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config: fix page_mapping test

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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/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #16479
This commit is contained in:
Rob Norris 2024-09-16 11:11:29 +10:00 committed by Tony Hutter
parent 3894844b62
commit 05aeaca7de
1 changed files with 2 additions and 2 deletions
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4
config/kernel-mm-pagemap.m4
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@ -21,8 +21,8 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_MM_PAGE_MAPPING], [
ZFS_LINUX_TEST_SRC([page_mapping], [ ZFS_LINUX_TEST_SRC([page_mapping], [
#include <linux/pagemap.h> #include <linux/pagemap.h>
],[ ],[
struct page *p = NULL; struct address_space *m;
struct address_space *m = page_mapping(NULL); m = page_mapping(NULL);
]) ])
]) ])
AC_DEFUN([ZFS_AC_KERNEL_MM_PAGE_MAPPING], [ AC_DEFUN([ZFS_AC_KERNEL_MM_PAGE_MAPPING], [