[RFC PATCH 2/7] mm/damon/paddr: export damon_pa_* ops for IBS module

[Ravi Jonnalagadda]

Remove static qualifier from damon_pa_prepare_access_checks,
damon_pa_check_accesses, damon_pa_apply_probes, damon_pa_apply_scheme,
and damon_pa_scheme_score. Add EXPORT_SYMBOL_GPL for each.

These functions are used as ops callbacks by the IBS backend module (damon_ibs.ko)
which registers paddr_ibs operations.

Signed-off-by: Ravi Jonnalagadda <ravis.opensrc@xxxxxxxxx>
---
 mm/damon/ops-common.h | 13 +++++++++++++
 mm/damon/paddr.c      | 15 ++++++++++-----
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/mm/damon/ops-common.h b/mm/damon/ops-common.h
index 5efa5b5970def..0ec75276d985a 100644
--- a/mm/damon/ops-common.h
+++ b/mm/damon/ops-common.h
@@ -23,3 +23,16 @@ bool damos_folio_filter_match(struct damos_filter *filter, struct folio *folio);
 unsigned long damon_migrate_pages(struct list_head *folio_list, int target_nid);
 
 bool damos_ops_has_filter(struct damos *s);
+
+/*
+ * paddr ops callbacks, declared here so paddr-family backends
+ * (e.g. paddr_ibs) can reuse the paddr operation implementations.
+ */
+void damon_pa_prepare_access_checks(struct damon_ctx *ctx);
+unsigned int damon_pa_check_accesses(struct damon_ctx *ctx);
+void damon_pa_apply_probes(struct damon_ctx *ctx);
+unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
+		struct damon_target *t, struct damon_region *r,
+		struct damos *scheme, unsigned long *sz_filter_passed);
+int damon_pa_scheme_score(struct damon_ctx *context,
+		struct damon_region *r, struct damos *scheme);
diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index fc2154b6221fb..5af4ac2a7ed4d 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -124,13 +124,14 @@ static void damon_pa_prepare_access_checks_faults(struct damon_ctx *ctx)
 	}
 }
 
-static void damon_pa_prepare_access_checks(struct damon_ctx *ctx)
+void damon_pa_prepare_access_checks(struct damon_ctx *ctx)
 {
 	if (ctx->sample_control.primitives_enabled.page_table)
 		damon_pa_prepare_access_checks_abit(ctx);
 	if (ctx->sample_control.primitives_enabled.page_fault)
 		damon_pa_prepare_access_checks_faults(ctx);
 }
+EXPORT_SYMBOL_GPL(damon_pa_prepare_access_checks);
 
 static bool damon_pa_young(phys_addr_t paddr, unsigned long *folio_sz)
 {
@@ -168,7 +169,7 @@ static void __damon_pa_check_access(struct damon_region *r,
 	last_addr = sampling_addr;
 }
 
-static unsigned int damon_pa_check_accesses(struct damon_ctx *ctx)
+unsigned int damon_pa_check_accesses(struct damon_ctx *ctx)
 {
 	struct damon_target *t;
 	struct damon_region *r;
@@ -184,6 +185,7 @@ static unsigned int damon_pa_check_accesses(struct damon_ctx *ctx)
 
 	return max_nr_accesses;
 }
+EXPORT_SYMBOL_GPL(damon_pa_check_accesses);
 
 static bool damon_pa_filter_match(struct damon_filter *filter,
 		struct folio *folio)
@@ -234,7 +236,7 @@ static bool damon_pa_filter_pass(phys_addr_t pa, struct folio *folio,
 	return pass;
 }
 
-static void damon_pa_apply_probes(struct damon_ctx *ctx)
+void damon_pa_apply_probes(struct damon_ctx *ctx)
 {
 	struct damon_target *t;
 	struct damon_region *r;
@@ -259,6 +261,7 @@ static void damon_pa_apply_probes(struct damon_ctx *ctx)
 		}
 	}
 }
+EXPORT_SYMBOL_GPL(damon_pa_apply_probes);
 
 /*
  * damos_pa_filter_out - Return true if the page should be filtered out.
@@ -542,7 +545,7 @@ static unsigned long damon_pa_alloc_or_free(
 
 #endif
 
-static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
+unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
 		struct damon_target *t, struct damon_region *r,
 		struct damos *scheme, unsigned long *sz_filter_passed)
 {
@@ -574,8 +577,9 @@ static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
 	}
 	return 0;
 }
+EXPORT_SYMBOL_GPL(damon_pa_apply_scheme);
 
-static int damon_pa_scheme_score(struct damon_ctx *context,
+int damon_pa_scheme_score(struct damon_ctx *context,
 		struct damon_region *r, struct damos *scheme)
 {
 	switch (scheme->action) {
@@ -595,6 +599,7 @@ static int damon_pa_scheme_score(struct damon_ctx *context,
 
 	return DAMOS_MAX_SCORE;
 }
+EXPORT_SYMBOL_GPL(damon_pa_scheme_score);
 
 static int __init damon_pa_initcall(void)
 {
-- 
2.43.0