linux-kernel - Re: [PATCH 5/6] bitops: wrap non-atomic bitops with a transparent macro

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Message-Id: <20220607110705.72887-1-alexandr.lobakin@intel.com>
Date:   Tue,  7 Jun 2022 13:07:05 +0200
From:   Alexander Lobakin <alexandr.lobakin@...el.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        Yury Norov <yury.norov@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Richard Henderson <rth@...ddle.net>,
        Matt Turner <mattst88@...il.com>,
        Brian Cain <bcain@...cinc.com>,
        "Geert Uytterhoeven" <geert@...ux-m68k.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Marco Elver <elver@...gle.com>, Borislav Petkov <bp@...e.de>,
        Tony Luck <tony.luck@...el.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        linux-alpha@...r.kernel.org, linux-hexagon@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] bitops: wrap non-atomic bitops with a transparent macro

From: Alexander Lobakin <alexandr.lobakin@...el.com>
Date: Tue, 7 Jun 2022 12:57:18 +0200

> From: Mark Rutland <mark.rutland@....com>
> Date: Mon, 6 Jun 2022 17:27:16 +0100
> 
> > On Mon, Jun 06, 2022 at 01:49:06PM +0200, Alexander Lobakin wrote:
> > > In preparation for altering the non-atomic bitops with a macro, wrap
> > > them in a transparent definition. This requires prepending one more
> > > '_' to their names in order to be able to do that seamlessly.
> > > sparc32 already has the triple-underscored functions, so I had to
> > > rename them ('___' -> 'sp32_').
> > 
> > Could we use an 'arch_' prefix here, like we do for the atomics, or is that
> > already overloaded?
> 
> Yeah it is, for example, x86 has 'arch_' functions defined in its
> architecture headers[0] and at the same time uses generic
> instrumented '__' helpers[1], so on x86 both underscored and 'arch_'
> are defined and they are not the same.

Oh well, forgot to attach the links. Can be found at the bottom of
this mail.

> Same with those sparc32 triple-underscored, sparc32 at the same time
> uses generic non-instrumented, so it has underscored, 'arch_' and
> triple-underscored.
> 
> In general, bitops are overloaded with tons of prefixes already :)
> I'm not really glad that I introduced one more level, but not that
> we have many options here.
> 
> > 
> > Thanks,
> > Mark.
> > 
> > > 
> > > Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
> > > ---
> 
> [...]
> 
> > > -- 
> > > 2.36.1
> 
> Thanks,
> Olek

[0] https://elixir.bootlin.com/linux/v5.19-rc1/source/arch/x86/include/asm/bitops.h#L136
[1] https://elixir.bootlin.com/linux/v5.19-rc1/source/include/asm-generic/bitops/instrumented-non-atomic.h#L93

Thanks,
Olek