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From: Andy Lutomirski <luto@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	"H. J. Lu" <hjl.tools@gmail.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Jiri Slaby <jslaby@suse.cz>,
	Andrew Morton <akpm@linux-foundation.org>,
	live-patching@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	Jiri Kosina <jikos@kernel.org>
Subject: Re: [PATCH 7/7] DWARF: add the config option
Date: Sat, 20 May 2017 14:56:58 -0700	[thread overview]
Message-ID: <CALCETrVjpxYYBwFxWq+oQ9XCmnKsnw=xV0p7dxx-DJGvGCCPgA@mail.gmail.com> (raw)
In-Reply-To: <CA+55aFyB6nb7VZthWOdN9YgS0UHsWxzaersjfQw1s4uCH_Dv-g@mail.gmail.com>

On Sat, May 20, 2017 at 1:16 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> On Fri, May 19, 2017 at 10:23 PM, Andy Lutomirski <luto@kernel.org> wrote:
>>
>> I personally like the idea of using real DWARF annotations in the
>> entry code because it makes gdb work better (not kgdb -- real gdb
>> attached to KVM).  I bet that we could get entry asm annotations into
>> good shape if we really wanted to.  OTOH, getting DWARF to work well
>> for inline asm is really nasty IIRC.
>
> No. I will NAK *any* attempt to make our asm contain the crazy
> shit-for-brains annotations.
>
> Been there, done that, got the T-shirt, and then doused the T-shirt in
> gasoline and put it on fire.
>
> The amount of unreadable crap and bugs it requires is not worth the
> pain. Not for *any* amount of gain, and the gain here is basically
> zero.

But what if objtool autogenerated the annotations, perhaps with a tiny
bit of help telling it "hardware frame goes here" or "pt_regs goes
here"?

  reply	other threads:[~2017-05-20 21:57 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-05 12:21 [PATCH 1/7] DWARF: add option to preserve unwind info Jiri Slaby
2017-05-05 12:21 ` [PATCH 2/7] DWARF: EH-frame based stack unwinding Jiri Slaby
2017-05-05 12:21 ` [PATCH 3/7] vmlinux.lds: preserve eh_frame for DWARF unwinder Jiri Slaby
2017-05-05 12:21 ` [PATCH 4/7] DWARF: initialize structures for kernel and modules Jiri Slaby
2017-05-05 12:21 ` [PATCH 5/7] unwinder: show_stack, check also ret_addr_p's contents Jiri Slaby
2017-05-05 12:21 ` [PATCH 6/7] unwinder: plug in the DWARF unwinder Jiri Slaby
2017-05-05 12:22 ` [PATCH 7/7] DWARF: add the config option Jiri Slaby
2017-05-05 19:57   ` Linus Torvalds
2017-05-06  7:19     ` Ingo Molnar
2017-05-10  7:46       ` Jiri Slaby
2017-05-06 14:24     ` Jiri Kosina
2017-05-07 16:55     ` Josh Poimboeuf
2017-05-07 17:59       ` Ingo Molnar
2017-05-07 18:08         ` hpa
2017-05-07 21:48           ` Josh Poimboeuf
2017-05-08  7:50             ` Vojtech Pavlik
2017-05-08 13:14               ` Josh Poimboeuf
2017-05-08  5:35       ` Andy Lutomirski
2017-05-08  6:15         ` Ingo Molnar
2017-05-08 14:40         ` Josh Poimboeuf
2017-05-08 18:57           ` hpa
2017-05-09  0:21       ` Andy Lutomirski
2017-05-09  1:38         ` Josh Poimboeuf
2017-05-09  2:31           ` Andy Lutomirski
2017-05-09  3:38             ` Josh Poimboeuf
2017-05-09 10:00               ` hpa
2017-05-09 14:58                 ` Josh Poimboeuf
2017-05-09 16:46                   ` H.J. Lu
2017-05-10  8:15                 ` Jiri Slaby
2017-05-10 13:09                   ` Josh Poimboeuf
2017-05-10 16:23                     ` H.J. Lu
2017-05-09 18:47       ` Jiri Kosina
2017-05-09 19:22         ` Josh Poimboeuf
2017-05-10  8:32           ` Jiri Slaby
2017-05-10 13:13             ` Josh Poimboeuf
2017-05-23  7:07             ` Peter Zijlstra
2017-05-23  7:27               ` Ingo Molnar
2017-05-19 20:53       ` Josh Poimboeuf
2017-05-19 20:57         ` H. Peter Anvin
2017-05-19 20:59         ` H. Peter Anvin
2017-05-19 21:29           ` Josh Poimboeuf
2017-05-19 21:35             ` Josh Poimboeuf
2017-05-20  5:23               ` Andy Lutomirski
2017-05-20 16:20                 ` Josh Poimboeuf
2017-05-20 17:19                   ` Josh Poimboeuf
2017-05-20 20:01                   ` H.J. Lu
2017-05-20 21:58                     ` Andy Lutomirski
2017-05-20 22:20                       ` H.J. Lu
2017-05-22 11:34                         ` Jiri Kosina
2017-05-22 14:39                           ` H.J. Lu
2017-05-22 21:07                     ` H. Peter Anvin
2017-05-22 21:37                       ` H. Peter Anvin
2017-05-22 22:11                         ` Josh Poimboeuf
2017-05-20 20:16                 ` Linus Torvalds
2017-05-20 21:56                   ` Andy Lutomirski [this message]
2017-05-20 23:00                     ` Linus Torvalds
2017-05-20 23:29                       ` Linus Torvalds
2017-05-26  6:54               ` Jiri Slaby
2017-05-26 11:29                 ` Jiri Slaby
2017-05-26 12:14                   ` Josh Poimboeuf
2017-05-22 11:12             ` Ingo Molnar
2017-05-22 21:16               ` H. Peter Anvin
2017-05-22 23:23                 ` Jiri Kosina
2017-05-23  5:49                 ` Ingo Molnar
2017-05-26 19:16                   ` hpa
2017-05-28  9:12                     ` Ingo Molnar
2017-05-10  7:39     ` Jiri Slaby
2017-05-10 12:42       ` Josh Poimboeuf
2017-05-10 12:47         ` Jiri Slaby
2017-05-10 18:11       ` Linus Torvalds

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