csky: Add perf callchain support
This patch add support for perf callchain sampling on csky platform. As fp is used to unwind the stack, the program being sampled and the C library need to be compiled with -mbacktrace for user callchains, kernel callchains require CONFIG_STACKTRACE = y. Changelog: - Coding convention with Christoph's advice for riscv's. Signed-off-by: NMao Han <han_mao@c-sky.com> Signed-off-by: NGuo Ren <ren_guo@c-sky.com> Cc: Christoph Hellwig <hch@infradead.org>
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arch/csky/kernel/perf_callchain.c
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