Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus

Pull MIPS fixes from Ralf Baechle:
 "The pending MIPS fixes for 3.19.  All across the field and nothing
  particularly severe or dramatic"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (23 commits)
  IRQCHIP: mips-gic: Avoid rerouting timer IRQs for smp-cmp
  MIPS: Fix syscall_get_nr for the syscall exit tracing.
  MIPS: elf2ecoff: Ignore PT_MIPS_ABIFLAGS program headers.
  MIPS: elf2ecoff: Rewrite main processing loop to switch.
  MIPS: fork: Fix MSA/FPU/DSP context duplication race
  MIPS: Fix C0_Pagegrain[IEC] support.
  MIPS: traps: Fix inline asm ctc1 missing .set hardfloat
  MIPS: mipsregs.h: Add write_32bit_cp1_register()
  MIPS: Fix kernel lockup or crash after CPU offline/online
  MIPS: OCTEON: fix kernel crash when offlining a CPU
  MIPS: ARC: Fix build error.
  MIPS: IRQ: Fix disable_irq on CPU IRQs
  MIPS: smp-mt,smp-cmp: Enable all HW IRQs on secondary CPUs
  MIPS: Fix restart of indirect syscalls
  MIPS: ELF: fix loading o32 binaries on 64-bit kernels
  MIPS: mips-cm: Fix sparse warnings
  MIPS: Kconfig: Fix recursive dependency.
  MIPS: Compat: Fix build error if CONFIG_MIPS32_COMPAT but no compat ABI.
  MIPS: JZ4740: Fixup #include's (sparse)
  MIPS: Wire up execveat(2).
  ...

1 files changed, 24 insertions, 12 deletions

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index eb76434828e8..85bff5d513e5 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -82,6 +82,30 @@ void flush_thread(void)
 {
 }
 
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+	/*
+	 * Save any process state which is live in hardware registers to the
+	 * parent context prior to duplication. This prevents the new child
+	 * state becoming stale if the parent is preempted before copy_thread()
+	 * gets a chance to save the parent's live hardware registers to the
+	 * child context.
+	 */
+	preempt_disable();
+
+	if (is_msa_enabled())
+		save_msa(current);
+	else if (is_fpu_owner())
+		_save_fp(current);
+
+	save_dsp(current);
+
+	preempt_enable();
+
+	*dst = *src;
+	return 0;
+}
+
 int copy_thread(unsigned long clone_flags, unsigned long usp,
 	unsigned long arg, struct task_struct *p)
 {
@@ -92,18 +116,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 
 	childksp = (unsigned long)task_stack_page(p) + THREAD_SIZE - 32;
 
-	preempt_disable();
-
-	if (is_msa_enabled())
-		save_msa(p);
-	else if (is_fpu_owner())
-		save_fp(p);
-
-	if (cpu_has_dsp)
-		save_dsp(p);
-
-	preempt_enable();
-
 	/* set up new TSS. */
 	childregs = (struct pt_regs *) childksp - 1;
 	/*  Put the stack after the struct pt_regs.  */