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Commit a5cb2366 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'nios2-fixes-v3.19-rc3' of git://git.rocketboards.org/linux-socfpga-next 

Pull arch/nios2 fixes from Ley Foon Tan:

 - fix compilation error when enable CONFIG_PREEMPT

 - initialize cpuinfo.mmu variable supplied by the device tree

* tag 'nios2-fixes-v3.19-rc3' of git://git.rocketboards.org/linux-socfpga-next:
  nios2: Use preempt_schedule_irq
  nios2: Initialize cpuinfo.mmu
parents 6ca793ab 1b0f4492

arch/nios2/kernel/cpuinfo.c

+1 −0
Original line number Diff line number Diff line
@@ -72,6 +72,7 @@ void __init setup_cpuinfo(void) 
	cpuinfo.has_div = fcpu_has(cpu, "altr,has-div");

	cpuinfo.has_mul = fcpu_has(cpu, "altr,has-mul");

	cpuinfo.has_mulx = fcpu_has(cpu, "altr,has-mulx");

	cpuinfo.mmu = fcpu_has(cpu, "altr,has-mmu");



	if (IS_ENABLED(CONFIG_NIOS2_HW_DIV_SUPPORT) && !cpuinfo.has_div)

		err_cpu("DIV");

arch/nios2/kernel/entry.S

+2 −18
Original line number Diff line number Diff line
@@ -365,30 +365,14 @@ ENTRY(ret_from_interrupt) 
	GET_THREAD_INFO	r1

	ldw	r4, TI_PREEMPT_COUNT(r1)

	bne	r4, r0, restore_all



need_resched:

	ldw	r4, TI_FLAGS(r1)		/* ? Need resched set */

	BTBZ	r10, r4, TIF_NEED_RESCHED, restore_all

	ldw	r4, PT_ESTATUS(sp)	/* ? Interrupts off */

	andi	r10, r4, ESTATUS_EPIE

	beq	r10, r0, restore_all

	movia	r4, PREEMPT_ACTIVE

	stw	r4, TI_PREEMPT_COUNT(r1)

	rdctl	r10, status		/* enable intrs again */

	ori	r10, r10 ,STATUS_PIE

	wrctl	status, r10

	PUSH	r1

	call	schedule

	POP	r1

	mov	r4, r0

	stw	r4, TI_PREEMPT_COUNT(r1)

	rdctl	r10, status		/* disable intrs */

	andi	r10, r10, %lo(~STATUS_PIE)

	wrctl	status, r10

	br	need_resched

#else

	br	restore_all

	call	preempt_schedule_irq

#endif

	br	restore_all



/***********************************************************************

 * A few syscall wrappers