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authorNicholas Piggin <npiggin@gmail.com>2021-05-08 20:14:54 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2021-05-12 11:07:38 +1000
commit7058f4b13edd9dd2cb3c5b4fe340d8307dbe0208 (patch)
tree38998010ac1996a0094b3ce424df3902da83a1fa /arch/powerpc
parenta3f1a39a5643d5c5ed3eee4edd933e0ebfeeed6e (diff)
powerpc/pseries: use notrace hcall variant for H_CEDE idle
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
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/include/asm/plpar_wrappers.h6
-rw-r--r--arch/powerpc/platforms/pseries/lpar.c10
2 files changed, 5 insertions, 11 deletions
diff --git a/arch/powerpc/include/asm/plpar_wrappers.h b/arch/powerpc/include/asm/plpar_wrappers.h
index ece84a430701..83e0f701ebc6 100644
--- a/arch/powerpc/include/asm/plpar_wrappers.h
+++ b/arch/powerpc/include/asm/plpar_wrappers.h
@@ -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)
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index d79d7410c320..ad1cec80019b 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -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);