linux-kernel - Re: [PATCH 0/2] Fix page

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Message-Id: <20210317152312.32e6fc7dd469cd7df57ed2e5@linux-foundation.org>
Date:   Wed, 17 Mar 2021 15:23:12 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Chen Jun <chenjun102@...wei.com>
Cc:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <catalin.marinas@....com>,
        <will@...nel.org>, <rui.xiang@...wei.com>
Subject: Re: [PATCH 0/2] Fix page_owner broken on arm64

On Wed, 17 Mar 2021 14:20:48 +0000 Chen Jun <chenjun102@...wei.com> wrote:

> On arm64, cat /sys/kernel/debug/page_owner
> All pages return the same stack
>  stack_trace_save+0x4c/0x78
>  register_early_stack+0x34/0x70
>  init_page_owner+0x34/0x230
>  page_ext_init+0x1bc/0x1dc
> 
> The reason is arch_stack_walk save 2 more entries than before.
> 
> To fix it, add skip in arch_stack_walk
> 
> *** BLURB HERE ***
> 
> 1. Prepare for 2, move stacktrace_cookie to .h
> 2. Fix the problem
> 

5fc57df2f6fd was September 2020, so I assume we'll be needing cc:stable
on these?

(I'll also assume that the arm folks will be handling these)