[PATCH 4/7] mm/damon/core: remove damon_set_region_biggest_system_ram_default()

SeongJae Park
2026-04-29T04:12:38Z

Now nobody is using damon_set_region_biggest_system_ram_default().
Remove it.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
include/linux/damon.h | 5 ----
mm/damon/core.c | 64 -------------------------------------------
2 files changed, 69 deletions(-)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index f656908b2d389..c7a31572689be 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -1015,11 +1015,6 @@ int damon_set_region_system_rams_default(struct damon_target *t,
unsigned long addr_unit,
unsigned long min_region_sz);

-int damon_set_region_biggest_system_ram_default(struct damon_target *t,
- unsigned long *start, unsigned long *end,
- unsigned long addr_unit,
- unsigned long min_region_sz);
-
#endif /* CONFIG_DAMON */

#endif /* _DAMON_H */
diff --git a/mm/damon/core.c b/mm/damon/core.c
index 980a31cd3498e..9f38deddcb30e 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -3408,70 +3408,6 @@ int damon_set_region_system_rams_default(struct damon_target *t,
return damon_set_regions(t, &addr_range, 1, min_region_sz);
}

-static int walk_system_ram(struct resource *res, void *arg)
-{
- struct resource *a = arg;
-
- if (resource_size(a) < resource_size(res)) {
- a->start = res->start;
- a->end = res->end;
- }
- return 0;
-}
-
-/*
- * Find biggest 'System RAM' resource and store its start and end address in
- * @start and @end, respectively. If no System RAM is found, returns false.
- */
-static bool damon_find_biggest_system_ram(unsigned long *start,
- unsigned long *end, unsigned long addr_unit)
-
-{
- struct resource res = {};
-
- walk_system_ram_res(0, -1, &res, walk_system_ram);
- *start = damon_res_to_core_addr(res.start, addr_unit);
- *end = damon_res_to_core_addr(res.end + 1, addr_unit);
- if (*end <= *start)
- return false;
- return true;
-}
-
-/**
- * damon_set_region_biggest_system_ram_default() - Set the region of the given
- * monitoring target as requested, or biggest 'System RAM'.
- * @t: The monitoring target to set the region.
- * @start: The pointer to the start address of the region.
- * @end: The pointer to the end address of the region.
- * @addr_unit: The address unit for the damon_ctx of @t.
- * @min_region_sz: Minimum region size.
- *
- * This function sets the region of @t as requested by @start and @end. If the
- * values of @start and @end are zero, however, this function finds the biggest
- * 'System RAM' resource and sets the region to cover the resource. In the
- * latter case, this function saves the start and end addresses of the resource
- * in @start and @end, respectively.
- *
- * Return: 0 on success, negative error code otherwise.
- */
-int damon_set_region_biggest_system_ram_default(struct damon_target *t,
- unsigned long *start, unsigned long *end,
- unsigned long addr_unit, unsigned long min_region_sz)
-{
- struct damon_addr_range addr_range;
-
- if (*start > *end)
- return -EINVAL;
-
- if (!*start && !*end &&
- !damon_find_biggest_system_ram(start, end, addr_unit))
- return -EINVAL;
-
- addr_range.start = *start;
- addr_range.end = *end;
- return damon_set_regions(t, &addr_range, 1, min_region_sz);
-}
-
/*
* damon_moving_sum() - Calculate an inferred moving sum value.
* @mvsum: Inferred sum of the last @len_window values.
--
2.47.3