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powerpc: Update comments in irqflags.h

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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>
This commit is contained in:
Michael Ellerman 2014-07-15 21:15:36 +10:00 committed by Benjamin Herrenschmidt
parent 4e2bf01b21
commit 144beb2f53
1 changed files with 5 additions and 3 deletions
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8
arch/powerpc/include/asm/irqflags.h
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@ -32,9 +32,8 @@
#endif
/*
* Most of the CPU's IRQ-state tracing is done from assembly code; we
* have to call a C function so call a wrapper that saves all the
* C-clobbered registers.
* These are calls to C code, so the caller must be prepared for volatiles to
* be clobbered.
*/
#define TRACE_ENABLE_INTS TRACE_WITH_FRAME_BUFFER(trace_hardirqs_on)
#define TRACE_DISABLE_INTS TRACE_WITH_FRAME_BUFFER(trace_hardirqs_off)
@ -42,6 +41,9 @@
/*
* This is used by assembly code to soft-disable interrupts first and
* reconcile irq state.
*
* NB: This may call C code, so the caller must be prepared for volatiles to
* be clobbered.
*/
#define RECONCILE_IRQ_STATE(__rA, __rB) \
lbz __rA,PACASOFTIRQEN(r13); \