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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2018-06-08 03:09:55 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-08 03:34:38 +0300 |
| commit | 6a6b9c4c11f8da5156b72e868baf0c6c392a5014 (patch) | |
| tree | a82dc9e7a71e6657c9fba7cf6298b0af6a6c9178 /fs/proc | |
| parent | b42262af5ecfc64f92423dc1e5ef634d9195f4b0 (diff) | |
| download | linux-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.c | 24 |
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; } |