[PATCH] kbuild: fix modpost when used with O=

From: Sam Ravnborg <sam@ravnborg.org>

modpost or to be more specific sumversion.c was not behaving correct when
used with O= and MODULE_VERSION was used.  Previously it failed to use
local .h when calculation the md-sum in case of a O= build.

The following patch introduces the following:

- A generic get_next_line()

- Check that the topmost part of the directory matches

- Using strrch when checking for file with suffix .o

- Use NOFAIL for allocations in sumversion

- Avoid memory leak in new_module

The generic get_next_line will pay off when Andreas implmentation of
storing symbol addresses in a seperate file is introduced.

1 files changed, 4 insertions, 0 deletions

diff --git a/scripts/modpost.h b/scripts/modpost.h
index 2890845dad3e..0b18b4192a63 100644
--- a/scripts/modpost.h
+++ b/scripts/modpost.h
@@ -53,6 +53,9 @@ static inline void __endian(const void *src, void *dest, unsigned int size)
 
 #endif
 
+#define NOFAIL(ptr)   do_nofail((ptr), __FILE__, __LINE__, #ptr)
+void *do_nofail(void *ptr, const char *file, int line, const char *expr);
+
 struct buffer {
 	char *p;
 	int pos;
@@ -95,4 +98,5 @@ void maybe_frob_version(const char *modfilename,
 			unsigned long modinfo_offset);
 
 void *grab_file(const char *filename, unsigned long *size);
+char* get_next_line(unsigned long *pos, void *file, unsigned long size);
 void release_file(void *file, unsigned long size);