Commit 815a4bb1 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'arc-fixes-for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc 

Pull ARC Fixes from Vineet Gupta:
 - Handle unaligned access in zero delay loops
 - spinlock livelock fix for SMP systemC model
 - fix 32bit overflow in access_ok
 - better setup of clockevents

* tag 'arc-fixes-for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
  ARC: Use clockevents_config_and_register over clockevents_register_device
  ARC: Workaround spinlock livelock in SMP SystemC simulation
  ARC: Fix 32-bit wrap around in access_ok()
  ARC: Handle zero-overhead-loop in unaligned access handler
parents 15c03dd4 55c2e262

arch/arc/include/asm/spinlock.h

+8 −1
Original line number Diff line number Diff line
@@ -45,7 +45,14 @@ static inline int arch_spin_trylock(arch_spinlock_t *lock) 


static inline void arch_spin_unlock(arch_spinlock_t *lock)

{

	lock->slock = __ARCH_SPIN_LOCK_UNLOCKED__;

	unsigned int tmp = __ARCH_SPIN_LOCK_UNLOCKED__;



	__asm__ __volatile__(

	"	ex  %0, [%1]		\n"

	: "+r" (tmp)

	: "r"(&(lock->slock))

	: "memory");



	smp_mb();

}

arch/arc/include/asm/uaccess.h

+2 −2
Original line number Diff line number Diff line
@@ -53,7 +53,7 @@ 
 *

 */

#define __user_ok(addr, sz)	(((sz) <= TASK_SIZE) && \

				 (((addr)+(sz)) <= get_fs()))

				 ((addr) <= (get_fs() - (sz))))

#define __access_ok(addr, sz)	(unlikely(__kernel_ok) || \

				 likely(__user_ok((addr), (sz))))

arch/arc/kernel/time.c

+2 −5
Original line number Diff line number Diff line
@@ -227,12 +227,9 @@ void __attribute__((weak)) arc_local_timer_setup(unsigned int cpu) 
{

	struct clock_event_device *clk = &per_cpu(arc_clockevent_device, cpu);



	clockevents_calc_mult_shift(clk, arc_get_core_freq(), 5);



	clk->max_delta_ns = clockevent_delta2ns(ARC_TIMER_MAX, clk);

	clk->cpumask = cpumask_of(cpu);



	clockevents_register_device(clk);

	clockevents_config_and_register(clk, arc_get_core_freq(),

					0, ARC_TIMER_MAX);



	/*

	 * setup the per-cpu timer IRQ handler - for all cpus

arch/arc/kernel/unaligned.c

+6 −0
Original line number Diff line number Diff line
@@ -245,6 +245,12 @@ int misaligned_fixup(unsigned long address, struct pt_regs *regs, 
		regs->status32 &= ~STATUS_DE_MASK;

	} else {

		regs->ret += state.instr_len;



		/* handle zero-overhead-loop */

		if ((regs->ret == regs->lp_end) && (regs->lp_count)) {

			regs->ret = regs->lp_start;

			regs->lp_count--;

		}

	}



	return 0;

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