FAILED: patch "[PATCH] parisc: Drop WARN_ON_ONCE() from flush_cache_vmap" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-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-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 4eab1c27ce1f0e89ab67b01bf1e4e4c75215708a
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2025082107-limeade-bolt-c120@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

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

From 4eab1c27ce1f0e89ab67b01bf1e4e4c75215708a Mon Sep 17 00:00:00 2001
From: John David Anglin <dave.anglin@bell.net>
Date: Mon, 21 Jul 2025 16:18:41 -0400
Subject: [PATCH] parisc: Drop WARN_ON_ONCE() from flush_cache_vmap

I have observed warning to occassionally trigger.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v5.12+

diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index 3b37a7e7abe4..37ca484cc495 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -841,7 +841,7 @@ void flush_cache_vmap(unsigned long start, unsigned long end)
 	}
 
 	vm = find_vm_area((void *)start);
-	if (WARN_ON_ONCE(!vm)) {
+	if (!vm) {
 		flush_cache_all();
 		return;
 	}