linux-kernel - Re: [PATCH 6.1.y and 6.6.y] LoongArch/smp: Call rcutree_report_cpu_starting() at tlb

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Message-ID: <2024020237-liable-strife-4800@gregkh>
Date: Fri, 2 Feb 2024 17:27:44 -0800
From: Greg KH <gregkh@...uxfoundation.org>
To: Huacai Chen <chenhuacai@...ngson.cn>
Cc: Huacai Chen <chenhuacai@...nel.org>, loongarch@...ts.linux.dev,
	stable@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
	Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
	Jiaxun Yang <jiaxun.yang@...goat.com>, linux-kernel@...r.kernel.org,
	loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH 6.1.y and 6.6.y] LoongArch/smp: Call
 rcutree_report_cpu_starting() at tlb_init()

On Wed, Jan 31, 2024 at 03:21:51PM +0800, Huacai Chen wrote:
> Machines which have more than 8 nodes fail to boot SMP after commit
> a2ccf46333d7b2cf96 ("LoongArch/smp: Call rcutree_report_cpu_starting()
> earlier"). Because such machines use tlb-based per-cpu base address
> rather than dmw-based per-cpu base address, resulting per-cpu variables
> can only be accessed after tlb_init(). But rcutree_report_cpu_starting()
> is now called before tlb_init() and accesses per-cpu variables indeed.
> 
> Since the original patch want to avoid the lockdep warning caused by
> page allocation in tlb_init(), we can move rcutree_report_cpu_starting()
> to tlb_init() where after tlb exception configuration but before page
> allocation.
> 
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
> ---
>  arch/loongarch/kernel/smp.c |  1 -
>  arch/loongarch/mm/tlb.c     | 16 ++++++++++------
>  2 files changed, 10 insertions(+), 7 deletions(-)

Now queued up, thanks.

greg k-h