linux-kernel - Re: [PATCH v2 2/5] tools/nolibc: Add statx() and make stat() rely on statx() when available

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Date:   Wed, 8 Feb 2023 11:39:36 +0100
From:   Willy Tarreau <w@....eu>
To:     chris.chenfeiyang@...il.com
Cc:     paulmck@...nel.org, Feiyang Chen <chenfeiyang@...ngson.cn>,
        arnd@...db.de, chenhuacai@...nel.org, jiaxun.yang@...goat.com,
        loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] tools/nolibc: Add statx() and make stat() rely on
 statx() when available

Hi Feiyang,

On Wed, Feb 08, 2023 at 06:17:51PM +0800, chris.chenfeiyang@...il.com wrote:
> From: Feiyang Chen <chenfeiyang@...ngson.cn>
> 
> loongarch and riscv32 only have statx(). arc, hexagon, nios2 and
> openrisc have statx() and stat64() but not stat() or newstat().
> Add statx() and make stat() rely on statx() to make them happy.

Thanks for this, that's way better. I'm just having one small request
below:

> +/*
> + * int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf);
> + */
> +
> +static __attribute__((unused))
> +int sys_statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf)
> +{
> +	return my_syscall5(__NR_statx, fd, path, flags, mask, buf);
> +}
> +
> +static __attribute__((unused))
> +int statx(int fd, const char *path, int flags, unsigned int mask, struct statx *buf)
> +{
> +	int ret = sys_statx(fd, path, flags, mask, buf);
> +
> +	if (ret < 0) {
> +		SET_ERRNO(-ret);
> +		ret = -1;
> +	}
> +	return ret;
> +}

Please guard these inside #if defined(__NR_statx) so that this can still
be used as-is from slightly older toolchains that provide their own kernel
includes.

The rest of the series looks pretty good to me.

Thank you!
Willy