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

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Message-ID: <CAJZ5v0g2+far_FMgBSV9OdobJU6kKD6BR3pg5VabavQVYC-uQQ@mail.gmail.com>
Date:   Thu, 17 Jun 2021 19:32:24 +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 Thu, Jun 17, 2021 at 2:12 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
>
> 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!

And dropped, because it introduced a build issue.