[PATCH 3/5] proc: somewhat simpler code for /proc/*/cmdline
From: Alexey Dobriyan
Date: Wed Feb 21 2018 - 14:27:59 EST
"final" variable is OK but we can get away with less lines.
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---
fs/proc/base.c | 24 +++++++++---------------
1 file changed, 9 insertions(+), 15 deletions(-)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -337,8 +337,7 @@ 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, 0);
@@ -349,25 +348,20 @@ 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;
}