FAILED: patch "[PATCH] drm/msm: Restore second parameter name in purge() and evict()" failed to apply to 6.18-stable tree

The patch below does not apply to the 6.18-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 <[email protected]>.

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-6.18.y
git checkout FETCH_HEAD
git cherry-pick -x 8de061ca149c94871e41d91a5b2e442ecc26a572
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026072919-drown-simplify-2be6@gregkh' --subject-prefix 'PATCH 6.18.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

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

From 8de061ca149c94871e41d91a5b2e442ecc26a572 Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <[email protected]>
Date: Mon, 18 May 2026 15:17:14 -0700
Subject: [PATCH] drm/msm: Restore second parameter name in purge() and evict()

After commit 3392291fc509 ("drm/msm: Fix shrinker deadlock"), all supported versions of clang warn (or error with CONFIG_WERROR=y):

drivers/gpu/drm/msm/msm_gem_shrinker.c:105:58: error: omitting the parameter name in a function definition is a C23 extension [-Werror,-Wc23-extensions]
105 | purge(struct drm_gem_object *obj, struct ww_acquire_ctx *)
| ^
drivers/gpu/drm/msm/msm_gem_shrinker.c:117:58: error: omitting the parameter name in a function definition is a C23 extension [-Werror,-Wc23-extensions]
117 | evict(struct drm_gem_object *obj, struct ww_acquire_ctx *)
| ^
2 errors generated.

With older but supported versions of GCC, this is an unconditional hard error:

drivers/gpu/drm/msm/msm_gem_shrinker.c: In function 'purge':
drivers/gpu/drm/msm/msm_gem_shrinker.c:105:35: error: parameter name omitted
purge(struct drm_gem_object *obj, struct ww_acquire_ctx *)

                                     ^~~~~~~~~~~~~~~~~~~~~~~
  drivers/gpu/drm/msm/msm_gem_shrinker.c: In function 'evict':
  drivers/gpu/drm/msm/msm_gem_shrinker.c:117:35: error: parameter name omitted
   evict(struct drm_gem_object *obj, struct ww_acquire_ctx *)
                                     ^~~~~~~~~~~~~~~~~~~~~~~

Restore the parameter name to clear up the warnings, renaming it "unused" to make it clear it is only needed to satisfy the prototype of drm_gem_lru_scan().

Patchwork: https://patchwork.freedesktop.org/patch/725924/

index 6e39e4e578bb..8f118b5185a1 100644
@@ -102,7 +102,7 @@ with_vm_locks(void (*fn)(struct drm_gem_object *obj),
 }
 
 static bool
-purge(struct drm_gem_object *obj, struct ww_acquire_ctx *)
+purge(struct drm_gem_object *obj, struct ww_acquire_ctx *unused)
 {
 	if (!is_purgeable(to_msm_bo(obj)))
 		return false;

@@ -114,7 +114,7 @@ purge(struct drm_gem_object *obj, struct ww_acquire_ctx *)
 }
 
 static bool
-evict(struct drm_gem_object *obj, struct ww_acquire_ctx *)
+evict(struct drm_gem_object *obj, struct ww_acquire_ctx *unused)
 {
 	if (is_unevictable(to_msm_bo(obj)))
 		return false;