Subject: Re: linux-next: build failure after merge of the mm tree

From: Andrew Morton <[email-masked]>
Date: Mon, 9 Dec 2024 18:25:57 -0800

On Mon, 9 Dec 2024 17:08:29 +1100 Stephen Rothwell <[email-masked]> wrote:

> Hi all,
> 
> After merging the mm tree, today's linux-next build (powerpc allyesconfig)
> failed like this:
> 
> In file included from mm/damon/vaddr.c:736:
> mm/damon/tests/vaddr-kunit.h: In function 'damon_test_three_regions_in_vmas':
> mm/damon/tests/vaddr-kunit.h:92:1: error: the frame size of 3280 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
>    92 | }
>       | ^
> 
> Presumably caused by commit
> 
>   062111898568 ("mm: move per-vma lock into vm_area_struct")
> 

How about this?

From: Andrew Morton <[email-masked]>
Subject: mm/damon/tests/vaddr-kunit.h: reduce stack consumption
Date: Mon Dec  9 06:20:01 PM PST 2024

After "mm: move per-vma lock into vm_area_struct" we're hitting

mm/damon/tests/vaddr-kunit.h: In function 'damon_test_three_regions_in_vmas':
mm/damon/tests/vaddr-kunit.h:92:1: error: the frame size of 3280 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]

Fix by moving all those vmas off the stack.

Closes: https://lkml.kernel.org/r/[email-masked]
Reported-by: Stephen Rothwell <[email-masked]>
Cc: SeongJae Park <[email-masked]>
Cc: Suren Baghdasaryan <[email-masked]>
Signed-off-by: Andrew Morton <[email-masked]>
---

 mm/damon/tests/vaddr-kunit.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/damon/tests/vaddr-kunit.h~mm-damon-tests-vaddr-kunith-reduce-stack-consumption
+++ a/mm/damon/tests/vaddr-kunit.h
@@ -68,7 +68,7 @@ static void damon_test_three_regions_in_
 	static struct mm_struct mm;
 	struct damon_addr_range regions[3] = {0};
 	/* 10-20-25, 200-210-220, 300-305, 307-330 */
-	struct vm_area_struct vmas[] = {
+	static const struct vm_area_struct vmas[] = {
 		(struct vm_area_struct) {.vm_start = 10, .vm_end = 20},
 		(struct vm_area_struct) {.vm_start = 20, .vm_end = 25},
 		(struct vm_area_struct) {.vm_start = 200, .vm_end = 210},
_