linux-kernel - Re: [PATCH 2/2 v2] perf tools: Enable bpf prologue for arm64

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Message-ID: <20170125133201.GC27026@arm.com>
Date:   Wed, 25 Jan 2017 13:32:01 +0000
From:   Will Deacon <will.deacon@....com>
To:     He Kuang <hekuang@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        mhiramat@...nel.org, wangnan0@...wei.com, bintian.wang@...wei.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2 v2] perf tools: Enable bpf prologue for arm64

On Wed, Jan 25, 2017 at 07:23:11AM +0000, He Kuang wrote:
> Since HAVE_KPROBES can be enabled in arm64, this patch introduces
> regs_query_register_offset() to convert register name to offset for
> arm64, so the BPF prologue feature is ready to use.
> 
> This patch also changes the 'dwarfnum' to 'offset' in register table,
> so the related functions are consistent with x86.

Wouldn't it be an awful lot simpler just to leave the code as-is, and
implement regs_query_register_offset in the same way that we implement
get_arch_regstr but return the dwarfnum?

I don't really see the point of all the refactoring.

Will