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Subject[RFC][PATCH 02/13] mm/vmscan: move RECLAIM* bits to uapi header
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From: Dave Hansen <dave.hansen@linux.intel.com>

It is currently not obvious that the RECLAIM_* bits are part of the
uapi since they are defined in vmscan.c. Move them to a uapi header
to make it obvious.

This should have no functional impact.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Ben Widawsky <ben.widawsky@intel.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Daniel Wagner <dwagner@suse.de>
Cc: "Tobin C. Harding" <tobin@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Qian Cai <cai@lca.pw>
Cc: Daniel Wagner <dwagner@suse.de>
Cc: osalvador <osalvador@suse.de>

--

Note: This is not cc'd to stable. It does not fix any bugs.
---

b/include/uapi/linux/mempolicy.h | 7 +++++++
b/mm/vmscan.c | 8 --------
2 files changed, 7 insertions(+), 8 deletions(-)

diff -puN include/uapi/linux/mempolicy.h~mm-vmscan-move-RECLAIM-bits-to-uapi include/uapi/linux/mempolicy.h
--- a/include/uapi/linux/mempolicy.h~mm-vmscan-move-RECLAIM-bits-to-uapi 2021-01-25 16:23:07.197866715 -0800
+++ b/include/uapi/linux/mempolicy.h 2021-01-25 16:23:07.203866715 -0800
@@ -62,5 +62,12 @@ enum {
#define MPOL_F_MOF (1 << 3) /* this policy wants migrate on fault */
#define MPOL_F_MORON (1 << 4) /* Migrate On protnone Reference On Node */

+/*
+ * These bit locations are exposed in the vm.zone_reclaim_mode sysctl
+ * ABI. New bits are OK, but existing bits can never change.
+ */
+#define RECLAIM_ZONE (1<<0) /* Run shrink_inactive_list on the zone */
+#define RECLAIM_WRITE (1<<1) /* Writeout pages during reclaim */
+#define RECLAIM_UNMAP (1<<2) /* Unmap pages during reclaim */

#endif /* _UAPI_LINUX_MEMPOLICY_H */
diff -puN mm/vmscan.c~mm-vmscan-move-RECLAIM-bits-to-uapi mm/vmscan.c
--- a/mm/vmscan.c~mm-vmscan-move-RECLAIM-bits-to-uapi 2021-01-25 16:23:07.199866715 -0800
+++ b/mm/vmscan.c 2021-01-25 16:23:07.204866715 -0800
@@ -4087,14 +4087,6 @@ module_init(kswapd_init)
int node_reclaim_mode __read_mostly;

/*
- * These bit locations are exposed in the vm.zone_reclaim_mode sysctl
- * ABI. New bits are OK, but existing bits can never change.
- */
-#define RECLAIM_ZONE (1<<0) /* Run shrink_inactive_list on the zone */
-#define RECLAIM_WRITE (1<<1) /* Writeout pages during reclaim */
-#define RECLAIM_UNMAP (1<<2) /* Unmap pages during reclaim */
-
-/*
* Priority for NODE_RECLAIM. This determines the fraction of pages
* of a node considered for each zone_reclaim. 4 scans 1/16th of
* a zone.
_
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