linux-kernel - Re: [PATCH v7 01/10] Consolidate IO memcpy/memset into iomap

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Message-ID: <a4f85184-73d4-44e4-bddd-0c1775ed9f50@linaro.org>
Date: Thu, 3 Oct 2024 09:46:50 -0700
From: Richard Henderson <richard.henderson@...aro.org>
To: Julian Vetter <jvetter@...rayinc.com>, Arnd Bergmann <arnd@...db.de>,
 Russell King <linux@...linux.org.uk>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Guo Ren <guoren@...nel.org>, Huacai Chen <chenhuacai@...nel.org>,
 WANG Xuerui <kernel@...0n.name>, Andrew Morton <akpm@...ux-foundation.org>,
 Geert Uytterhoeven <geert@...ux-m68k.org>,
 Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner
 <mattst88@...il.com>,
 "James E . J . Bottomley" <James.Bottomley@...senpartnership.com>,
 Helge Deller <deller@....de>, Yoshinori Sato <ysato@...rs.sourceforge.jp>,
 Rich Felker <dalias@...c.org>,
 John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
 Richard Weinberger <richard@....at>,
 Anton Ivanov <anton.ivanov@...bridgegreys.com>,
 Johannes Berg <johannes@...solutions.net>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-csky@...r.kernel.org, loongarch@...ts.linux.dev,
 linux-m68k@...ts.linux-m68k.org, linux-alpha@...r.kernel.org,
 linux-parisc@...r.kernel.org, linux-sh@...r.kernel.org,
 linux-um@...ts.infradead.org, linux-arch@...r.kernel.org,
 Yann Sionneau <ysionneau@...rayinc.com>
Subject: Re: [PATCH v7 01/10] Consolidate IO memcpy/memset into iomap_copy.c

On 9/30/24 06:23, Julian Vetter wrote:
> +void memset_io(volatile void __iomem *dst, int c, size_t count)
> +{
> +	uintptr_t qc = (u8)c;

Missed one change to 'long'

> +
> +	qc |= qc << 8;
> +	qc |= qc << 16;
> +
> +#ifdef CONFIG_64BIT
> +	qc |= qc << 32;
> +#endif

Could be 'qc *= -1ul / 0xff;'

r~