proc: use %u for pid printing and slightly less stack
PROC_NUMBUF is 13 which is enough for "negative int + \n + \0".
However PIDs and TGIDs are never negative and newline is not a concern,
so use just 10 per integer.
Link: http://lkml.kernel.org/r/20171120203005.GA27743@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Alexander Viro <viro@ftp.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index 96fc702..6b80cd1 100644
--- a/fs/proc/fd.c
+++ b/fs/proc/fd.c
@@ -236,7 +236,7 @@ static int proc_readfd_common(struct file *file, struct dir_context *ctx,
for (fd = ctx->pos - 2;
fd < files_fdtable(files)->max_fds;
fd++, ctx->pos++) {
- char name[PROC_NUMBUF];
+ char name[10 + 1];
int len;
if (!fcheck_files(files, fd))