Merge tag 'mips_4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

Pull MIPS updates from Paul Burton:
 "Here's the main MIPS pull for Linux 4.21. Core architecture changes
  include:

   - Syscall tables & definitions for unistd.h are now generated by
     scripts, providing greater consistency with other architectures &
     making it easier to add new syscalls.

   - Support for building kernels with no floating point support, upon
     which any userland attempting to use floating point instructions
     will receive a SIGILL. Mostly useful to shrink the kernel & as
     preparation for nanoMIPS support which does not yet include FP.

   - MIPS SIMD Architecture (MSA) vector register context is now exposed
     by ptrace via a new NT_MIPS_MSA regset.

   - ASIDs are now stored as 64b values even for MIPS32 kernels,
     expanding the ASID version field sufficiently that we don't need to
     worry about overflow & avoiding rare issues with reused ASIDs that
     have been observed in the wild.

   - The branch delay slot "emulation" page is now mapped without write
     permission for the user, preventing its use as a nice location for
     attacks to execute malicious code from.

   - Support for ioremap_prot(), primarily to allow gdb or other ptrace
     users the ability to view their tracee's memory using the same
     cache coherency attribute.

   - Optimizations to more cpu_has_* macros, allowing more to be
     compile-time constant where possible.

   - Enable building the whole kernel with UBSAN instrumentation.

   - Enable building the kernel with link-time dead code & data
     elimination.

  Platform specific changes include:

   - The Boston board gains a workaround for DMA prefetching issues with
     the EG20T Platform Controller Hub that it uses.

   - Cleanups to Cavium Octeon code removing about 20k lines of
     redundant code, mostly unused or duplicate register definitions in
     headers.

   - defconfig updates for the DECstation machines, including new
     defconfigs for r4k & 64b machines.

   - Further work on Loongson 3 support.

   - DMA fixes for SiByte machines"

* tag 'mips_4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (95 commits)
  MIPS: math-emu: Write-protect delay slot emulation pages
  MIPS: Remove struct mm_context_t fp_mode_switching field
  mips: generate uapi header and system call table files
  mips: add system call table generation support
  mips: remove syscall table entries
  mips: add +1 to __NR_syscalls in uapi header
  mips: rename scall64-64.S to scall64-n64.S
  mips: remove unused macros
  mips: add __NR_syscalls along with __NR_Linux_syscalls
  MIPS: Expand MIPS32 ASIDs to 64 bits
  MIPS: OCTEON: delete redundant register definitions
  MIPS: OCTEON: cvmx_gmxx_inf_mode: use oldest forward compatible definition
  MIPS: OCTEON: cvmx_mio_fus_dat3: use oldest forward compatible definition
  MIPS: OCTEON: cvmx_pko_mem_debug8: use oldest forward compatible definition
  MIPS: OCTEON: octeon-usb: use common gpio_bit definition
  MIPS: OCTEON: enable all OCTEON drivers in defconfig
  mips: annotate implicit fall throughs
  MIPS: Hardcode cpu_has_mips* where target ISA allows
  MIPS: MT: Remove norps command line parameter
  MIPS: Only include mmzone.h when CONFIG_NEED_MULTIPLE_NODES=y
  ...

1 files changed, 35 insertions, 25 deletions

diff --git a/arch/mips/include/asm/cpu-features.h b/arch/mips/include/asm/cpu-features.h
index 0edba3e75747..701e525641b8 100644
--- a/arch/mips/include/asm/cpu-features.h
+++ b/arch/mips/include/asm/cpu-features.h
@@ -15,6 +15,7 @@
 #include <cpu-feature-overrides.h>
 
 #define __ase(ase)			(cpu_data[0].ases & (ase))
+#define __isa(isa)			(cpu_data[0].isa_level & (isa))
 #define __opt(opt)			(cpu_data[0].options & (opt))
 
 /*
@@ -53,6 +54,18 @@
 #define __isa_lt_and_opt(isa, opt)	((MIPS_ISA_REV < (isa)) && __opt(opt))
 
 /*
+ * Similarly allow for ISA level checks that take into account knowledge of the
+ * ISA targeted by the kernel build, provided by MIPS_ISA_REV.
+ */
+#define __isa_ge_and_flag(isa, flag)	((MIPS_ISA_REV >= (isa)) && __isa(flag))
+#define __isa_ge_or_flag(isa, flag)	((MIPS_ISA_REV >= (isa)) || __isa(flag))
+#define __isa_lt_and_flag(isa, flag)	((MIPS_ISA_REV < (isa)) && __isa(flag))
+#define __isa_range(ge, lt) \
+	((MIPS_ISA_REV >= (ge)) && (MIPS_ISA_REV < (lt)))
+#define __isa_range_or_flag(ge, lt, flag) \
+	(__isa_range(ge, lt) || ((MIPS_ISA_REV < (lt)) && __isa(flag)))
+
+/*
  * SMP assumption: Options of CPU 0 are a superset of all processors.
  * This is true for all known MIPS systems.
  */
@@ -115,10 +128,15 @@
 #endif
 /* Don't override `cpu_has_fpu' to 1 or the "nofpu" option won't work.  */
 #ifndef cpu_has_fpu
-#define cpu_has_fpu		(current_cpu_data.options & MIPS_CPU_FPU)
-#define raw_cpu_has_fpu		(raw_current_cpu_data.options & MIPS_CPU_FPU)
+# ifdef CONFIG_MIPS_FP_SUPPORT
+#  define cpu_has_fpu		(current_cpu_data.options & MIPS_CPU_FPU)
+#  define raw_cpu_has_fpu	(raw_current_cpu_data.options & MIPS_CPU_FPU)
+# else
+#  define cpu_has_fpu		0
+#  define raw_cpu_has_fpu	0
+# endif
 #else
-#define raw_cpu_has_fpu		cpu_has_fpu
+# define raw_cpu_has_fpu	cpu_has_fpu
 #endif
 #ifndef cpu_has_32fpr
 #define cpu_has_32fpr		__isa_ge_or_opt(1, MIPS_CPU_32FPR)
@@ -195,7 +213,9 @@
 #endif
 
 #ifndef cpu_has_mmips
-# ifdef CONFIG_SYS_SUPPORTS_MICROMIPS
+# if defined(__mips_micromips)
+#  define cpu_has_mmips		1
+# elif defined(CONFIG_SYS_SUPPORTS_MICROMIPS)
 #  define cpu_has_mmips		__opt(MIPS_CPU_MICROMIPS)
 # else
 #  define cpu_has_mmips		0
@@ -246,48 +266,38 @@
 #endif
 #endif
 
-/* __builtin_constant_p(cpu_has_mips_r) && cpu_has_mips_r */
-#if !((defined(cpu_has_mips32r1) && cpu_has_mips32r1) || \
-	  (defined(cpu_has_mips32r2) && cpu_has_mips32r2) || \
-	  (defined(cpu_has_mips32r6) && cpu_has_mips32r6) || \
-	  (defined(cpu_has_mips64r1) && cpu_has_mips64r1) || \
-	  (defined(cpu_has_mips64r2) && cpu_has_mips64r2) || \
-	  (defined(cpu_has_mips64r6) && cpu_has_mips64r6))
-#define CPU_NO_EFFICIENT_FFS 1
-#endif
-
 #ifndef cpu_has_mips_1
-# define cpu_has_mips_1		(!cpu_has_mips_r6)
+# define cpu_has_mips_1		(MIPS_ISA_REV < 6)
 #endif
 #ifndef cpu_has_mips_2
-# define cpu_has_mips_2		(cpu_data[0].isa_level & MIPS_CPU_ISA_II)
+# define cpu_has_mips_2		__isa_lt_and_flag(6, MIPS_CPU_ISA_II)
 #endif
 #ifndef cpu_has_mips_3
-# define cpu_has_mips_3		(cpu_data[0].isa_level & MIPS_CPU_ISA_III)
+# define cpu_has_mips_3		__isa_lt_and_flag(6, MIPS_CPU_ISA_III)
 #endif
 #ifndef cpu_has_mips_4
-# define cpu_has_mips_4		(cpu_data[0].isa_level & MIPS_CPU_ISA_IV)
+# define cpu_has_mips_4		__isa_lt_and_flag(6, MIPS_CPU_ISA_IV)
 #endif
 #ifndef cpu_has_mips_5
-# define cpu_has_mips_5		(cpu_data[0].isa_level & MIPS_CPU_ISA_V)
+# define cpu_has_mips_5		__isa_lt_and_flag(6, MIPS_CPU_ISA_V)
 #endif
 #ifndef cpu_has_mips32r1
-# define cpu_has_mips32r1	(cpu_data[0].isa_level & MIPS_CPU_ISA_M32R1)
+# define cpu_has_mips32r1	__isa_range_or_flag(1, 6, MIPS_CPU_ISA_M32R1)
 #endif
 #ifndef cpu_has_mips32r2
-# define cpu_has_mips32r2	(cpu_data[0].isa_level & MIPS_CPU_ISA_M32R2)
+# define cpu_has_mips32r2	__isa_range_or_flag(2, 6, MIPS_CPU_ISA_M32R2)
 #endif
 #ifndef cpu_has_mips32r6
-# define cpu_has_mips32r6	(cpu_data[0].isa_level & MIPS_CPU_ISA_M32R6)
+# define cpu_has_mips32r6	__isa_ge_or_flag(6, MIPS_CPU_ISA_M32R6)
 #endif
 #ifndef cpu_has_mips64r1
-# define cpu_has_mips64r1	(cpu_data[0].isa_level & MIPS_CPU_ISA_M64R1)
+# define cpu_has_mips64r1	__isa_range_or_flag(1, 6, MIPS_CPU_ISA_M64R1)
 #endif
 #ifndef cpu_has_mips64r2
-# define cpu_has_mips64r2	(cpu_data[0].isa_level & MIPS_CPU_ISA_M64R2)
+# define cpu_has_mips64r2	__isa_range_or_flag(2, 6, MIPS_CPU_ISA_M64R2)
 #endif
 #ifndef cpu_has_mips64r6
-# define cpu_has_mips64r6	(cpu_data[0].isa_level & MIPS_CPU_ISA_M64R6)
+# define cpu_has_mips64r6	__isa_ge_and_flag(6, MIPS_CPU_ISA_M64R6)
 #endif
 
 /*