AcoSail/kernel_optimize_test
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fs: remove ksys_dup()

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ksys_dup() is used only at one place in the kernel, namely to duplicate
fd 0 of /dev/console to stdout and stderr. The same functionality can be
achieved by using functions already available within the kernel namespace.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski 2018-10-23 16:24:09 +02:00
parent b49a733d68
commit 8243186f0c
3 changed files with 21 additions and 13 deletions
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7
fs/file.c
View File

@ -960,7 +960,7 @@ SYSCALL_DEFINE2(dup2, unsigned int, oldfd, unsigned int, newfd)
return ksys_dup3(oldfd, newfd, 0);
}
int ksys_dup(unsigned int fildes)
SYSCALL_DEFINE1(dup, unsigned int, fildes)
{
int ret = -EBADF;
struct file *file = fget_raw(fildes);
@ -975,11 +975,6 @@ int ksys_dup(unsigned int fildes)
return ret;
}
SYSCALL_DEFINE1(dup, unsigned int, fildes)
{
return ksys_dup(fildes);
}
int f_dupfd(unsigned int from, struct file *file, unsigned flags)
{
int err;

1
include/linux/syscalls.h
View File

@ -1232,7 +1232,6 @@ asmlinkage long sys_ni_syscall(void);
*/
int ksys_umount(char __user *name, int flags);
int ksys_dup(unsigned int fildes);
int ksys_chroot(const char __user *filename);
ssize_t ksys_write(unsigned int fd, const char __user *buf, size_t count);
int ksys_chdir(const char __user *filename);

26
init/main.c
View File

@ -93,6 +93,7 @@
#include <linux/rodata_test.h>
#include <linux/jump_label.h>
#include <linux/mem_encrypt.h>
#include <linux/file.h>
#include <asm/io.h>
#include <asm/bugs.h>
@ -1157,13 +1158,26 @@ static int __ref kernel_init(void *unused)
void console_on_rootfs(void)
{
/* Open the /dev/console as stdin, this should never fail */
if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
pr_err("Warning: unable to open an initial console.\n");
struct file *file;
unsigned int i;
/* create stdout/stderr */
(void) ksys_dup(0);
(void) ksys_dup(0);
/* Open /dev/console in kernelspace, this should never fail */
file = filp_open("/dev/console", O_RDWR, 0);
if (!file)
goto err_out;
/* create stdin/stdout/stderr, this should never fail */
for (i = 0; i < 3; i++) {
if (f_dupfd(i, file, 0) != i)
goto err_out;
}
return;
err_out:
/* no panic -- this might not be fatal */
pr_err("Warning: unable to open an initial console.\n");
return;
}
static noinline void __init kernel_init_freeable(void)