linux-kernel - Re: + lib-vsprintf-split-out-sprintf-and-friends.patch added to mm-nonmm-unstable branch

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Message-ID: <893b27ec-3f78-47fc-8298-903f991d5aaa@p183>
Date:   Tue, 15 Aug 2023 17:24:27 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, senozhatsky@...omium.org,
        rostedt@...dmis.org, pmladek@...e.com, linux@...musvillemoes.dk,
        glider@...gle.com, elver@...gle.com, dvyukov@...gle.com,
        andriy.shevchenko@...ux.intel.com, akpm@...ux-foundation.org
Subject: Re: + lib-vsprintf-split-out-sprintf-and-friends.patch added to
 mm-nonmm-unstable branch

On Mon, Aug 14, 2023 at 11:37:51AM -0700, Andrew Morton wrote:
> Some patches that reduce the mess with the header inclusions related to
> vsprintf.c module.  Each patch has its own description, and has no
> dependencies to each other, except the collisions over modifications of
> the same places.  Hence the series.
> 
> 
> This patch (of 2):
> 
> kernel.h is being used as a dump for all kinds of stuff for a long time. 
> sprintf() and friends are used in many drivers without need of the full
> kernel.h dependency train with it.
> 
> Here is the attempt on cleaning it up by splitting out sprintf() and
> friends.


> --- /dev/null
> +++ a/include/linux/sprintf.h
> @@ -0,0 +1,25 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_KERNEL_SPRINTF_H_
> +#define _LINUX_KERNEL_SPRINTF_H_
> +
> +#include <linux/compiler_attributes.h>
> +#include <linux/types.h>
> +
> +int num_to_str(char *buf, int size, unsigned long long num, unsigned int width);
> +
> +__printf(2, 3) int sprintf(char *buf, const char * fmt, ...);
> +__printf(2, 0) int vsprintf(char *buf, const char *, va_list);
> +__printf(3, 4) int snprintf(char *buf, size_t size, const char *fmt, ...);
> +__printf(3, 0) int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
> +__printf(3, 4) int scnprintf(char *buf, size_t size, const char *fmt, ...);
> +__printf(3, 0) int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
> +__printf(2, 3) __malloc char *kasprintf(gfp_t gfp, const char *fmt, ...);
> +__printf(2, 0) __malloc char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
> +__printf(2, 0) const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list args);
> +
> +__scanf(2, 3) int sscanf(const char *, const char *, ...);
> +__scanf(2, 0) int vsscanf(const char *, const char *, va_list);

I'd suggest to leave scanf alone and rename file to printf.h
Some archs have such files already (printf.c)