linux-kernel - Re: [PATCH v5 2/3] GHES: add a notify chain for process memory section

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Date:   Wed, 7 Feb 2018 11:31:46 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Xie XiuQi <xiexiuqi@...wei.com>
Cc:     catalin.marinas@....com, will.deacon@....com, mingo@...hat.com,
        mark.rutland@....com, ard.biesheuvel@...aro.org,
        james.morse@....com, Dave.Martin@....com,
        takahiro.akashi@...aro.org, tbaicar@...eaurora.org,
        stephen.boyd@...aro.org, julien.thierry@....com,
        shiju.jose@...wei.com, zjzhang@...eaurora.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, wangxiongfeng2@...wei.com,
        zhengqiang10@...wei.com, gengdongjiu@...wei.com,
        huawei.libin@...wei.com, wangkefeng.wang@...wei.com,
        lijinyue@...wei.com, guohanjun@...wei.com, hanjun.guo@...aro.org,
        cj.chengjian@...wei.com
Subject: Re: [PATCH v5 2/3] GHES: add a notify chain for process memory
 section

On Fri, Jan 26, 2018 at 08:31:24PM +0800, Xie XiuQi wrote:
> Add a notify chain for process memory section, with
> which other modules might do error recovery.
> 
> Signed-off-by: Xie XiuQi <xiexiuqi@...wei.com>
> Tested-by: Wang Xiongfeng <wangxiongfeng2@...wei.com>
> Tested-by: Tyler Baicar <tbaicar@...eaurora.org>
> ---
>  drivers/acpi/apei/ghes.c | 10 ++++++++++
>  include/acpi/ghes.h      |  8 ++++++++
>  2 files changed, 18 insertions(+)
> 
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index cff671d..1f0ebfb 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -109,6 +109,9 @@ static inline bool is_hest_type_generic_v2(struct ghes *ghes)
>  static LIST_HEAD(ghes_hed);
>  static DEFINE_MUTEX(ghes_list_mutex);
>  
> +ATOMIC_NOTIFIER_HEAD(ghes_mem_err_chain);
> +EXPORT_SYMBOL(ghes_mem_err_chain);

Definitely not EXPORT_SYMBOL.

And certainly not export the notifier head. Have register and unregister
functions instead.

That is, *if* you can't solve it differently with James. Notifiers
should be avoided if possible.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--