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proc: somewhat simpler code for /proc/*/cmdline 

"final" variable is OK but we can get away with less lines.

Link: http://lkml.kernel.org/r/20180221192751.GC28548@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2018-06-07 17:09:55 -07:00 committed by Linus Torvalds
parent b42262af5e
commit 6a6b9c4c11
1 changed files with 9 additions and 15 deletions
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24
fs/proc/base.c
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@ -318,8 +318,7 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
p = cmdline[i].p + pos1;
len = cmdline[i].len - pos1;
while (count > 0 && len > 0) {
unsigned int nr_read, l;
bool final;
unsigned int nr_read, nr_write;
nr_read = min3(count, len, PAGE_SIZE);
nr_read = access_remote_vm(mm, p, page, nr_read, FOLL_ANON);
@ -330,25 +329,20 @@ static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
* Command line can be shorter than whole ARGV
* even if last "marker" byte says it is not.
*/
final = false;
l = strnlen(page, nr_read);
if (l < nr_read) {
nr_read = l;
final = true;
}
nr_write = strnlen(page, nr_read);
if (copy_to_user(buf, page, nr_read)) {
if (copy_to_user(buf, page, nr_write)) {
rv = -EFAULT;
goto out_free_page;
}
p += nr_read;
len -= nr_read;
buf += nr_read;
count -= nr_read;
rv += nr_read;
p += nr_write;
len -= nr_write;
buf += nr_write;
count -= nr_write;
rv += nr_write;
if (final)
if (nr_write < nr_read)
goto out_free_page;
}