Merge branch 'devel-stable' into devel

Conflicts:
	arch/arm/Kconfig
	arch/arm/include/asm/system.h
	arch/arm/mm/Kconfig

9 files changed, 121 insertions, 23 deletions

diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 6c5cf369183..7ee48e7f8f3 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -523,16 +523,16 @@ ENDPROC(__und_usr)
 /*
  * The out of line fixup for the ldrt above.
  */
-	.section .fixup, "ax"
+	.pushsection .fixup, "ax"
 4:	mov	pc, r9
-	.previous
-	.section __ex_table,"a"
+	.popsection
+	.pushsection __ex_table,"a"
 	.long	1b, 4b
 #if __LINUX_ARM_ARCH__ >= 7
 	.long	2b, 4b
 	.long	3b, 4b
 #endif
-	.previous
+	.popsection
 
 /*
  * Check whether the instruction is a co-processor instruction.
@@ -676,10 +676,10 @@ do_fpe:
  *  lr  = unrecognised FP instruction return address
  */
 
-	.data
+	.pushsection .data
 ENTRY(fp_enter)
 	.word	no_fp
-	.previous
+	.popsection
 
 ENTRY(no_fp)
 	mov	pc, lr
diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c
index c6384276622..0298286ad4a 100644
--- a/arch/arm/kernel/ftrace.c
+++ b/arch/arm/kernel/ftrace.c
@@ -62,15 +62,15 @@ int ftrace_modify_code(unsigned long pc, unsigned char *old_code,
 		"    movne  %0, #2    \n"
 		"3:\n"
 
-		".section .fixup, \"ax\"\n"
+		".pushsection .fixup, \"ax\"\n"
 		"4:  mov  %0, #1  \n"
 		"    b    3b      \n"
-		".previous\n"
+		".popsection\n"
 
-		".section __ex_table, \"a\"\n"
+		".pushsection __ex_table, \"a\"\n"
 		"    .long 1b, 4b \n"
 		"    .long 2b, 4b \n"
-		".previous\n"
+		".popsection\n"
 
 		: "=r"(err), "=r"(replaced)
 		: "r"(pc), "r"(new), "r"(old), "0"(err), "1"(replaced)
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index b7cb45bb91e..3b3d2c80509 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -27,7 +27,6 @@
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
-#include <linux/slab.h>
 #include <linux/random.h>
 #include <linux/smp.h>
 #include <linux/init.h>
diff --git a/arch/arm/kernel/kprobes.c b/arch/arm/kernel/kprobes.c
index 60c62c377fa..2ba7deb3072 100644
--- a/arch/arm/kernel/kprobes.c
+++ b/arch/arm/kernel/kprobes.c
@@ -22,6 +22,7 @@
 #include <linux/kernel.h>
 #include <linux/kprobes.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/stop_machine.h>
 #include <linux/stringify.h>
 #include <asm/traps.h>
@@ -393,6 +394,14 @@ void __kprobes jprobe_return(void)
 		/*
 		 * Setup an empty pt_regs. Fill SP and PC fields as
 		 * they're needed by longjmp_break_handler.
+		 *
+		 * We allocate some slack between the original SP and start of
+		 * our fabricated regs. To be precise we want to have worst case
+		 * covered which is STMFD with all 16 regs so we allocate 2 *
+		 * sizeof(struct_pt_regs)).
+		 *
+		 * This is to prevent any simulated instruction from writing
+		 * over the regs when they are accessing the stack.
 		 */
 		"sub    sp, %0, %1		\n\t"
 		"ldr    r0, ="__stringify(JPROBE_MAGIC_ADDR)"\n\t"
@@ -410,7 +419,7 @@ void __kprobes jprobe_return(void)
 		"ldmia	sp, {r0 - pc}		\n\t"
 		:
 		: "r" (kcb->jprobe_saved_regs.ARM_sp),
-		  "I" (sizeof(struct pt_regs)),
+		  "I" (sizeof(struct pt_regs) * 2),
 		  "J" (offsetof(struct pt_regs, ARM_sp)),
 		  "J" (offsetof(struct pt_regs, ARM_pc)),
 		  "J" (offsetof(struct pt_regs, ARM_cpsr))
diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c
index f28c5e9c51e..c628bdf6c43 100644
--- a/arch/arm/kernel/module.c
+++ b/arch/arm/kernel/module.c
@@ -16,9 +16,9 @@
 #include <linux/mm.h>
 #include <linux/elf.h>
 #include <linux/vmalloc.h>
-#include <linux/slab.h>
 #include <linux/fs.h>
 #include <linux/string.h>
+#include <linux/gfp.h>
 
 #include <asm/pgtable.h>
 #include <asm/sections.h>
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index ba2adefa53f..acf5e6fdb6d 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -16,7 +16,6 @@
 #include <linux/mm.h>
 #include <linux/stddef.h>
 #include <linux/unistd.h>
-#include <linux/slab.h>
 #include <linux/user.h>
 #include <linux/delay.h>
 #include <linux/reboot.h>
@@ -356,7 +355,7 @@ EXPORT_SYMBOL(dump_fpu);
  * the thread function, and r3 points to the exit function.
  */
 extern void kernel_thread_helper(void);
-asm(	".section .text\n"
+asm(	".pushsection .text\n"
 "	.align\n"
 "	.type	kernel_thread_helper, #function\n"
 "kernel_thread_helper:\n"
@@ -364,11 +363,11 @@ asm(	".section .text\n"
 "	mov	lr, r3\n"
 "	mov	pc, r2\n"
 "	.size	kernel_thread_helper, . - kernel_thread_helper\n"
-"	.previous");
+"	.popsection");
 
 #ifdef CONFIG_ARM_UNWIND
 extern void kernel_thread_exit(long code);
-asm(	".section .text\n"
+asm(	".pushsection .text\n"
 "	.align\n"
 "	.type	kernel_thread_exit, #function\n"
 "kernel_thread_exit:\n"
@@ -378,7 +377,7 @@ asm(	".section .text\n"
 "	nop\n"
 "	.fnend\n"
 "	.size	kernel_thread_exit, . - kernel_thread_exit\n"
-"	.previous");
+"	.popsection");
 #else
 #define kernel_thread_exit	do_exit
 #endif
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index e7714f367eb..907d5a620bc 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -18,6 +18,7 @@
 #include <asm/cacheflush.h>
 #include <asm/ucontext.h>
 #include <asm/unistd.h>
+#include <asm/vfp.h>
 
 #include "ptrace.h"
 #include "signal.h"
@@ -175,6 +176,90 @@ static int restore_iwmmxt_context(struct iwmmxt_sigframe *frame)
 
 #endif
 
+#ifdef CONFIG_VFP
+
+static int preserve_vfp_context(struct vfp_sigframe __user *frame)
+{
+	struct thread_info *thread = current_thread_info();
+	struct vfp_hard_struct *h = &thread->vfpstate.hard;
+	const unsigned long magic = VFP_MAGIC;
+	const unsigned long size = VFP_STORAGE_SIZE;
+	int err = 0;
+
+	vfp_sync_hwstate(thread);
+	__put_user_error(magic, &frame->magic, err);
+	__put_user_error(size, &frame->size, err);
+
+	/*
+	 * Copy the floating point registers. There can be unused
+	 * registers see asm/hwcap.h for details.
+	 */
+	err |= __copy_to_user(&frame->ufp.fpregs, &h->fpregs,
+			      sizeof(h->fpregs));
+	/*
+	 * Copy the status and control register.
+	 */
+	__put_user_error(h->fpscr, &frame->ufp.fpscr, err);
+
+	/*
+	 * Copy the exception registers.
+	 */
+	__put_user_error(h->fpexc, &frame->ufp_exc.fpexc, err);
+	__put_user_error(h->fpinst, &frame->ufp_exc.fpinst, err);
+	__put_user_error(h->fpinst2, &frame->ufp_exc.fpinst2, err);
+
+	return err ? -EFAULT : 0;
+}
+
+static int restore_vfp_context(struct vfp_sigframe __user *frame)
+{
+	struct thread_info *thread = current_thread_info();
+	struct vfp_hard_struct *h = &thread->vfpstate.hard;
+	unsigned long magic;
+	unsigned long size;
+	unsigned long fpexc;
+	int err = 0;
+
+	__get_user_error(magic, &frame->magic, err);
+	__get_user_error(size, &frame->size, err);
+
+	if (err)
+		return -EFAULT;
+	if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE)
+		return -EINVAL;
+
+	/*
+	 * Copy the floating point registers. There can be unused
+	 * registers see asm/hwcap.h for details.
+	 */
+	err |= __copy_from_user(&h->fpregs, &frame->ufp.fpregs,
+				sizeof(h->fpregs));
+	/*
+	 * Copy the status and control register.
+	 */
+	__get_user_error(h->fpscr, &frame->ufp.fpscr, err);
+
+	/*
+	 * Sanitise and restore the exception registers.
+	 */
+	__get_user_error(fpexc, &frame->ufp_exc.fpexc, err);
+	/* Ensure the VFP is enabled. */
+	fpexc |= FPEXC_EN;
+	/* Ensure FPINST2 is invalid and the exception flag is cleared. */
+	fpexc &= ~(FPEXC_EX | FPEXC_FP2V);
+	h->fpexc = fpexc;
+
+	__get_user_error(h->fpinst, &frame->ufp_exc.fpinst, err);
+	__get_user_error(h->fpinst2, &frame->ufp_exc.fpinst2, err);
+
+	if (!err)
+		vfp_flush_hwstate(thread);
+
+	return err ? -EFAULT : 0;
+}
+
+#endif
+
 /*
  * Do a signal return; undo the signal stack.  These are aligned to 64-bit.
  */
@@ -233,8 +318,8 @@ static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf)
 		err |= restore_iwmmxt_context(&aux->iwmmxt);
 #endif
 #ifdef CONFIG_VFP
-//	if (err == 0)
-//		err |= vfp_restore_state(&sf->aux.vfp);
+	if (err == 0)
+		err |= restore_vfp_context(&aux->vfp);
 #endif
 
 	return err;
@@ -348,8 +433,8 @@ setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set)
 		err |= preserve_iwmmxt_context(&aux->iwmmxt);
 #endif
 #ifdef CONFIG_VFP
-//	if (err == 0)
-//		err |= vfp_save_state(&sf->aux.vfp);
+	if (err == 0)
+		err |= preserve_vfp_context(&aux->vfp);
 #endif
 	__put_user_error(0, &aux->end_magic, err);
 
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 7a3cc026693..b8c3d0f689d 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -86,6 +86,12 @@ int __cpuinit __cpu_up(unsigned int cpu)
 			return PTR_ERR(idle);
 		}
 		ci->idle = idle;
+	} else {
+		/*
+		 * Since this idle thread is being re-used, call
+		 * init_idle() to reinitialize the thread structure.
+		 */
+		init_idle(idle, cpu);
 	}
 
 	/*
diff --git a/arch/arm/kernel/sys_arm.c b/arch/arm/kernel/sys_arm.c
index 4350f75e578..c23501842b9 100644
--- a/arch/arm/kernel/sys_arm.c
+++ b/arch/arm/kernel/sys_arm.c
@@ -15,7 +15,6 @@
 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
-#include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/sem.h>
 #include <linux/msg.h>
@@ -27,6 +26,7 @@
 #include <linux/file.h>
 #include <linux/ipc.h>
 #include <linux/uaccess.h>
+#include <linux/slab.h>
 
 /* Fork a new task - this creates a new program thread.
  * This is called indirectly via a small wrapper