linux-kernel - Re: [PATCH] spi: sh-msiof: avoid integer overflow in constants

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Date: Tue, 30 Jan 2024 12:26:54 +0100
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: linux-renesas-soc@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: sh-msiof: avoid integer overflow in constants


> What about unifying the individual SIFCTR_?FWM_[0-9]* definitions
> into SIFCTR_xFWM_[0-9]* instead, and using the bitfield helpers in its
> sole user?

But they don't match, so we can't unify them?

#define SIFCTR_TFWM_1           (7UL << 29)     /*  Transfer Request when 1 empty stage */

vs

#define SIFCTR_RFWM_1           (0 << 13)       /*  Transfer Request when 1 valid stages */

Also, the steps don't match (1, 4, 8, 12..) vs (1, 4, 8, 16...).


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