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authorAlexey Dobriyan <adobriyan@gmail.com>2018-06-08 03:09:55 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-08 03:34:38 +0300
commit6a6b9c4c11f8da5156b72e868baf0c6c392a5014 (patch)
treea82dc9e7a71e6657c9fba7cf6298b0af6a6c9178 /fs/proc
parentb42262af5ecfc64f92423dc1e5ef634d9195f4b0 (diff)
downloadlinux-6a6b9c4c11f8da5156b72e868baf0c6c392a5014.tar.xz
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>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c24
1 files changed, 9 insertions, 15 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 159abd09b411..4b27e26fc6de 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -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;
}