linux-kernel - Re: [PATCH -next v2] x86/power: fix doc warnings in cpu.c

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Date:   Thu, 17 Jun 2021 14:12:27 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Baokun Li <libaokun1@...wei.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Yue Haibing <yuehaibing@...wei.com>, yangjihong1@...wei.com,
        yu kuai <yukuai3@...wei.com>
Subject: Re: [PATCH -next v2] x86/power: fix doc warnings in cpu.c

On Tue, Jun 15, 2021 at 5:26 AM Baokun Li <libaokun1@...wei.com> wrote:
>
> Fixes the following W=1 kernel build warning(s):
>
>  arch/x86/power/cpu.c:76: warning: Function parameter or
>   member 'ctxt' not described in '__save_processor_state'
>  arch/x86/power/cpu.c:192: warning: Function parameter or
>   member 'ctxt' not described in '__restore_processor_state'
>
> Signed-off-by: Baokun Li <libaokun1@...wei.com>
> ---
> V1->V2:
>         Fix the formatting of this kerneldoc comment
>
>  arch/x86/power/cpu.c | 31 ++++++++++++++++---------------
>  1 file changed, 16 insertions(+), 15 deletions(-)
>
> diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
> index 3a070e7cdb8b..54b530db5ed0 100644
> --- a/arch/x86/power/cpu.c
> +++ b/arch/x86/power/cpu.c
> @@ -58,19 +58,20 @@ static void msr_restore_context(struct saved_context *ctxt)
>  }
>
>  /**
> - *     __save_processor_state - save CPU registers before creating a
> - *             hibernation image and before restoring the memory state from it
> - *     @ctxt - structure to store the registers contents in
> + * __save_processor_statei() - Save CPU registers before creating a
> + *                             hibernation image and before restoring
> + *                             the memory state from it
> + * @ctxt: Structure to store the registers contents in.
>   *
> - *     NOTE: If there is a CPU register the modification of which by the
> - *     boot kernel (ie. the kernel used for loading the hibernation image)
> - *     might affect the operations of the restored target kernel (ie. the one
> - *     saved in the hibernation image), then its contents must be saved by this
> - *     function.  In other words, if kernel A is hibernated and different
> - *     kernel B is used for loading the hibernation image into memory, the
> - *     kernel A's __save_processor_state() function must save all registers
> - *     needed by kernel A, so that it can operate correctly after the resume
> - *     regardless of what kernel B does in the meantime.
> + * NOTE: If there is a CPU register the modification of which by the
> + * boot kernel (ie. the kernel used for loading the hibernation image)
> + * might affect the operations of the restored target kernel (ie. the one
> + * saved in the hibernation image), then its contents must be saved by this
> + * function.  In other words, if kernel A is hibernated and different
> + * kernel B is used for loading the hibernation image into memory, the
> + * kernel A's __save_processor_state() function must save all registers
> + * needed by kernel A, so that it can operate correctly after the resume
> + * regardless of what kernel B does in the meantime.
>   */
>  static void __save_processor_state(struct saved_context *ctxt)
>  {
> @@ -181,9 +182,9 @@ static void fix_processor_context(void)
>  }
>
>  /**
> - * __restore_processor_state - restore the contents of CPU registers saved
> - *                             by __save_processor_state()
> - * @ctxt - structure to load the registers contents from
> + * __restore_processor_state() - Restore the contents of CPU registers saved
> + *                               by __save_processor_state()
> + * @ctxt: Structure to load the registers contents from.
>   *
>   * The asm code that gets us here will have restored a usable GDT, although
>   * it will be pointing to the wrong alias.
> --

Applied as 5.14 material, thanks!