kernel-doc: bugfix - multi-line macros

Prior to this patch the following code breaks:

/**
 * multiline_example - this breaks kernel-doc
 */
 #define multiline_example( \
myparam)

Producing this error:

Error(somefile.h:983): cannot understand prototype: 'multiline_example( \ '

This patch fixes the issue by appending all lines ending in a blackslash
(optionally followed by whitespace), removing the backslash and any
whitespace after it prior to appending (just like the C pre-processor
would).

This fixes a break in kerel-doc introduced by the additions to rbtree.h.

Signed-off-by: Daniel Santos <daniel.santos@pobox.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 8fd107a3fac4..2dea5f81baef 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -2046,6 +2046,9 @@ sub process_file($) {
 
     $section_counter = 0;
     while (<IN>) {
+        while (s/\\\s*$//) {
+            $_ .= <IN>;
+        }
         if ($state == 0) {
             if (/$doc_start/o) {
                 $state = 1;             # next line is always the function name