linux-kernel - Re: [PATCH] scripts/faddr2line: show the code context

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Date:   Mon, 4 Jun 2018 10:10:06 +0800
From:   "Du, Changbin" <changbin.du@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     changbin.du@...el.com, akpm@...ux-foundation.org,
        tglx@...utronix.de, pombredanne@...b.com, neilb@...e.com,
        linux-kernel@...r.kernel.org, jpoimboe@...hat.com
Subject: Re: [PATCH] scripts/faddr2line: show the code context

On Tue, May 29, 2018 at 06:03:32PM +0200, Peter Zijlstra wrote:
> On Mon, Mar 19, 2018 at 03:23:25PM +0800, changbin.du@...el.com wrote:
> > From: Changbin Du <changbin.du@...el.com>
> > 
> > Inspired by gdb command 'list', show the code context of target lines.
> > Here is a example:
> > 
> > $ scripts/faddr2line vmlinux native_write_msr+0x6
> > native_write_msr+0x6/0x20:
> > arch_static_branch at arch/x86/include/asm/msr.h:105
> > 100             return EAX_EDX_VAL(val, low, high);
> > 101     }
> > 102
> > 103     static inline void notrace __wrmsr(unsigned int msr, u32 low, u32 high)
> > 104     {
> > 105             asm volatile("1: wrmsr\n"
> > 106                          "2:\n"
> > 107                          _ASM_EXTABLE_HANDLE(1b, 2b, ex_handler_wrmsr_unsafe)
> > 108                          : : "c" (msr), "a"(low), "d" (high) : "memory");
> > 109     }
> > 110
> > (inlined by) static_key_false at include/linux/jump_label.h:142
> > 137     #define JUMP_TYPE_LINKED        2UL
> > 138     #define JUMP_TYPE_MASK          3UL
> > 139
> > 140     static __always_inline bool static_key_false(struct static_key *key)
> > 141     {
> > 142             return arch_static_branch(key, false);
> > 143     }
> > 144
> > 145     static __always_inline bool static_key_true(struct static_key *key)
> > 146     {
> > 147             return !arch_static_branch(key, true);
> > (inlined by) native_write_msr at arch/x86/include/asm/msr.h:150
> > 145     static inline void notrace
> > 146     native_write_msr(unsigned int msr, u32 low, u32 high)
> > 147     {
> > 148             __wrmsr(msr, low, high);
> > 149
> > 150             if (msr_tracepoint_active(__tracepoint_write_msr))
> > 151                     do_trace_write_msr(msr, ((u64)high << 32 | low), 0);
> > 152     }
> > 153
> > 154     /* Can be uninlined because referenced by paravirt */
> > 155     static inline int notrace
> 
> Not a fan of this :-/ And you didn't even make it optional. Nor did you
> Cc the original author of the tool.
Yeah, understand your compatibility concern, and thanks for your improvment.
I only added people from 'scripts/get_maintainer.pl'.


-- 
Thanks,
Changbin Du