From: SeongJae Park <sj@kernel.org>
Date: Wed, 29 Apr 2026 04:12:26 +0000 (-0700)
Subject: mm/damon/core: remove damon_set_region_biggest_system_ram_default()
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a870b43776c0c9740a087eb0d831cd6cb8016f7;p=thirdparty%2Fkernel%2Flinux.git

mm/damon/core: remove damon_set_region_biggest_system_ram_default()

Now nobody is using damon_set_region_biggest_system_ram_default().  Remove
it.

Link: https://lore.kernel.org/20260429041232.90257-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/include/linux/damon.h b/include/linux/damon.h
index f656908b2d38..c7a31572689b 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 980a31cd3498..9f38deddcb30 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.