+ lib-interval_tree-fix-allocation-warning-messages.patch added to mm-nonmm-unstable branch

+ lib-interval_tree-fix-allocation-warning-messages.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: lib/interval_tree: fix allocation warning messages
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     lib-interval_tree-fix-allocation-warning-messages.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/lib-interval_tree-fix-allocation-warning-messages.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Karl Mehltretter <kmehltretter@gmail.com>
Subject: lib/interval_tree: fix allocation warning messages
Date: Sat, 8 Aug 2026 14:36:08 +0200

WARN_ON_ONCE() takes a condition, not a message.  The string literals are
always true, so the warnings still trigger but the messages are never
printed.

Use WARN_ONCE(1, ...) instead to print the messages and keep the once-only
behavior.

Found with a Coccinelle script.  Clang's -Wstring-conversion also flags
such calls but is not enabled in kernel builds.

Link: https://lore.kernel.org/20260808123608.73613-1-kmehltretter@gmail.com
Fixes: 82114e45131f ("lib/interval_tree: add test case for interval_tree_iter_xxx() helpers")
Assisted-by: Claude:claude-fable-5 coccinelle
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/interval_tree_test.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/lib/interval_tree_test.c~lib-interval_tree-fix-allocation-warning-messages
+++ a/lib/interval_tree_test.c
@@ -140,13 +140,13 @@ static int intersection_range_check(void
 
 	intxn1 = bitmap_alloc(nnodes, GFP_KERNEL);
 	if (!intxn1) {
-		WARN_ON_ONCE("Failed to allocate intxn1\n");
+		WARN_ONCE(1, "Failed to allocate intxn1\n");
 		return -ENOMEM;
 	}
 
 	intxn2 = bitmap_alloc(nnodes, GFP_KERNEL);
 	if (!intxn2) {
-		WARN_ON_ONCE("Failed to allocate intxn2\n");
+		WARN_ONCE(1, "Failed to allocate intxn2\n");
 		bitmap_free(intxn1);
 		return -ENOMEM;
 	}
_

Patches currently in -mm which might be from kmehltretter@gmail.com are

lib-interval_tree-fix-allocation-warning-messages.patch