[Qemu-devel] [PATCH] checkpatch: Supress warning in function pointer typedefs

[Vinzenz 'evilissimo' Feenstra <vfeenstr@redhat.com>]

From: Vinzenz Feenstra <vfeenstr@redhat.com>

When importing dynamically functions via `GetProcAddress` in windows
related code, it is quite common to make a typedef for the resulting
function pointer. When the function to be imported, has a stdcall
calling convention, usually the `WINAPI` macro is used. This patch adds an
exception in the checkpatch.pl script to allow the calling convention
specification in function pointer typedefs, to be `WINAPI`.

Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com>
---
 scripts/checkpatch.pl | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f084542..33bf585 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1774,7 +1774,14 @@ sub process {
 			# likely a typedef for a function.
 			} elsif ($ctx =~ /$Type$/) {
 
-			} else {
+            # If this is a typedef we need to allow WINAPI as a calling
+            # convention. Even though there should be only one space around the
+            # star, we allow none or any, to suppress the following warning.
+            # The check for the number of spaces around the star is checked
+            # elsewhere.
+			} elsif($ctx =~ /^\s*typedef\s+$Type\(WINAPI\s*\*\s*$Ident\)/) {
+
+            } else {
 				ERROR("space prohibited between function name and open parenthesis '('\n" . $herecurr);
 			}
 		}
-- 
2.9.3