linux-kernel - [PATCH] fs, proc: remove priv argument from is

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Date:   Fri, 28 Jul 2017 09:58:33 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andy Lutomirski <luto@...capital.net>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: [PATCH] fs, proc: remove priv argument from is_stack

From: Michal Hocko <mhocko@...e.com>

b18cb64ead40 ("fs/proc: Stop trying to report thread stacks") has
removed the priv parameter user in is_stack so the argument is
redundant. Drop it.

Signed-off-by: Michal Hocko <mhocko@...e.com>
---
Hi,
I have sent this trivial cleanup earlier when we were discussing stack
gap issue and it seemed to fall between cracks. I have just rebased it
on top of the current mmotm tree. It is a trivial cleanup. I was also
considering to move it out of task_{no}mmu.c and do a generic helper out
of it but then I just thought it might be more confusing than helpful
so I kept it there with their only users.

 fs/proc/task_mmu.c   | 7 +++----
 fs/proc/task_nommu.c | 5 ++---
 2 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index b836fd61ed87..7f331ce63fc8 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -266,8 +266,7 @@ static int do_maps_open(struct inode *inode, struct file *file,
  * Indicate if the VMA is a stack for the given task; for
  * /proc/PID/maps that is the stack of the main task.
  */
-static int is_stack(struct proc_maps_private *priv,
-		    struct vm_area_struct *vma)
+static int is_stack(struct vm_area_struct *vma)
 {
 	/*
 	 * We make no effort to guess what a given thread considers to be
@@ -341,7 +340,7 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
 			goto done;
 		}
 
-		if (is_stack(priv, vma))
+		if (is_stack(vma))
 			name = "[stack]";
 	}
 
@@ -1670,7 +1669,7 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid)
 		seq_file_path(m, file, "\n\t= ");
 	} else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
 		seq_puts(m, " heap");
-	} else if (is_stack(proc_priv, vma)) {
+	} else if (is_stack(vma)) {
 		seq_puts(m, " stack");
 	}
 
diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 23266694db11..dea90b566a6e 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -125,8 +125,7 @@ unsigned long task_statm(struct mm_struct *mm,
 	return size;
 }
 
-static int is_stack(struct proc_maps_private *priv,
-		    struct vm_area_struct *vma)
+static int is_stack(struct vm_area_struct *vma)
 {
 	struct mm_struct *mm = vma->vm_mm;
 
@@ -178,7 +177,7 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
 	if (file) {
 		seq_pad(m, ' ');
 		seq_file_path(m, file, "");
-	} else if (mm && is_stack(priv, vma)) {
+	} else if (mm && is_stack(vma)) {
 		seq_pad(m, ' ');
 		seq_printf(m, "[stack]");
 	}
-- 
2.13.2