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From: Petr Mladek <pmladek@suse.com>
To: Balbir Singh <bsingharora@gmail.com>
Cc: AKASHI Takahiro <takahiro.akashi@linaro.org>,
	Jiri Kosina <jikos@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>, Torsten Duwe <duwe@lst.de>,
	live-patching@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v6 1/9] ppc64 (le): prepare for -mprofile-kernel
Date: Fri, 5 Feb 2016 11:22:24 +0100	[thread overview]
Message-ID: <20160205102222.GD3305@pathway.suse.cz> (raw)
In-Reply-To: <CAKTCnznB8WQGbuJkek7nhnXW6FSBR+Mk__jeNfpgfpTf8G9MMA@mail.gmail.com>

On Fri 2016-02-05 15:40:27, Balbir Singh wrote:
> On Thu, Feb 4, 2016 at 10:02 PM, Petr Mladek <pmladek@suse.com> wrote:
> For big endian builds I saw
> 
> Dump of assembler code for function alloc_pages_current:
>    0xc000000000256f00 <+0>:    mflr    r0
>    0xc000000000256f04 <+4>:    std     r0,16(r1)
>    0xc000000000256f08 <+8>:    bl      0xc000000000009e5c <.mcount>
>    0xc000000000256f0c <+12>:    mflr    r0
> 
> The offset is 8 bytes. Your earlier patch handled this by adding 16, I
> suspect it needs revisiting

It seems to be one of the funcitons that do not access any global
symbol. gcc does not produce TOC handling in this case when
compiled with -mprofile-kernel. I believe that it is a gcc bug.
More details can be found in the thread starting at
http://thread.gmane.org/gmane.linux.kernel/2134759/focus=2141996

Best Regards,
Petr

  reply	other threads:[~2016-02-05 10:22 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-25 15:38 [PATCH v6 0/9] ftrace with regs + live patching for ppc64 LE (ABI v2) Torsten Duwe
2016-01-25 15:26 ` [PATCH v6 1/9] ppc64 (le): prepare for -mprofile-kernel Torsten Duwe
2016-01-27 10:19   ` Michael Ellerman
2016-01-27 10:44     ` Torsten Duwe
2016-01-28  4:26       ` Michael Ellerman
2016-01-28  4:26         ` Michael Ellerman
2016-01-28 11:50         ` Torsten Duwe
2016-01-27 12:58     ` Alan Modra
2016-01-27 13:45       ` Torsten Duwe
2016-01-28  3:39       ` Michael Ellerman
2016-01-28  3:39         ` Michael Ellerman
2016-02-03  7:23   ` AKASHI Takahiro
2016-02-03  8:55     ` Jiri Kosina
2016-02-03 11:24       ` Torsten Duwe
2016-02-04  9:31         ` AKASHI Takahiro
2016-02-04 11:02           ` Petr Mladek
2016-02-05  4:40             ` Balbir Singh
2016-02-05 10:22               ` Petr Mladek [this message]
2016-02-04 21:47           ` Jiri Kosina
2016-01-25 15:27 ` [PATCH v6 2/9] ppc64le FTRACE_WITH_REGS implementation Torsten Duwe
2016-01-25 15:29 ` [PATCH v6 3/9] ppc use ftrace_modify_all_code default Torsten Duwe
2016-01-25 15:29 ` [PATCH v6 4/9] ppc64 ftrace_with_regs configuration variables Torsten Duwe
2016-01-25 15:30 ` [PATCH v6 5/9] ppc64 ftrace_with_regs: spare early boot and low level Torsten Duwe
2016-01-25 15:31 ` [PATCH v6 6/9] ppc64 ftrace: disable profiling for some functions Torsten Duwe
2016-01-25 15:31 ` [PATCH v6 7/9] ppc64 ftrace: disable profiling for some files Torsten Duwe
2016-01-25 15:33 ` [PATCH v6 8/9] Implement kernel live patching for ppc64le (ABIv2) Torsten Duwe
2016-01-26 10:50   ` Miroslav Benes
2016-01-26 12:48     ` Petr Mladek
2016-01-26 13:56       ` Torsten Duwe
2016-02-02 12:12       ` Petr Mladek
2016-02-02 15:45         ` Torsten Duwe
2016-02-02 16:47           ` Petr Mladek
2016-02-02 20:39             ` Jiri Kosina
2016-01-26 14:00     ` Torsten Duwe
2016-01-26 14:14       ` Miroslav Benes
2016-01-27  1:53         ` Jessica Yu
2016-02-02 13:46   ` [PATCH v6 8/9] " Denis Kirjanov
2016-02-10 18:03     ` Torsten Duwe
2016-01-25 15:33 ` [PATCH v6 9/9] Enable LIVEPATCH to be configured on ppc64le and add livepatch.o if it is selected Torsten Duwe
2016-01-27 10:51 ` [PATCH v6 0/9] ftrace with regs + live patching for ppc64 LE (ABI v2) Balbir Singh
2016-01-27 12:19   ` Torsten Duwe
2016-01-28  2:41     ` Balbir Singh
2016-01-28  3:31       ` Michael Ellerman
2016-01-28 11:19         ` Torsten Duwe

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