config: fix page_mapping test

It always failed from "unused variable" warnings-errors. The resulting `#define page_mapping(...)` happend to work because it always overrode the kernel's function prototype, but that's brittle. Sponsored-by: https://despairlabs.com/sponsor/ Signed-off-by: Rob Norris <[email protected]>
openzfs · Sep 16, 2024 · 9a73dcf · 9a73dcf
1 parent 50ac073
commit 9a73dcf
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/config/kernel-mm-pagemap.m4 b/config/kernel-mm-pagemap.m4
@@ -21,8 +21,8 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_MM_PAGE_MAPPING], [
 	ZFS_LINUX_TEST_SRC([page_mapping], [
 		#include <linux/pagemap.h>
 	],[
-		struct page *p = NULL;
-		struct address_space *m = page_mapping(NULL);
+		struct address_space *m;
+		m = page_mapping(NULL);
 	])
 ])
 AC_DEFUN([ZFS_AC_KERNEL_MM_PAGE_MAPPING], [