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From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: adobriyan@gmail.com, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, pmladek@suse.com,
	rostedt@goodmis.org, sergey.senozhatsky@gmail.com,
	andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk
Subject: [PATCH 04/15] print_integer, proc: rewrite /proc/self via print_integer()
Date: Mon, 20 Apr 2020 23:57:32 +0300	[thread overview]
Message-ID: <20200420205743.19964-4-adobriyan@gmail.com> (raw)
In-Reply-To: <20200420205743.19964-1-adobriyan@gmail.com>

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---
 fs/proc/internal.h | 1 +
 fs/proc/self.c     | 8 ++++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 917cc85e3466..8abfd2fa0963 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -13,6 +13,7 @@
 #include <linux/binfmts.h>
 #include <linux/sched/coredump.h>
 #include <linux/sched/task.h>
+#include "../../lib/print-integer.h"
 
 struct ctl_table_header;
 struct mempolicy;
diff --git a/fs/proc/self.c b/fs/proc/self.c
index 57c0a1047250..c8a1662e2cfd 100644
--- a/fs/proc/self.c
+++ b/fs/proc/self.c
@@ -14,15 +14,19 @@ static const char *proc_self_get_link(struct dentry *dentry,
 {
 	struct pid_namespace *ns = proc_pid_ns(inode);
 	pid_t tgid = task_tgid_nr_ns(current, ns);
+	char buf[10 + 1];
+	char *p = buf + sizeof(buf);
 	char *name;
 
 	if (!tgid)
 		return ERR_PTR(-ENOENT);
 	/* max length of unsigned int in decimal + NULL term */
-	name = kmalloc(10 + 1, dentry ? GFP_KERNEL : GFP_ATOMIC);
+	name = kmalloc(sizeof(buf), dentry ? GFP_KERNEL : GFP_ATOMIC);
 	if (unlikely(!name))
 		return dentry ? ERR_PTR(-ENOMEM) : ERR_PTR(-ECHILD);
-	sprintf(name, "%u", tgid);
+	*--p = '\0';
+	p = _print_integer_u32(p, tgid);
+	memcpy(name, p, buf + sizeof(buf) - p);
 	set_delayed_call(done, kfree_link, name);
 	return name;
 }
-- 
2.24.1


  parent reply	other threads:[~2020-04-20 20:58 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-20 20:57 [PATCH 01/15] sched: make nr_running() return "unsigned int" Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 02/15] sched: make nr_iowait_cpu() " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 03/15] print_integer: new and improved way of printing integers Alexey Dobriyan
2020-04-20 21:19   ` Andy Shevchenko
2020-04-20 21:27     ` Andy Shevchenko
2020-04-21  1:54       ` Steven Rostedt
2020-04-21 16:49         ` Alexey Dobriyan
2020-04-21 21:08           ` Steven Rostedt
2020-04-23  3:42           ` Sergey Senozhatsky
2020-04-21 16:31     ` Alexey Dobriyan
2020-04-21 16:59   ` Matthew Wilcox
2020-04-20 20:57 ` Alexey Dobriyan [this message]
2020-04-20 20:57 ` [PATCH 05/15] print_integer, proc: rewrite /proc/thread-self via print_integer() Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 06/15] print_integer, proc: rewrite /proc/loadavg " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 07/15] print_integer, proc: rewrite /proc/stat " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 08/15] print_integer, proc: rewrite /proc/uptime " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 09/15] proc: s/p/tsk/ Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 10/15] print_integer, proc: rewrite /proc/*/fd via print_integer() Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 11/15] print_integer, proc: rewrite /proc/*/stat " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 12/15] print_integer, proc: rewrite /proc/*/statm " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 13/15] print_integer, printf: rewrite num_to_str() " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 14/15] print_integer, printf: rewrite the rest of lib/vsprintf.c " Alexey Dobriyan
2020-04-21  2:01   ` Steven Rostedt
2020-04-20 20:57 ` [PATCH 15/15] print_integer, proc: rewrite /proc/meminfo " Alexey Dobriyan
2020-04-20 21:05 ` [PATCH 01/15] sched: make nr_running() return "unsigned int" Matthew Wilcox
2020-04-21 17:06   ` Alexey Dobriyan

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