linux-kernel - Re: [PATCH v2 2/7] include: add setbits32/clrbits32/clrsetbits32/setbits64/clrbits64/clrsetbits64 in linux/setbits.h

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Date:   Tue, 25 Sep 2018 07:05:00 +0200
From:   Christophe LEROY <christophe.leroy@....fr>
To:     Corentin Labbe <clabbe@...libre.com>, Gilles.Muller@...6.fr,
        Julia.Lawall@...6.fr, agust@...x.de, airlied@...ux.ie,
        alexandre.torgue@...com, alistair@...ple.id.au,
        benh@...nel.crashing.org, carlo@...one.org, davem@...emloft.net,
        galak@...nel.crashing.org, joabreu@...opsys.com,
        khilman@...libre.com, maxime.ripard@...tlin.com,
        michal.lkml@...kovi.net, mpe@...erman.id.au,
        mporter@...nel.crashing.org, narmstrong@...libre.com,
        nicolas.palix@...g.fr, oss@...error.net, paulus@...ba.org,
        peppe.cavallaro@...com, tj@...nel.org, vitb@...nel.crashing.org,
        wens@...e.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-ide@...r.kernel.org,
        linux-amlogic@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
        cocci@...teme.lip6.fr, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/7] include: add
 setbits32/clrbits32/clrsetbits32/setbits64/clrbits64/clrsetbits64 in
 linux/setbits.h



Le 24/09/2018 à 21:04, Corentin Labbe a écrit :
> This patch adds setbits32/clrbits32/clrsetbits32 and
> setbits64/clrbits64/clrsetbits64 in linux/setbits.h header.

Fix the patch subject and description.

> 
> Signed-off-by: Corentin Labbe <clabbe@...libre.com>
> ---
>   include/linux/setbits.h | 88 +++++++++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 88 insertions(+)
>   create mode 100644 include/linux/setbits.h
> 
> diff --git a/include/linux/setbits.h b/include/linux/setbits.h
> new file mode 100644
> index 000000000000..6e7e257134ae
> --- /dev/null
> +++ b/include/linux/setbits.h
> @@ -0,0 +1,88 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __LINUX_SETBITS_H
> +#define __LINUX_SETBITS_H
> +
> +#include <linux/io.h>
> +
> +#define __setbits(readfunction, writefunction, addr, set) \
> +	writefunction((readfunction(addr) | (set)), addr)

You don't need so long names for parameters in a 2 lines macro (See 
Linux Kernel Codying style §4 Naming).

A single line macro would be feasible with only 3 chars names:

#define __setbits(rfn, wfn, addr, set) wfn((rfn(addr) | (set)), addr)

> +#define __clrbits(readfunction, writefunction, addr, mask) \
> +	writefunction((readfunction(addr) & ~(mask)), addr)
> +#define __clrsetbits(readfunction, writefunction, addr, mask, set) \
> +	writefunction(((readfunction(addr) & ~(mask)) | (set)), addr)
> +#define __setclrbits(readfunction, writefunction, addr, mask, set) \
> +	writefunction(((readfunction(addr) | (set)) & ~(mask)), addr)
> +
> +#ifndef setbits_le32
> +#define setbits_le32(addr, set) __setbits(readl, writel, addr, set)
> +#endif
> +#ifndef setbits_le32_relaxed
> +#define setbits_le32_relaxed(addr, set) __setbits(readl_relaxed, writel_relaxed, \
> +					       addr, set)
> +#endif
> +
> +#ifndef clrbits_le32
> +#define clrbits_le32(addr, mask) __clrbits(readl, writel, addr, mask)
> +#endif
> +#ifndef clrbits_le32_relaxed
> +#define clrbits_le32_relaxed(addr, mask) __clrbits(readl_relaxed, writel_relaxed, \
> +						addr, mask)
> +#endif
> +
> +#ifndef clrsetbits_le32
> +#define clrsetbits_le32(addr, mask, set) __clrsetbits(readl, writel, addr, mask, set)
> +#endif
> +#ifndef clrsetbits_le32_relaxed
> +#define clrsetbits_le32_relaxed(addr, mask, set) __clrsetbits(readl_relaxed, \
> +							   writel_relaxed, \
> +							   addr, mask, set)
> +#endif
> +
> +#ifndef setclrbits_le32
> +#define setclrbits_le32(addr, mask, set) __setclrbits(readl, writel, addr, mask, set)
> +#endif
> +#ifndef setclrbits_le32_relaxed
> +#define setclrbits_le32_relaxed(addr, mask, set) __setclrbits(readl_relaxed, \
> +							   writel_relaxed, \
> +							   addr, mask, set)
> +#endif
> +
> +/* We cannot use CONFIG_64BIT as some x86 drivers use non-atomicwriteq() */
> +#if defined(writeq) && defined(readq)

Take care. At least Alpha Arch defines it as a static inline without
redefining it as a #define. (see arch/alpha/kernel/io.c)

Christophe

> +#ifndef setbits_le64
> +#define setbits_le64(addr, set) __setbits(readq, writeq, addr, set)
> +#endif
> +#ifndef setbits_le64_relaxed
> +#define setbits_le64_relaxed(addr, set) __setbits(readq_relaxed, writeq_relaxed, \
> +					       addr, set)
> +#endif
> +
> +#ifndef clrbits_le64
> +#define clrbits_le64(addr, mask) __clrbits(readq, writeq, addr, mask)
> +#endif
> +#ifndef clrbits_le64_relaxed
> +#define clrbits_le64_relaxed(addr, mask) __clrbits(readq_relaxed, writeq_relaxed, \
> +						addr, mask)
> +#endif
> +
> +#ifndef clrsetbits_le64
> +#define clrsetbits_le64(addr, mask, set) __clrsetbits(readq, writeq, addr, mask, set)
> +#endif
> +#ifndef clrsetbits_le64_relaxed
> +#define clrsetbits_le64_relaxed(addr, mask, set) __clrsetbits(readq_relaxed, \
> +							   writeq_relaxed, \
> +							   addr, mask, set)
> +#endif
> +
> +#ifndef setclrbits_le64
> +#define setclrbits_le64(addr, mask, set) __setclrbits(readq, writeq, addr, mask, set)
> +#endif
> +#ifndef setclrbits_le64_relaxed
> +#define setclrbits_le64_relaxed(addr, mask, set) __setclrbits(readq_relaxed, \
> +							   writeq_relaxed, \
> +							   addr, mask, set)
> +#endif
> +
> +#endif /* writeq/readq */
> +
> +#endif /* __LINUX_SETBITS_H */
>