linux-kernel - Re: [PATCH 19/27] perf tools: Introduce regs_query_register

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Date:	Mon, 14 Sep 2015 18:37:53 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	ast@...mgrid.com, masami.hiramatsu.pt@...achi.com,
	namhyung@...nel.org, a.p.zijlstra@...llo.nl,
	brendan.d.gregg@...il.com, acme@...nel.org, daniel@...earbox.net,
	dsahern@...il.com, hekuang@...wei.com, jolsa@...nel.org,
	lizefan@...wei.com, paulus@...ba.org, xiakaixu@...wei.com,
	pi3orama@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 19/27] perf tools: Introduce regs_query_register_offset()
 for x86

Em Sun, Sep 06, 2015 at 07:13:35AM +0000, Wang Nan escreveu:
> regs_query_register_offset() is a helper function which converts
> register name like "%rax" to offset of a register in 'struct pt_regs',
> which is required by BPF prologue generator. Since the function is
> identical, try to reuse the code in arch/x86/kernel/ptrace.c.
> 
> Comment inside dwarf-regs.c list the differences between this
> implementation and kernel code.
> 
> get_arch_regstr() switches to regoffset_table and the old string table
> is dropped.

Trying to cherry pick this one, but found this problem, trying to fix by
adding the prototype somewhere...


[acme@zoo linux]$ m
make: Entering directory '/home/git/linux/tools/perf'
  BUILD:   Doing 'make -j4' parallel build
  CC       /tmp/build/perf/arch/x86/util/dwarf-regs.o
  CC       /tmp/build/perf/arch/x86/util/intel-pt.o
arch/x86/util/dwarf-regs.c:122:5: error: no previous prototype for
‘regs_query_register_offset’ [-Werror=missing-prototypes]
 int regs_query_register_offset(const char *name)
     ^
cc1: all warnings being treated as errors
/home/git/linux/tools/build/Makefile.build:70: recipe for target
'/tmp/build/perf/arch/x86/util/dwarf-regs.o' failed
make[5]: *** [/tmp/build/perf/arch/x86/util/dwarf-regs.o] Error 1

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