linux-kernel - [PATCH 2/2] mm: swap_cgroup: get rid of __lookup_swap

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Message-ID: <20241115190229.676440-2-roman.gushchin@linux.dev>
Date: Fri, 15 Nov 2024 19:02:29 +0000
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Michal Hocko <mhocko@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>
Subject: [PATCH 2/2] mm: swap_cgroup: get rid of __lookup_swap_cgroup()

Because swap_cgroup map is now virtually contiguous,
swap_cgroup_record() can be simplified, which eliminates
a need to use __lookup_swap_cgroup().

Now as __lookup_swap_cgroup() is really trivial and is used only once,
it can be inlined.

Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>
---
 mm/swap_cgroup.c | 18 ++----------------
 1 file changed, 2 insertions(+), 16 deletions(-)

diff --git a/mm/swap_cgroup.c b/mm/swap_cgroup.c
index 18de498c84a4..0db907308c94 100644
--- a/mm/swap_cgroup.c
+++ b/mm/swap_cgroup.c
@@ -33,13 +33,6 @@ static struct swap_cgroup_ctrl swap_cgroup_ctrl[MAX_SWAPFILES];
  *
  * TODO: we can push these buffers out to HIGHMEM.
  */
-
-static struct swap_cgroup *__lookup_swap_cgroup(struct swap_cgroup_ctrl *ctrl,
-						pgoff_t offset)
-{
-	return &ctrl->map[offset];
-}
-
 static struct swap_cgroup *lookup_swap_cgroup(swp_entry_t ent,
 					struct swap_cgroup_ctrl **ctrlp)
 {
@@ -49,7 +42,7 @@ static struct swap_cgroup *lookup_swap_cgroup(swp_entry_t ent,
 	ctrl = &swap_cgroup_ctrl[swp_type(ent)];
 	if (ctrlp)
 		*ctrlp = ctrl;
-	return __lookup_swap_cgroup(ctrl, offset);
+	return &ctrl->map[offset];
 }
 
 /**
@@ -104,16 +97,9 @@ unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id,
 
 	spin_lock_irqsave(&ctrl->lock, flags);
 	old = sc->id;
-	for (;;) {
+	for (; offset < end; offset++, sc++) {
 		VM_BUG_ON(sc->id != old);
 		sc->id = id;
-		offset++;
-		if (offset == end)
-			break;
-		if (offset % SC_PER_PAGE)
-			sc++;
-		else
-			sc = __lookup_swap_cgroup(ctrl, offset);
 	}
 	spin_unlock_irqrestore(&ctrl->lock, flags);
 
-- 
2.47.0.338.g60cca15819-goog