[PATCH v2] drivers/perf: riscv: Disable PERF_SAMPLE_BRANCH_* while not supported

[Conor Dooley]

On Tue, Mar 12, 2024 at 01:20:53AM +0000, Pu Lehui wrote:
> From: Pu Lehui <pulehui at huawei.com>
> 
> RISC-V perf driver does not yet support branch sampling. Although the
> specification is in the works [0], it is best to disable such events
> until support is available, otherwise we will get unexpected results.
> Due to this reason, two riscv bpf testcases get_branch_snapshot and
> perf_branches/perf_branches_hw fail.
> 
> Link: https://github.com/riscv/riscv-control-transfer-records [0]
> Fixes: f5bfa23f576f ("RISC-V: Add a perf core library for pmu drivers")
> Signed-off-by: Pu Lehui <pulehui at huawei.com>

Reviewed-by: Conor Dooley <conor.dooley at microchip.com>

Thanks,
Conor.
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