[PATCH 6.6.y 1/4] perf/x86/amd: Ensure amd_pmu_core_disable_all() is always inlined

[Leon Hwang <leon.hwang@linux.dev>]

[ Upstream commit 0dbf66fa7e80024629f816c2ec7a9f3d39637822 ]

In the following patches we will enable LBR capture on AMD CPUs at
arbitrary point in time, which means that LBR recording won't be frozen
by hardware automatically as part of hardware overflow event. So we need
to take care to minimize amount of branches and function calls/returns
on the path to freezing LBR, minimizing LBR snapshot altering as much as
possible.

amd_pmu_core_disable_all() is one of the functions on this path, and is
already marked as __always_inline. But it calls amd_pmu_set_global_ctl()
which is marked as just inline.  So to guarantee no function call will
be generated thoughout mark amd_pmu_set_global_ctl() as __always_inline
as well.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Sandipan Das <sandipan.das@amd.com>
Link: https://lore.kernel.org/r/20240402022118.1046049-2-andrii@kernel.org
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
---
 arch/x86/events/amd/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index aa8fc2cf1bde..3b09ec4f2b0d 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -632,7 +632,7 @@ static void amd_pmu_cpu_dead(int cpu)
 	}
 }
 
-static inline void amd_pmu_set_global_ctl(u64 ctl)
+static __always_inline void amd_pmu_set_global_ctl(u64 ctl)
 {
 	wrmsrl(MSR_AMD64_PERF_CNTR_GLOBAL_CTL, ctl);
 }
-- 
2.52.0