linux-kernel - Re: [PATCH v2 02/11] asm-generic/pgtable: Adds dummy functions to monitor lockless pgtable walks

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Message-ID: <007934281451e843a0428dc1e674f9dae149b75b.camel@linux.ibm.com>
Date:   Mon, 23 Sep 2019 17:48:24 -0300
From:   Leonardo Bras <leonardo@...ux.ibm.com>
To:     John Hubbard <jhubbard@...dia.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnd Bergmann <arnd@...db.de>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Richard Fontana <rfontana@...hat.com>,
        Ganesh Goudar <ganeshgr@...ux.ibm.com>,
        Allison Randal <allison@...utok.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Keith Busch <keith.busch@...el.com>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH v2 02/11] asm-generic/pgtable: Adds dummy functions to
 monitor lockless pgtable walks

Thanks for the feedback,

On Mon, 2019-09-23 at 13:39 -0700, John Hubbard wrote:
> Please remember to include linux-mm if there is a v2.

Sure, I will include on v3.

> Nit: seems like it would be nicer to just put it all in one place, and use
> positive logic, and also I think people normally don't compress the empty
> functions quite that much. So like this:

I did this by following the default on the rest of this file.
As you can see, all other features use the standard of 
#ifndef SOMETHING
dummy/generic functions
#endif

Declaring the functions become responsibility of the arch.

> #ifdef __HAVE_ARCH_LOCKLESS_PGTBL_WALK_COUNTER
> void start_lockless_pgtbl_walk(struct mm_struct *mm); 
> void end_lockless_pgtbl_walk(struct mm_struct *mm); 
> int running_lockless_pgtbl_walk(struct mm_struct *mm); 
> 
> #else
> static inline void start_lockless_pgtbl_walk(struct mm_struct *mm)
> {
> }
> static inline void end_lockless_pgtbl_walk(struct mm_struct *mm)
> {
> }
> static inline int running_lockless_pgtbl_walk(struct mm_struct *mm)
> {
>         return 0;
> }
> #endif
> 
> thanks,

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