
 scripts/checkpatch.pl |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index dae7d30..ead9675 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -486,9 +486,29 @@ sub process {
 			WARN("line over 80 characters\n" . $herecurr);
 		}
 
+# Blackfin: use hi/lo macros
+		if ($line =~ /\.[lL][[:space:]]*=.*&[[:space:]]*0x[fF][fF][fF][fF]/) {
+			my $herevet = "$here\n" . cat_vet($line) . "\n";
+			ERROR("use the LO() macro, not (... & 0xFFFF)\n" . $herevet);
+		}
+		if ($line =~ /\.[hH][[:space:]]*=.*>>[[:space:]]*16/) {
+			my $herevet = "$here\n" . cat_vet($line) . "\n";
+			ERROR("use the HI() macro, not (... >> 16)\n" . $herevet);
+		}
+
 # check we are in a valid source file *.[hc] if not then ignore this hunk
 		next if ($realfile !~ /\.[hc]$/);
 
+# Blackfin: don't use __builtin_bfin_[cs]sync
+		if ($line =~ /__builtin_bfin_csync/) {
+			my $herevet = "$here\n" . cat_vet($line) . "\n";
+			ERROR("use the CSYNC() macro in asm/blackfin.h\n" . $herevet);
+		}
+		if ($line =~ /__builtin_bfin_ssync/) {
+			my $herevet = "$here\n" . cat_vet($line) . "\n";
+			ERROR("use the SSYNC() macro in asm/blackfin.h\n" . $herevet);
+		}
+
 # at the beginning of a line any tabs must come first and anything
 # more than 8 must use tabs.
 		if ($line=~/^\+\s* \t\s*\S/ or $line=~/^\+\s*        \s*/) {
-- 
1.5.3.rc5