144beb2f53
The comment on TRACE_ENABLE_INTS is incorrect, and appears to have always been incorrect since the code was merged. It probably came from an original out-of-tree patch. Replace it with something that's correct. Also propagate the message to RECONCILE_IRQ_STATE(), because it's potentially subtle. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/*
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* IRQ flags handling
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*/
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#ifndef _ASM_IRQFLAGS_H
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#define _ASM_IRQFLAGS_H
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#ifndef __ASSEMBLY__
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/*
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* Get definitions for arch_local_save_flags(x), etc.
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*/
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#include <asm/hw_irq.h>
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#else
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#ifdef CONFIG_TRACE_IRQFLAGS
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#ifdef CONFIG_IRQSOFF_TRACER
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/*
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* Since the ftrace irqsoff latency trace checks CALLER_ADDR1,
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* which is the stack frame here, we need to force a stack frame
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* in case we came from user space.
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*/
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#define TRACE_WITH_FRAME_BUFFER(func) \
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mflr r0; \
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stdu r1, -STACK_FRAME_OVERHEAD(r1); \
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std r0, 16(r1); \
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stdu r1, -STACK_FRAME_OVERHEAD(r1); \
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bl func; \
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ld r1, 0(r1); \
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ld r1, 0(r1);
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#else
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#define TRACE_WITH_FRAME_BUFFER(func) \
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bl func;
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#endif
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/*
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* These are calls to C code, so the caller must be prepared for volatiles to
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* be clobbered.
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*/
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#define TRACE_ENABLE_INTS TRACE_WITH_FRAME_BUFFER(trace_hardirqs_on)
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#define TRACE_DISABLE_INTS TRACE_WITH_FRAME_BUFFER(trace_hardirqs_off)
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/*
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* This is used by assembly code to soft-disable interrupts first and
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* reconcile irq state.
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*
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* NB: This may call C code, so the caller must be prepared for volatiles to
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* be clobbered.
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*/
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#define RECONCILE_IRQ_STATE(__rA, __rB) \
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lbz __rA,PACASOFTIRQEN(r13); \
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lbz __rB,PACAIRQHAPPENED(r13); \
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cmpwi cr0,__rA,0; \
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li __rA,0; \
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ori __rB,__rB,PACA_IRQ_HARD_DIS; \
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stb __rB,PACAIRQHAPPENED(r13); \
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beq 44f; \
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stb __rA,PACASOFTIRQEN(r13); \
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TRACE_DISABLE_INTS; \
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44:
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#else
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#define TRACE_ENABLE_INTS
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#define TRACE_DISABLE_INTS
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#define RECONCILE_IRQ_STATE(__rA, __rB) \
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lbz __rA,PACAIRQHAPPENED(r13); \
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li __rB,0; \
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ori __rA,__rA,PACA_IRQ_HARD_DIS; \
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stb __rB,PACASOFTIRQEN(r13); \
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stb __rA,PACAIRQHAPPENED(r13)
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#endif
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#endif
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#endif
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