6 files changed, 87 insertions, 30 deletions

diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 146a434ba944..987c773dbb20 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -28,6 +28,7 @@ do {						\
         (vmi)->largest_chunk = 0;               \
 } while(0)
 
+extern int nommu_vma_show(struct seq_file *, struct vm_area_struct *);
 #endif
 
 extern void create_seq_entry(char *name, mode_t mode, const struct file_operations *f);
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index 6a984f64edd7..3ceff3857272 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -279,12 +279,11 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
                 tsz = elf_buflen - *fpos;
                 if (buflen < tsz)
                         tsz = buflen;
-                elf_buf = kmalloc(elf_buflen, GFP_ATOMIC);
+                elf_buf = kzalloc(elf_buflen, GFP_ATOMIC);
                 if (!elf_buf) {
                         read_unlock(&kclist_lock);
                         return -ENOMEM;
                 }
-                memset(elf_buf, 0, elf_buflen);
                 elf_kcore_store_hdr(elf_buf, nphdr, elf_buflen);
                 read_unlock(&kclist_lock);
                 if (copy_to_user(buffer, elf_buf + *fpos, tsz)) {
@@ -330,10 +329,9 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
                         unsigned long curstart = start;
                         unsigned long cursize = tsz;
 
-                        elf_buf = kmalloc(tsz, GFP_KERNEL);
+                        elf_buf = kzalloc(tsz, GFP_KERNEL);
                         if (!elf_buf)
                                 return -ENOMEM;
-                        memset(elf_buf, 0, tsz);
 
                         read_lock(&vmlist_lock);
                         for (m=vmlist; m && cursize; m=m->next) {
diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c
index cff10ab1af63..d7dbdf9e0f49 100644
--- a/fs/proc/nommu.c
+++ b/fs/proc/nommu.c
@@ -33,19 +33,15 @@
 #include "internal.h"
 
 /*
- * display a list of all the VMAs the kernel knows about
- * - nommu kernals have a single flat list
+ * display a single VMA to a sequenced file
  */
-static int nommu_vma_list_show(struct seq_file *m, void *v)
+int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
 {
-        struct vm_area_struct *vma;
         unsigned long ino = 0;
         struct file *file;
         dev_t dev = 0;
         int flags, len;
 
-        vma = rb_entry((struct rb_node *) v, struct vm_area_struct, vm_rb);
-
         flags = vma->vm_flags;
         file = vma->vm_file;
 
@@ -78,6 +74,18 @@ static int nommu_vma_list_show(struct seq_file *m, void *v)
         return 0;
 }
 
+/*
+ * display a list of all the VMAs the kernel knows about
+ * - nommu kernals have a single flat list
+ */
+static int nommu_vma_list_show(struct seq_file *m, void *v)
+{
+        struct vm_area_struct *vma;
+
+        vma = rb_entry((struct rb_node *) v, struct vm_area_struct, vm_rb);
+        return nommu_vma_show(m, vma);
+}
+
 static void *nommu_vma_list_start(struct seq_file *m, loff_t *_pos)
 {
         struct rb_node *_rb;
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 942156225447..5bbd60896050 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -157,10 +157,12 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
                 "SwapCached:   %8lu kB\n"
                 "Active:       %8lu kB\n"
                 "Inactive:     %8lu kB\n"
+#ifdef CONFIG_HIGHMEM
                 "HighTotal:    %8lu kB\n"
                 "HighFree:     %8lu kB\n"
                 "LowTotal:     %8lu kB\n"
                 "LowFree:      %8lu kB\n"
+#endif
                 "SwapTotal:    %8lu kB\n"
                 "SwapFree:     %8lu kB\n"
                 "Dirty:        %8lu kB\n"
@@ -168,6 +170,8 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
                 "AnonPages:    %8lu kB\n"
                 "Mapped:       %8lu kB\n"
                 "Slab:         %8lu kB\n"
+                "SReclaimable: %8lu kB\n"
+                "SUnreclaim:   %8lu kB\n"
                 "PageTables:   %8lu kB\n"
                 "NFS_Unstable: %8lu kB\n"
                 "Bounce:       %8lu kB\n"
@@ -183,17 +187,22 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
                 K(total_swapcache_pages),
                 K(active),
                 K(inactive),
+#ifdef CONFIG_HIGHMEM
                 K(i.totalhigh),
                 K(i.freehigh),
                 K(i.totalram-i.totalhigh),
                 K(i.freeram-i.freehigh),
+#endif
                 K(i.totalswap),
                 K(i.freeswap),
                 K(global_page_state(NR_FILE_DIRTY)),
                 K(global_page_state(NR_WRITEBACK)),
                 K(global_page_state(NR_ANON_PAGES)),
                 K(global_page_state(NR_FILE_MAPPED)),
-                K(global_page_state(NR_SLAB)),
+                K(global_page_state(NR_SLAB_RECLAIMABLE) +
+                                global_page_state(NR_SLAB_UNRECLAIMABLE)),
+                K(global_page_state(NR_SLAB_RECLAIMABLE)),
+                K(global_page_state(NR_SLAB_UNRECLAIMABLE)),
                 K(global_page_state(NR_PAGETABLE)),
                 K(global_page_state(NR_UNSTABLE_NFS)),
                 K(global_page_state(NR_BOUNCE)),
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 0a163a4f7764..6b769afac55a 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -122,11 +122,6 @@ struct mem_size_stats
         unsigned long private_dirty;
 };
 
-__attribute__((weak)) const char *arch_vma_name(struct vm_area_struct *vma)
-{
-        return NULL;
-}
-
 static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)
 {
         struct proc_maps_private *priv = m->private;
diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 4616ed50ffcd..091aa8e48e02 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -138,25 +138,63 @@ out:
 }
 
 /*
- * Albert D. Cahalan suggested to fake entries for the traditional
- * sections here.  This might be worth investigating.
+ * display mapping lines for a particular process's /proc/pid/maps
  */
-static int show_map(struct seq_file *m, void *v)
+static int show_map(struct seq_file *m, void *_vml)
 {
-        return 0;
+        struct vm_list_struct *vml = _vml;
+        return nommu_vma_show(m, vml->vma);
 }
+
 static void *m_start(struct seq_file *m, loff_t *pos)
 {
+        struct proc_maps_private *priv = m->private;
+        struct vm_list_struct *vml;
+        struct mm_struct *mm;
+        loff_t n = *pos;
+
+        /* pin the task and mm whilst we play with them */
+        priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
+        if (!priv->task)
+                return NULL;
+
+        mm = get_task_mm(priv->task);
+        if (!mm) {
+                put_task_struct(priv->task);
+                priv->task = NULL;
+                return NULL;
+        }
+
+        down_read(&mm->mmap_sem);
+
+        /* start from the Nth VMA */
+        for (vml = mm->context.vmlist; vml; vml = vml->next)
+                if (n-- == 0)
+                        return vml;
         return NULL;
 }
-static void m_stop(struct seq_file *m, void *v)
+
+static void m_stop(struct seq_file *m, void *_vml)
 {
+        struct proc_maps_private *priv = m->private;
+
+        if (priv->task) {
+                struct mm_struct *mm = priv->task->mm;
+                up_read(&mm->mmap_sem);
+                mmput(mm);
+                put_task_struct(priv->task);
+        }
 }
-static void *m_next(struct seq_file *m, void *v, loff_t *pos)
+
+static void *m_next(struct seq_file *m, void *_vml, loff_t *pos)
 {
-        return NULL;
+        struct vm_list_struct *vml = _vml;
+
+        (*pos)++;
+        return vml ? vml->next : NULL;
 }
-static struct seq_operations proc_pid_maps_op = {
+
+static struct seq_operations proc_pid_maps_ops = {
         .start  = m_start,
         .next   = m_next,
         .stop   = m_stop,
@@ -165,11 +203,19 @@ static struct seq_operations proc_pid_maps_op = {
 
 static int maps_open(struct inode *inode, struct file *file)
 {
-        int ret;
-        ret = seq_open(file, &proc_pid_maps_op);
-        if (!ret) {
-                struct seq_file *m = file->private_data;
-                m->private = NULL;
+        struct proc_maps_private *priv;
+        int ret = -ENOMEM;
+
+        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+        if (priv) {
+                priv->pid = proc_pid(inode);
+                ret = seq_open(file, &proc_pid_maps_ops);
+                if (!ret) {
+                        struct seq_file *m = file->private_data;
+                        m->private = priv;
+                } else {
+                        kfree(priv);
+                }
         }
         return ret;
 }
@@ -178,6 +224,6 @@ struct file_operations proc_maps_operations = {
         .open           = maps_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
-        .release        = seq_release,
+        .release        = seq_release_private,
 };