proc: convert /proc/$PID/auxv to seq_file interface

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 10 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 0e76895f47f5..154bbd353b10 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -205,22 +205,20 @@ static int proc_pid_cmdline(struct task_struct *task, char *buffer)
         return get_cmdline(task, buffer, PAGE_SIZE);
 }
 
-static int proc_pid_auxv(struct task_struct *task, char *buffer)
+static int proc_pid_auxv(struct seq_file *m, struct pid_namespace *ns,
+                         struct pid *pid, struct task_struct *task)
 {
         struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ);
-        int res = PTR_ERR(mm);
         if (mm && !IS_ERR(mm)) {
                 unsigned int nwords = 0;
                 do {
                         nwords += 2;
                 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
-                res = nwords * sizeof(mm->saved_auxv[0]);
-                if (res > PAGE_SIZE)
-                        res = PAGE_SIZE;
-                memcpy(buffer, mm->saved_auxv, res);
+                seq_write(m, mm->saved_auxv, nwords * sizeof(mm->saved_auxv[0]));
                 mmput(mm);
-        }
-        return res;
+                return 0;
+        } else
+                return PTR_ERR(mm);
 }
 
 
@@ -2557,7 +2555,7 @@ static const struct pid_entry tgid_base_stuff[] = {
         DIR("net",        S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
 #endif
         REG("environ",    S_IRUSR, proc_environ_operations),
-        INF("auxv",       S_IRUSR, proc_pid_auxv),
+        ONE("auxv",       S_IRUSR, proc_pid_auxv),
         ONE("status",     S_IRUGO, proc_pid_status),
         ONE("personality", S_IRUSR, proc_pid_personality),
         INF("limits",     S_IRUGO, proc_pid_limits),
@@ -2896,7 +2894,7 @@ static const struct pid_entry tid_base_stuff[] = {
         DIR("fdinfo",    S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
         DIR("ns",        S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
         REG("environ",   S_IRUSR, proc_environ_operations),
-        INF("auxv",      S_IRUSR, proc_pid_auxv),
+        ONE("auxv",      S_IRUSR, proc_pid_auxv),
         ONE("status",    S_IRUGO, proc_pid_status),
         ONE("personality", S_IRUSR, proc_pid_personality),
         INF("limits",    S_IRUGO, proc_pid_limits),