Merge tag 'v3.8-rc7' into next

Linux 3.8-rc7

* tag 'v3.8-rc7': (12052 commits)
  Linux 3.8-rc7
  net: sctp: sctp_endpoint_free: zero out secret key data
  net: sctp: sctp_setsockopt_auth_key: use kzfree instead of kfree
  atm/iphase: rename fregt_t -> ffreg_t
  ARM: 7641/1: memory: fix broken mmap by ensuring TASK_UNMAPPED_BASE is aligned
  ARM: DMA mapping: fix bad atomic test
  ARM: realview: ensure that we have sufficient IRQs available
  ARM: GIC: fix GIC cpumask initialization
  net: usb: fix regression from FLAG_NOARP code
  l2tp: dont play with skb->truesize
  net: sctp: sctp_auth_key_put: use kzfree instead of kfree
  netback: correct netbk_tx_err to handle wrap around.
  xen/netback: free already allocated memory on failure in xen_netbk_get_requests
  xen/netback: don't leak pages on failure in xen_netbk_tx_check_gop.
  xen/netback: shutdown the ring if it contains garbage.
  drm/ttm: fix fence locking in ttm_buffer_object_transfer, 2nd try
  virtio_console: Don't access uninitialized data.
  net: qmi_wwan: add more Huawei devices, including E320
  net: cdc_ncm: add another Huawei vendor specific device
  ipv6/ip6_gre: fix error case handling in ip6gre_tunnel_xmit()
  ...

1 files changed, 8 insertions, 7 deletions

diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index a03bf00a1a9c..47c77e7ffbf8 100644
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -171,16 +171,17 @@ static int isBranchInstr(mips_instruction * i)
  * In the Linux kernel, we support selection of FPR format on the
  * basis of the Status.FR bit.  If an FPU is not present, the FR bit
  * is hardwired to zero, which would imply a 32-bit FPU even for
- * 64-bit CPUs.  For 64-bit kernels with no FPU we use TIF_32BIT_REGS
- * as a proxy for the FR bit so that a 64-bit FPU is emulated.  In any
- * case, for a 32-bit kernel which uses the O32 MIPS ABI, only the
- * even FPRs are used (Status.FR = 0).
+ * 64-bit CPUs so we rather look at TIF_32BIT_REGS.
+ * FPU emu is slow and bulky and optimizing this function offers fairly
+ * sizeable benefits so we try to be clever and make this function return
+ * a constant whenever possible, that is on 64-bit kernels without O32
+ * compatibility enabled and on 32-bit kernels.
  */
 static inline int cop1_64bit(struct pt_regs *xcp)
 {
-	if (cpu_has_fpu)
-		return xcp->cp0_status & ST0_FR;
-#ifdef CONFIG_64BIT
+#if defined(CONFIG_64BIT) && !defined(CONFIG_MIPS32_O32)
+	return 1;
+#elif defined(CONFIG_64BIT) && defined(CONFIG_MIPS32_O32)
 	return !test_thread_flag(TIF_32BIT_REGS);
 #else
 	return 0;