[PATCH 11/13] maps#2: Make /proc/pid/clear_refs option under CONFIG_EMBEDDED

[Matt Mackall <mpm@selenic.com>]

Make /proc/pid/clear_refs option under CONFIG_EMBEDDED

This interface is primarily useful for doing memory profiling and not
much use on deployed embedded boxes. Make it optional. Together with
/proc/pid/smaps, this save a few K.

Signed-off-by: Matt Mackall <mpm@selenic.com>

Index: mm/fs/proc/base.c
===================================================================
--- mm.orig/fs/proc/base.c	2007-04-03 14:50:33.000000000 -0500
+++ mm/fs/proc/base.c	2007-04-03 18:04:59.000000000 -0500
@@ -2000,7 +2000,9 @@ static const struct pid_entry tgid_base_
 	REG("mounts",     S_IRUGO, mounts),
 	REG("mountstats", S_IRUSR, mountstats),
 #ifdef CONFIG_MMU
+#ifdef CONFIG_PROC_CLEAR_REFS
 	REG("clear_refs", S_IWUSR, clear_refs),
+#endif
 #ifdef CONFIG_PROC_SMAPS
 	REG("smaps",      S_IRUGO, smaps),
 #endif
@@ -2285,7 +2287,9 @@ static const struct pid_entry tid_base_s
 	LNK("exe",       exe),
 	REG("mounts",    S_IRUGO, mounts),
 #ifdef CONFIG_MMU
+#ifdef CONFIG_PROC_CLEAR_REFS
 	REG("clear_refs", S_IWUSR, clear_refs),
+#endif
 #ifdef CONFIG_PROC_SMAPS
 	REG("smaps",     S_IRUGO, smaps),
 #endif
Index: mm/fs/proc/task_mmu.c
===================================================================
--- mm.orig/fs/proc/task_mmu.c	2007-04-03 14:50:33.000000000 -0500
+++ mm/fs/proc/task_mmu.c	2007-04-03 18:04:59.000000000 -0500
@@ -424,6 +424,7 @@ const struct file_operations proc_smaps_
 };
 #endif
 
+#ifdef CONFIG_PROC_CLEAR_REFS
 static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
 				unsigned long end, void *private)
 {
@@ -493,6 +494,7 @@ static ssize_t clear_refs_write(struct f
 const struct file_operations proc_clear_refs_operations = {
 	.write		= clear_refs_write,
 };
+#endif
 
 #ifdef CONFIG_NUMA
 extern int show_numa_map(struct seq_file *m, void *v);
Index: mm/init/Kconfig
===================================================================
--- mm.orig/init/Kconfig	2007-04-03 14:50:33.000000000 -0500
+++ mm/init/Kconfig	2007-04-03 18:04:59.000000000 -0500
@@ -593,6 +593,15 @@ config PROC_SMAPS
           shared memory per mapping. Disabling this interface will reduce
           the size of the kernel for small machines.
 
+config PROC_CLEAR_REFS
+	default y
+	bool "Enable /proc/pid/clear_refs support" if EMBEDDED && PROC_FS && MMU
+	help
+	  The /proc/pid/clear_refs interface allows clearing the
+          referenced bits on a process's memory maps to allow monitoring
+          working set size. Disabling this interface will reduce
+          the size of the kernel for small machines.
+
 endmenu		# General setup
 
 config RT_MUTEXES
-
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