[PATCH] ARM SMP: reallocate main IRQ handler code registers
By changing r9 -> r8 and r8 to 'tsk' (r9) we are able to remove one instruction from the preempt path. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
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187a51ad11
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@ -144,20 +144,20 @@ __dabt_svc:
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__irq_svc:
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svc_entry irq
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#ifdef CONFIG_PREEMPT
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get_thread_info r8
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ldr r9, [r8, #TI_PREEMPT] @ get preempt count
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add r7, r9, #1 @ increment it
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str r7, [r8, #TI_PREEMPT]
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get_thread_info tsk
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ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
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add r7, r8, #1 @ increment it
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str r7, [tsk, #TI_PREEMPT]
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#endif
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irq_handler
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#ifdef CONFIG_PREEMPT
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ldr r0, [r8, #TI_FLAGS] @ get flags
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ldr r0, [tsk, #TI_FLAGS] @ get flags
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tst r0, #_TIF_NEED_RESCHED
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blne svc_preempt
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preempt_return:
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ldr r0, [r8, #TI_PREEMPT] @ read preempt value
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ldr r0, [tsk, #TI_PREEMPT] @ read preempt value
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str r8, [tsk, #TI_PREEMPT] @ restore preempt count
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teq r0, r7
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str r9, [r8, #TI_PREEMPT] @ restore preempt count
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strne r0, [r0, -r0] @ bug()
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#endif
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ldr r0, [sp, #S_PSR] @ irqs are already disabled
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@ -168,7 +168,7 @@ preempt_return:
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#ifdef CONFIG_PREEMPT
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svc_preempt:
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teq r9, #0 @ was preempt count = 0
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teq r8, #0 @ was preempt count = 0
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ldreq r6, .LCirq_stat
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movne pc, lr @ no
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ldr r0, [r6, #4] @ local_irq_count
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@ -176,9 +176,9 @@ svc_preempt:
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adds r0, r0, r1
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movne pc, lr
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mov r7, #0 @ preempt_schedule_irq
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str r7, [r8, #TI_PREEMPT] @ expects preempt_count == 0
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str r7, [tsk, #TI_PREEMPT] @ expects preempt_count == 0
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1: bl preempt_schedule_irq @ irq en/disable is done inside
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ldr r0, [r8, #TI_FLAGS] @ get new tasks TI_FLAGS
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ldr r0, [tsk, #TI_FLAGS] @ get new tasks TI_FLAGS
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tst r0, #_TIF_NEED_RESCHED
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beq preempt_return @ go again
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b 1b
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@ -338,21 +338,18 @@ __dabt_usr:
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__irq_usr:
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usr_entry irq
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get_thread_info tsk
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#ifdef CONFIG_PREEMPT
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get_thread_info r8
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ldr r9, [r8, #TI_PREEMPT] @ get preempt count
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add r7, r9, #1 @ increment it
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str r7, [r8, #TI_PREEMPT]
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ldr r8, [tsk, #TI_PREEMPT] @ get preempt count
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add r7, r8, #1 @ increment it
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str r7, [tsk, #TI_PREEMPT]
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#endif
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irq_handler
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#ifdef CONFIG_PREEMPT
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ldr r0, [r8, #TI_PREEMPT]
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ldr r0, [tsk, #TI_PREEMPT]
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str r8, [tsk, #TI_PREEMPT]
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teq r0, r7
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str r9, [r8, #TI_PREEMPT]
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strne r0, [r0, -r0]
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mov tsk, r8
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#else
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get_thread_info tsk
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#endif
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mov why, #0
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b ret_to_user
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