FAILED: patch "[PATCH] drm/ttm: apply the swapout bulk_move fix to the intended" failed to apply to 7.2-stable tree

FAILED: patch "[PATCH] drm/ttm: apply the swapout bulk_move fix to the intended" failed to apply to 7.2-stable tree

[gregkh]

The patch below does not apply to the 7.2-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-7.2.y
git checkout FETCH_HEAD
git cherry-pick -x fcfe64715b425262af1b36f498f9197f3537ceed
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026092201-stimulus-author-8bd8@gregkh' --subject-prefix 'PATCH 7.2.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From fcfe64715b425262af1b36f498f9197f3537ceed Mon Sep 17 00:00:00 2001
From: Vadim Nikitushkin <bub4z0r@gmail.com>
Date: Thu, 10 Sep 2026 17:34:51 +0300
Subject: [PATCH] drm/ttm: apply the swapout bulk_move fix to the intended
 condition
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Commit 3db7d7d58341 ("drm/ttm: fix swapped-out resources never leaving
their bulk_move range") landed in drm-misc-fixes with its one-line
change applied to the wrong "if": the "if (ret)" after
ttm_resource_try_charge() in ttm_bo_alloc_at_place() became
"if (ret > 0)", while the "if (!ret)" after ttm_tt_swapout() in
ttm_bo_swapout_cb() that the patch targeted was left untouched.

ttm_resource_try_charge() returns 0 or a negative error code, so with
"ret > 0" a failed dmem cgroup charge no longer fails the allocation.
Restore that check and apply the intended change: ttm_tt_swapout()
returns the number of pages swapped out on success, so the bulk_move
removal must run for ret > 0.

Fixes: 3db7d7d58341 ("drm/ttm: fix swapped-out resources never leaving their bulk_move range")
Cc: stable@vger.kernel.org # v7.1+
Signed-off-by: Vadim Nikitushkin <bub4z0r@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20260910143451.65853-1-bub4z0r@gmail.com

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index a12af5b38a31..9b85b5f388d4 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -532,7 +532,7 @@ static int ttm_bo_alloc_at_place(struct ttm_buffer_object *bo,
 		ret = ttm_resource_try_charge(bo, place, &alloc_state->charge_pool,
 					      force_space ? &alloc_state->limit_pool
 							  : NULL);
-		if (ret > 0) {
+		if (ret) {
 			/*
 			 * -EAGAIN means the charge failed, which we treat
 			 * like an allocation failure. Therefore, return an
@@ -1434,7 +1434,7 @@ ttm_bo_swapout_cb(struct ttm_lru_walk *walk, struct ttm_buffer_object *bo)
 
 	if (ttm_tt_is_populated(tt)) {
 		ret = ttm_tt_swapout(bdev, tt, swapout_walk->gfp_flags);
-		if (!ret) {
+		if (ret > 0) {
 			spin_lock(&bdev->lru_lock);
 			ttm_resource_del_bulk_move_unevictable(bo->resource, bo);
 			ttm_resource_move_to_lru_tail(bo->resource);