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

* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus:
  [MIPS] Kconfig: Move missplaced NR_CPUS default from SMTC to VSMP.
  [MIPS] Lockdep: Fix recursion bug.
  [MIPS] RTLX: Handle copy_*_user return values.
  [MIPS] RTLX: Protect rtlx_{read,write} with mutex.
  [MIPS] RTLX: Harden against compiler reordering and optimization.
  [MIPS] RTLX: Don't use volatile; it's fragile.
  [MIPS] Lasat: Downgrade 64-bit kernel from experimental to broken.
  [MIPS] Compat: Fix build if CONFIG_SYSVIPC is disabled.
  [CHAR] lcd: Fix two warnings.
  [MIPS] FPU ownership management & preemption fixes
  [MIPS] Check FCSR for pending interrupts, alternative version
  [MIPS] IP27, IP35: Fix warnings.

10 files changed, 96 insertions, 57 deletions

diff --git a/include/asm-mips/atomic.h b/include/asm-mips/atomic.h
index 8578869a8bc..1ac50b6c47a 100644
--- a/include/asm-mips/atomic.h
+++ b/include/asm-mips/atomic.h
@@ -79,9 +79,9 @@ static __inline__ void atomic_add(int i, atomic_t * v)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		v->counter += i;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 }
 
@@ -124,9 +124,9 @@ static __inline__ void atomic_sub(int i, atomic_t * v)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		v->counter -= i;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 }
 
@@ -173,11 +173,11 @@ static __inline__ int atomic_add_return(int i, atomic_t * v)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		result = v->counter;
 		result += i;
 		v->counter = result;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 
 	smp_mb();
@@ -225,11 +225,11 @@ static __inline__ int atomic_sub_return(int i, atomic_t * v)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		result = v->counter;
 		result -= i;
 		v->counter = result;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 
 	smp_mb();
@@ -293,12 +293,12 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		result = v->counter;
 		result -= i;
 		if (result >= 0)
 			v->counter = result;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 
 	smp_mb();
@@ -454,9 +454,9 @@ static __inline__ void atomic64_add(long i, atomic64_t * v)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		v->counter += i;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 }
 
@@ -499,9 +499,9 @@ static __inline__ void atomic64_sub(long i, atomic64_t * v)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		v->counter -= i;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 }
 
@@ -548,11 +548,11 @@ static __inline__ long atomic64_add_return(long i, atomic64_t * v)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		result = v->counter;
 		result += i;
 		v->counter = result;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 
 	smp_mb();
@@ -600,11 +600,11 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		result = v->counter;
 		result -= i;
 		v->counter = result;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 
 	smp_mb();
@@ -668,12 +668,12 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		result = v->counter;
 		result -= i;
 		if (result >= 0)
 			v->counter = result;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 
 	smp_mb();
diff --git a/include/asm-mips/bitops.h b/include/asm-mips/bitops.h
index 8959da245cf..d995413e11f 100644
--- a/include/asm-mips/bitops.h
+++ b/include/asm-mips/bitops.h
@@ -100,9 +100,9 @@ static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
 
 		a += nr >> SZLONG_LOG;
 		mask = 1UL << bit;
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		*a |= mask;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 }
 
@@ -165,9 +165,9 @@ static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
 
 		a += nr >> SZLONG_LOG;
 		mask = 1UL << bit;
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		*a &= ~mask;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 }
 
@@ -220,9 +220,9 @@ static inline void change_bit(unsigned long nr, volatile unsigned long *addr)
 
 		a += nr >> SZLONG_LOG;
 		mask = 1UL << bit;
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		*a ^= mask;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 	}
 }
 
@@ -287,10 +287,10 @@ static inline int test_and_set_bit(unsigned long nr,
 
 		a += nr >> SZLONG_LOG;
 		mask = 1UL << bit;
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		retval = (mask & *a) != 0;
 		*a |= mask;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 
 		return retval;
 	}
@@ -381,10 +381,10 @@ static inline int test_and_clear_bit(unsigned long nr,
 
 		a += nr >> SZLONG_LOG;
 		mask = 1UL << bit;
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		retval = (mask & *a) != 0;
 		*a &= ~mask;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 
 		return retval;
 	}
@@ -452,10 +452,10 @@ static inline int test_and_change_bit(unsigned long nr,
 
 		a += nr >> SZLONG_LOG;
 		mask = 1UL << bit;
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		retval = (mask & *a) != 0;
 		*a ^= mask;
-		local_irq_restore(flags);
+		raw_local_irq_restore(flags);
 
 		return retval;
 	}
diff --git a/include/asm-mips/cpu-features.h b/include/asm-mips/cpu-features.h
index eadca266f15..5e4bed123b4 100644
--- a/include/asm-mips/cpu-features.h
+++ b/include/asm-mips/cpu-features.h
@@ -40,6 +40,9 @@
 #endif
 #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)
+#else
+#define raw_cpu_has_fpu		cpu_has_fpu
 #endif
 #ifndef cpu_has_32fpr
 #define cpu_has_32fpr		(cpu_data[0].options & MIPS_CPU_32FPR)
diff --git a/include/asm-mips/cpu-info.h b/include/asm-mips/cpu-info.h
index 610d0cdeaa9..22fe8453fcc 100644
--- a/include/asm-mips/cpu-info.h
+++ b/include/asm-mips/cpu-info.h
@@ -87,6 +87,7 @@ struct cpuinfo_mips {
 
 extern struct cpuinfo_mips cpu_data[];
 #define current_cpu_data cpu_data[smp_processor_id()]
+#define raw_current_cpu_data cpu_data[raw_smp_processor_id()]
 
 extern void cpu_probe(void);
 extern void cpu_report(void);
diff --git a/include/asm-mips/fpu.h b/include/asm-mips/fpu.h
index efef843b93f..4e12d1f9534 100644
--- a/include/asm-mips/fpu.h
+++ b/include/asm-mips/fpu.h
@@ -27,11 +27,11 @@
 struct sigcontext;
 struct sigcontext32;
 
-extern asmlinkage int (*save_fp_context)(struct sigcontext *sc);
-extern asmlinkage int (*restore_fp_context)(struct sigcontext *sc);
+extern asmlinkage int (*save_fp_context)(struct sigcontext __user *sc);
+extern asmlinkage int (*restore_fp_context)(struct sigcontext __user *sc);
 
-extern asmlinkage int (*save_fp_context32)(struct sigcontext32 *sc);
-extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 *sc);
+extern asmlinkage int (*save_fp_context32)(struct sigcontext32 __user *sc);
+extern asmlinkage int (*restore_fp_context32)(struct sigcontext32 __user *sc);
 
 extern void fpu_emulator_init_fpu(void);
 extern void _init_fpu(void);
@@ -68,6 +68,8 @@ do {									\
 	/* We don't care about the c0 hazard here  */			\
 } while (0)
 
+#define __fpu_enabled()	(read_c0_status() & ST0_CU1)
+
 #define enable_fpu()							\
 do {									\
 	if (cpu_has_fpu)						\
@@ -93,31 +95,47 @@ static inline int is_fpu_owner(void)
 	return cpu_has_fpu && __is_fpu_owner();
 }
 
-static inline void own_fpu(void)
+static inline void __own_fpu(void)
 {
-	if (cpu_has_fpu) {
-		__enable_fpu();
-		KSTK_STATUS(current) |= ST0_CU1;
-		set_thread_flag(TIF_USEDFPU);
+	__enable_fpu();
+	KSTK_STATUS(current) |= ST0_CU1;
+	set_thread_flag(TIF_USEDFPU);
+}
+
+static inline void own_fpu(int restore)
+{
+	preempt_disable();
+	if (cpu_has_fpu && !__is_fpu_owner()) {
+		__own_fpu();
+		if (restore)
+			_restore_fp(current);
 	}
+	preempt_enable();
 }
 
-static inline void lose_fpu(void)
+static inline void lose_fpu(int save)
 {
-	if (cpu_has_fpu) {
+	preempt_disable();
+	if (is_fpu_owner()) {
+		if (save)
+			_save_fp(current);
 		KSTK_STATUS(current) &= ~ST0_CU1;
 		clear_thread_flag(TIF_USEDFPU);
 		__disable_fpu();
 	}
+	preempt_enable();
 }
 
 static inline void init_fpu(void)
 {
+	preempt_disable();
 	if (cpu_has_fpu) {
+		__own_fpu();
 		_init_fpu();
 	} else {
 		fpu_emulator_init_fpu();
 	}
+	preempt_enable();
 }
 
 static inline void save_fp(struct task_struct *tsk)
@@ -144,4 +162,18 @@ static inline fpureg_t *get_fpu_regs(struct task_struct *tsk)
 	return tsk->thread.fpu.fpr;
 }
 
+static inline void enable_fp_in_kernel(void)
+{
+	set_thread_flag(TIF_ALLOW_FP_IN_KERNEL);
+	/* make sure CU1 and FPU ownership are consistent */
+	if (!__is_fpu_owner() && __fpu_enabled())
+		__disable_fpu();
+}
+
+static inline void disable_fp_in_kernel(void)
+{
+	BUG_ON(!__is_fpu_owner() && __fpu_enabled());
+	clear_thread_flag(TIF_ALLOW_FP_IN_KERNEL);
+}
+
 #endif /* _ASM_FPU_H */
diff --git a/include/asm-mips/mach-ip27/dma-coherence.h b/include/asm-mips/mach-ip27/dma-coherence.h
index 659816e200d..3fdbbf68e95 100644
--- a/include/asm-mips/mach-ip27/dma-coherence.h
+++ b/include/asm-mips/mach-ip27/dma-coherence.h
@@ -18,7 +18,8 @@
 
 struct device;
 
-static dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size)
+static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
+	size_t size)
 {
 	dma_addr_t pa = dev_to_baddr(dev, virt_to_phys(addr));
 
@@ -37,7 +38,7 @@ static unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)
 	return dma_addr & (0xffUL << 56);
 }
 
-static void plat_unmap_dma_mem(dma_addr_t dma_addr)
+static inline void plat_unmap_dma_mem(dma_addr_t dma_addr)
 {
 }
 
diff --git a/include/asm-mips/mach-ip32/dma-coherence.h b/include/asm-mips/mach-ip32/dma-coherence.h
index 950be17bbb8..c3f9a6a20eb 100644
--- a/include/asm-mips/mach-ip32/dma-coherence.h
+++ b/include/asm-mips/mach-ip32/dma-coherence.h
@@ -26,7 +26,8 @@ struct device;
 
 #define RAM_OFFSET_MASK 0x3fffffffUL
 
-static dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, size_t size)
+static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
+	size_t size)
 {
 	dma_addr_t pa = virt_to_phys(addr) & RAM_OFFSET_MASK;
 
@@ -59,7 +60,7 @@ static unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)
 	return addr;
 }
 
-static void plat_unmap_dma_mem(dma_addr_t dma_addr)
+static inline void plat_unmap_dma_mem(dma_addr_t dma_addr)
 {
 }
 
diff --git a/include/asm-mips/rtlx.h b/include/asm-mips/rtlx.h
index 59162f74a79..65778c890a6 100644
--- a/include/asm-mips/rtlx.h
+++ b/include/asm-mips/rtlx.h
@@ -23,8 +23,8 @@
 
 extern int rtlx_open(int index, int can_sleep);
 extern int rtlx_release(int index);
-extern ssize_t rtlx_read(int index, void *buff, size_t count, int user);
-extern ssize_t rtlx_write(int index, void *buffer, size_t count, int user);
+extern ssize_t rtlx_read(int index, void __user *buff, size_t count);
+extern ssize_t rtlx_write(int index, const void __user *buffer, size_t count);
 extern unsigned int rtlx_read_poll(int index, int can_sleep);
 extern unsigned int rtlx_write_poll(int index);
 
diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
index 597a3743f6a..290887077e4 100644
--- a/include/asm-mips/system.h
+++ b/include/asm-mips/system.h
@@ -121,10 +121,10 @@ static inline unsigned long __xchg_u32(volatile int * m, unsigned int val)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		retval = *m;
 		*m = val;
-		local_irq_restore(flags);	/* implies memory barrier  */
+		raw_local_irq_restore(flags);	/* implies memory barrier  */
 	}
 
 	smp_mb();
@@ -169,10 +169,10 @@ static inline __u64 __xchg_u64(volatile __u64 * m, __u64 val)
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		retval = *m;
 		*m = val;
-		local_irq_restore(flags);	/* implies memory barrier  */
+		raw_local_irq_restore(flags);	/* implies memory barrier  */
 	}
 
 	smp_mb();
@@ -250,11 +250,11 @@ static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old,
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		retval = *m;
 		if (retval == old)
 			*m = new;
-		local_irq_restore(flags);	/* implies memory barrier  */
+		raw_local_irq_restore(flags);	/* implies memory barrier  */
 	}
 
 	smp_mb();
@@ -304,11 +304,11 @@ static inline unsigned long __cmpxchg_u64(volatile int * m, unsigned long old,
 	} else {
 		unsigned long flags;
 
-		local_irq_save(flags);
+		raw_local_irq_save(flags);
 		retval = *m;
 		if (retval == old)
 			*m = new;
-		local_irq_restore(flags);	/* implies memory barrier  */
+		raw_local_irq_restore(flags);	/* implies memory barrier  */
 	}
 
 	smp_mb();
diff --git a/include/asm-mips/thread_info.h b/include/asm-mips/thread_info.h
index fbcda820447..6cf05f4a4e7 100644
--- a/include/asm-mips/thread_info.h
+++ b/include/asm-mips/thread_info.h
@@ -119,6 +119,7 @@ register struct thread_info *__current_thread_info __asm__("$28");
 #define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE		18
 #define TIF_FREEZE		19
+#define TIF_ALLOW_FP_IN_KERNEL	20
 #define TIF_SYSCALL_TRACE	31	/* syscall trace active */
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)