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| author | Michael Ellerman <mpe@ellerman.id.au> | 2014-07-15 21:15:36 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-07-28 14:11:23 +1000 |
| commit | 144beb2f53894283e0a8a4e6ef32d42b17fc34fd (patch) | |
| tree | e6fa376a177aa8a79c68501470ea7b99a3e07dd1 | |
| parent | 4e2bf01b21054b9300d2e108f5b8b5e4b803b8b8 (diff) | |
| download | blackbird-op-linux-144beb2f53894283e0a8a4e6ef32d42b17fc34fd.tar.gz blackbird-op-linux-144beb2f53894283e0a8a4e6ef32d42b17fc34fd.zip | |
powerpc: Update comments in irqflags.h
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>
| -rw-r--r-- | arch/powerpc/include/asm/irqflags.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/irqflags.h b/arch/powerpc/include/asm/irqflags.h index e20eb95429a8..f2149066fe5d 100644 --- a/arch/powerpc/include/asm/irqflags.h +++ b/arch/powerpc/include/asm/irqflags.h @@ -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); \ |
