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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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87c4e19262
Using the fs-internal do_mknodat() helper allows us to get rid of fs-internal calls to the sys_mknodat() syscall. Introducing the ksys_mknod() wrapper allows us to avoid the in-kernel calls to sys_mknod() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_mknod(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/*
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* init/noinitramfs.c
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*
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* Copyright (C) 2006, NXP Semiconductors, All Rights Reserved
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* Author: Jean-Paul Saman <jean-paul.saman@nxp.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/stat.h>
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#include <linux/kdev_t.h>
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#include <linux/syscalls.h>
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/*
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* Create a simple rootfs that is similar to the default initramfs
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*/
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static int __init default_rootfs(void)
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{
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int err;
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err = ksys_mkdir((const char __user __force *) "/dev", 0755);
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if (err < 0)
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goto out;
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err = ksys_mknod((const char __user __force *) "/dev/console",
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S_IFCHR | S_IRUSR | S_IWUSR,
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new_encode_dev(MKDEV(5, 1)));
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if (err < 0)
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goto out;
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err = ksys_mkdir((const char __user __force *) "/root", 0700);
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if (err < 0)
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goto out;
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return 0;
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out:
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printk(KERN_WARNING "Failed to create a rootfs\n");
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return err;
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}
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rootfs_initcall(default_rootfs);
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