lkml.org 
[lkml]   [2022]   [Mar]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [BUG] Crash on x86_32 for: mm: page_alloc: avoid merging non-fallbackable pageblocks with others
On Wed, 30 Mar 2022 16:29:28 -0400
Zi Yan <ziy@nvidia.com> wrote:

> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index bdc8f60ae462..83a90e2973b7 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1108,6 +1108,8 @@ static inline void __free_one_page(struct page *page,
>
> buddy_pfn = __find_buddy_pfn(pfn, order);
> buddy = page + (buddy_pfn - pfn);
> + if (!page_is_buddy(page, buddy, order))
> + goto done_merging;
> buddy_mt = get_pageblock_migratetype(buddy);
>
> if (migratetype != buddy_mt
>

The above did not apply to Linus's tree, nor even the problem commit
(before or after), but I found where the code is, and added it manually.

It does appear to allow the machine to boot.

-- Steve

\
 
 \ /
  Last update: 2022-03-30 22:54    [W:0.249 / U:0.612 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site