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Subject[PATCH] proc: use unsigned long inside /proc/*/statm
/proc/*/statm code needlessly truncates data from unsigned long to int.
One needs only 8+ TB of RAM to make truncation visible.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

fs/proc/array.c | 6 +++---
fs/proc/internal.h | 3 ++-
fs/proc/task_mmu.c | 5 +++--
fs/proc/task_nommu.c | 7 ++++---
4 files changed, 12 insertions(+), 9 deletions(-)

--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -535,15 +535,15 @@ int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
- int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
+ unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
struct mm_struct *mm = get_task_mm(task);

if (mm) {
size = task_statm(mm, &shared, &text, &data, &resident);
mmput(mm);
}
- seq_printf(m, "%d %d %d %d %d %d %d\n",
- size, resident, shared, text, lib, data, 0);
+ seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
+ size, resident, shared, text, data);

return 0;
}
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -96,7 +96,8 @@ extern spinlock_t proc_subdir_lock;
struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *);
int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir);
unsigned long task_vsize(struct mm_struct *);
-int task_statm(struct mm_struct *, int *, int *, int *, int *);
+unsigned long task_statm(struct mm_struct *,
+ unsigned long *, unsigned long *, unsigned long *, unsigned long *);
void task_mem(struct seq_file *, struct mm_struct *);

static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -66,8 +66,9 @@ unsigned long task_vsize(struct mm_struct *mm)
return PAGE_SIZE * mm->total_vm;
}

-int task_statm(struct mm_struct *mm, int *shared, int *text,
- int *data, int *resident)
+unsigned long task_statm(struct mm_struct *mm,
+ unsigned long *shared, unsigned long *text,
+ unsigned long *data, unsigned long *resident)
{
*shared = get_mm_counter(mm, MM_FILEPAGES);
*text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -92,13 +92,14 @@ unsigned long task_vsize(struct mm_struct *mm)
return vsize;
}

-int task_statm(struct mm_struct *mm, int *shared, int *text,
- int *data, int *resident)
+unsigned long task_statm(struct mm_struct *mm,
+ unsigned long *shared, unsigned long *text,
+ unsigned long *data, unsigned long *resident)
{
struct vm_area_struct *vma;
struct vm_region *region;
struct rb_node *p;
- int size = kobjsize(mm);
+ unsigned long size = kobjsize(mm);

down_read(&mm->mmap_sem);
for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {

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