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powerpc/pseries: use notrace hcall variant for H_CEDE idle

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Rather than special-case H_CEDE in the hcall trace wrappers, make the
idle H_CEDE call use plpar_hcall_norets_notrace().

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210508101455.1578318-4-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-05-08 20:14:54 +10:00 committed by Michael Ellerman
parent a3f1a39a56
commit 7058f4b13e
2 changed files with 5 additions and 11 deletions
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6
arch/powerpc/include/asm/plpar_wrappers.h
View file

@ -28,7 +28,11 @@ static inline void set_cede_latency_hint(u8 latency_hint)
static inline long cede_processor(void)
{
return plpar_hcall_norets(H_CEDE);
/*
* We cannot call tracepoints inside RCU idle regions which
* means we must not trace H_CEDE.
*/
return plpar_hcall_norets_notrace(H_CEDE);
}
static inline long extended_cede_processor(unsigned long latency_hint)

10
arch/powerpc/platforms/pseries/lpar.c
View file

@ -1840,13 +1840,6 @@ notrace void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
unsigned long flags;
unsigned int *depth;
/*
* We cannot call tracepoints inside RCU idle regions which
* means we must not trace H_CEDE.
*/
if (opcode == H_CEDE)
return;
local_irq_save(flags);
depth = this_cpu_ptr(&hcall_trace_depth);
@ -1868,9 +1861,6 @@ notrace void __trace_hcall_exit(long opcode, long retval, unsigned long *retbuf)
unsigned long flags;
unsigned int *depth;
if (opcode == H_CEDE)
return;
local_irq_save(flags);
depth = this_cpu_ptr(&hcall_trace_depth);