[PATCH] Make /proc/kcore configurable

This allows /proc/kcore to be entirely disabled and dropped out of the
kernel - we already select between a.out and ELF.

Right now it only drops /proc/kcore out of the kernel for ARM.

fs/Kconfig

@@ -761,6 +761,10 @@ config PROC_FS
 	  This option will enlarge your kernel by about 67 KB. Several
 	  programs depend on this, so everyone should say Y here.
 
+config PROC_KCORE
+	bool
+	default y if !ARM
+
 config DEVFS_FS
 	bool "/dev file system support (EXPERIMENTAL)"
 	depends on EXPERIMENTAL

fs/proc/Makefile

@@ -8,6 +8,7 @@ proc-y			:= task_nommu.o
 proc-$(CONFIG_MMU)	:= task_mmu.o
 
 proc-y       += inode.o root.o base.o generic.o array.o \
-		kmsg.o proc_tty.o proc_misc.o kcore.o
+		kmsg.o proc_tty.o proc_misc.o
 
+proc-$(CONFIG_PROC_KCORE)	+= kcore.o
 proc-$(CONFIG_PROC_DEVICETREE)	+= proc_devtree.o

fs/proc/proc_misc.c

@@ -685,12 +685,14 @@ void __init proc_misc_init(void)
 #ifdef CONFIG_MODULES
 	create_seq_entry("modules", 0, &proc_modules_operations);
 #endif
+#ifdef CONFIG_PROC_KCORE
 	proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
 	if (proc_root_kcore) {
 		proc_root_kcore->proc_fops = &proc_kcore_operations;
 		proc_root_kcore->size =
 				(size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
 	}
+#endif
 	if (prof_on) {
 		entry = create_proc_entry("profile", S_IWUSR | S_IRUGO, NULL);
 		if (entry) {