drm/msm/shrinker: Fix can_block() logic

[ Upstream commit df0f439 ]

The intention here was to allow blocking if DIRECT_RECLAIM or if called
from kswapd and KSWAPD_RECLAIM is set.

Reported by Claude code review: https://lore.gitlab.freedesktop.org/drm-ai-reviews/review-patch9-20260309151119.290217-10-boris.brezillon@collabora.com/ on a panthor patch which had copied similar logic.

Reported-by: Boris Brezillon <boris.brezillon@collabora.com>
Fixes: 7860d72 ("drm/msm: Fix build break with recent mm tree")
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Patchwork: https://patchwork.freedesktop.org/patch/714238/
Message-ID: <20260325184106.1259528-1-robin.clark@oss.qualcomm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Rob Clark

drivers/gpu/drm/msm/msm_gem_shrinker.c

@@ -26,9 +26,8 @@ static bool can_swap(void)
 
 static bool can_block(struct shrink_control *sc)
 {
-	if (!(sc->gfp_mask & __GFP_DIRECT_RECLAIM))
-		return false;
-	return current_is_kswapd() || (sc->gfp_mask & __GFP_RECLAIM);
+	return (sc->gfp_mask & __GFP_DIRECT_RECLAIM) ||
+	       (current_is_kswapd() && (sc->gfp_mask & __GFP_KSWAPD_RECLAIM));
 }
 
 static unsigned long