AcoSail/kernel_optimize_test
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switch /dev/kmsg to ->write_iter()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-08-23 12:23:53 -04:00
parent cd678fce42
commit 849f3127bb
1 changed files with 7 additions and 13 deletions
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20
kernel/printk/printk.c
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@ -519,14 +519,13 @@ struct devkmsg_user {
char buf[8192];
};
static ssize_t devkmsg_writev(struct kiocb *iocb, const struct iovec *iv,
unsigned long count, loff_t pos)
static ssize_t devkmsg_write(struct kiocb *iocb, struct iov_iter *from)
{
char *buf, *line;
int i;
int level = default_message_loglevel;
int facility = 1; /* LOG_USER */
size_t len = iov_length(iv, count);
size_t len = iocb->ki_nbytes;
ssize_t ret = len;
if (len > LOG_LINE_MAX)
@ -535,13 +534,10 @@ static ssize_t devkmsg_writev(struct kiocb *iocb, const struct iovec *iv,
if (buf == NULL)
return -ENOMEM;
line = buf;
for (i = 0; i < count; i++) {
if (copy_from_user(line, iv[i].iov_base, iv[i].iov_len)) {
ret = -EFAULT;
goto out;
}
line += iv[i].iov_len;
buf[len] = '\0';
if (copy_from_iter(buf, len, from) != len) {
kfree(buf);
return -EFAULT;
}
/*
@ -567,10 +563,8 @@ static ssize_t devkmsg_writev(struct kiocb *iocb, const struct iovec *iv,
line = endp;
}
}
line[len] = '\0';
printk_emit(facility, level, NULL, 0, "%s", line);
out:
kfree(buf);
return ret;
}
@ -802,7 +796,7 @@ static int devkmsg_release(struct inode *inode, struct file *file)
const struct file_operations kmsg_fops = {
.open = devkmsg_open,
.read = devkmsg_read,
.aio_write = devkmsg_writev,
.write_iter = devkmsg_write,
.llseek = devkmsg_llseek,
.poll = devkmsg_poll,
.release = devkmsg_release,