[PATCH] mm: include swap.h in swapops.h

[Kiryl Shutsemau]

From: "Kiryl Shutsemau (Meta)" <kas@xxxxxxxxxx>

swapops.h uses MAX_SWAPFILES_SHIFT, SWP_MIGRATION_READ and SWP_PTE_MARKER,
all of which swap.h defines, but does not include swap.h.  It compiles only
where the translation unit pulled swap.h in first.  leafops.h includes
swapops.h on the line above swap.h, so a file whose include list reaches
leafops.h before swap.h gets:

    In file included from include/linux/leafops.h:11:
    include/linux/swapops.h:88:21: error: use of undeclared
    identifier 'MAX_SWAPFILES_SHIFT'

A header that uses a definition has to include the header that provides it.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202608181757.mza9RRj7-lkp@xxxxxxxxx/
Signed-off-by: Kiryl Shutsemau (Meta) <kas@xxxxxxxxxx>
---
 include/linux/swapops.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index 1f3ff3b93e16..e7d0d529f3e0 100644
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -5,6 +5,7 @@
 #include <linux/radix-tree.h>
 #include <linux/bug.h>
 #include <linux/mm_types.h>
+#include <linux/swap.h>
 
 #ifdef CONFIG_MMU
 

base-commit: 33f61b12d297562321533c048e034b1fb21c1cf3
-- 
2.54.0