linux-kernel - Re: [PATCH 4.14 023/159] mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM

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Message-ID: <20180110030804.GB1744@dhcp-128-110.nay.redhat.com>
Date:   Wed, 10 Jan 2018 11:08:04 +0800
From:   Dave Young <dyoung@...hat.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Baoquan He <bhe@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Mike Galbraith <efault@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...e.de>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, linux-mm@...ck.org,
        Vivek Goyal <vgoyal@...hat.com>, kexec@...ts.infradead.org
Subject: Re: [PATCH 4.14 023/159] mm/sparsemem: Allocate mem_section at
 runtime for CONFIG_SPARSEMEM_EXTREME=y

On Tue, Jan 09, 2018 at 12:05:52PM +0300, Kirill A. Shutemov wrote:
> On Tue, Jan 09, 2018 at 03:24:40PM +0800, Dave Young wrote:
> > On 01/09/18 at 01:41pm, Baoquan He wrote:
> > > On 01/09/18 at 09:09am, Dave Young wrote:
> > > 
> > > > As for the macro name, VMCOREINFO_SYMBOL_ARRAY sounds better.
> 
> Yep, that's better.
> 
> > > I still think using vmcoreinfo_append_str is better. Unless we replace
> > > all array variables with the newly added macro.
> > > 
> > > vmcoreinfo_append_str("SYMBOL(mem_section)=%lx\n",
> > >                                 (unsigned long)mem_section);
> > 
> > I have no strong opinion, either change all array uses or just introduce
> > the macro and start to use it from now on if we have similar array
> > symbols.
> 
> Do you need some action on my side or will you folks take care about this?

I think Baoquan was suggesting to update all array users in current code, if you can check every VMCOREINFO_SYMBOL and update all the arrays he will be happy. But if can not do it easily I'm fine with a VMCOREINFO_SYMBOL_ARRAY changes only now, we kdump people can do it later as well. 

> 
> -- 
>  Kirill A. Shutemov

Thanks
Dave