linux-kernel - Re: Applied "spi: work around clang bug in SPI_BPW_RANGE

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Date:   Wed, 13 Mar 2019 22:01:46 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Applied "spi: work around clang bug in SPI_BPW_RANGE_MASK()" to
 the spi tree

On Wed, Mar 13, 2019 at 8:15 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> > -#define SPI_BIT_MASK(bits) (((bits) == 32) ? ~0U : (BIT(bits) - 1))
> > -#define SPI_BPW_RANGE_MASK(min, max) (SPI_BIT_MASK(max) - SPI_BIT_MASK(min - 1))
> > +#define SPI_BPW_RANGE_MASK(min, max) GENMASK((min) - 1, (max) - 1)
>
> This is not correct: GENMASK() order is from msb to lsb.
> So it should it:
>
> +#define SPI_BPW_RANGE_MASK(min, max) GENMASK((max) - 1, (min) - 1)

Sorry about the mess, I've sent a fixup now.

       Arnd