[PATCH 5.8 266/464] powerpc/perf: Fix missing is_sier_aviable() during build

[Greg Kroah-Hartman]

From: Madhavan Srinivasan <maddy@xxxxxxxxxxxxx>

[ Upstream commit 3c9450c053f88e525b2db1e6990cdf34d14e7696 ]

Compilation error:
  arch/powerpc/perf/perf_regs.c:80:undefined reference to `.is_sier_available'

Currently is_sier_available() is part of core-book3s.c, which is added
to build based on CONFIG_PPC_PERF_CTRS.

A config with CONFIG_PERF_EVENTS and without CONFIG_PPC_PERF_CTRS will
have a build break because of missing is_sier_available().

In practice it only breaks when CONFIG_FSL_EMB_PERF_EVENT=n because
that also guards the usage of is_sier_available(). That only happens
with CONFIG_PPC_BOOK3E_64=y and CONFIG_FSL_SOC_BOOKE=n.

Patch adds is_sier_available() in asm/perf_event.h to fix the build
break for configs missing CONFIG_PPC_PERF_CTRS.

Fixes: 333804dc3b7a ("powerpc/perf: Update perf_regs structure to include SIER")
Reported-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Signed-off-by: Madhavan Srinivasan <maddy@xxxxxxxxxxxxx>
[mpe: Add detail about CONFIG_FSL_SOC_BOOKE]
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200614083604.302611-1-maddy@xxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 arch/powerpc/include/asm/perf_event.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/include/asm/perf_event.h b/arch/powerpc/include/asm/perf_event.h
index eed3954082fa2..1e8b2e1ec1db6 100644
--- a/arch/powerpc/include/asm/perf_event.h
+++ b/arch/powerpc/include/asm/perf_event.h
@@ -12,6 +12,8 @@
 
 #ifdef CONFIG_PPC_PERF_CTRS
 #include <asm/perf_event_server.h>
+#else
+static inline bool is_sier_available(void) { return false; }
 #endif
 
 #ifdef CONFIG_FSL_EMB_PERF_EVENT
-- 
2.25.1