From: Alexander Sverdlin <alexander.sverdlin@nokia.com>
To: Linus Walleij <linus.walleij@linaro.org>,
Ard Biesheuvel <ardb@kernel.org>
Cc: Florian Fainelli <f.fainelli@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
Russell King <linux@armlinux.org.uk>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v7 0/2] ARM: Implement MODULE_PLT support in FTRACE
Date: Tue, 2 Mar 2021 11:00:51 +0100 [thread overview]
Message-ID: <950ee6f5-13f2-8a07-6956-6921df4fc435@nokia.com> (raw)
In-Reply-To: <CACRpkdZby96WZtO7FEHc1YJ0RfyCi2u_q1PsfJQP6yLGX1Nmrg@mail.gmail.com>
Hello Linus,
On 02/03/2021 09:29, Linus Walleij wrote:
>>>> FTRACE's function tracer currently doesn't always work on ARM with
>>>> MODULE_PLT option enabled. If the module is loaded too far, FTRACE's
First of all:
config ARM_MODULE_PLTS
bool "Use PLTs to allow module memory to spill over into vmalloc area"
[...]
> Any suggestions on a quick use case that illustrates how the problem
> manifest and how to test it is gone? The errors in patch 2, what do
> I need to configure in to get them? Does it manifest at modprobe?
And then I use this module to test for the problem:
/**********************************************************************
* Author: Alexander Sverdlin <alexander.sverdlin@nokia.com>
*
* Copyright (c) 2018 Nokia
*
* SPDX-License-Identifier: GPL-2.0
*
* This module is intended to test ARM MODULE_PLT functionality
**********************************************************************/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/module.h>
static int fatmod_init(void)
{
asm volatile (".rept (6 * 1024 * 1024 / 2)\n\t"
"nop\n\t"
".endr");
return 0;
}
module_init(fatmod_init);
static void __exit fatmod_exit(void)
{
}
module_exit(fatmod_exit);
MODULE_AUTHOR("Alexander Sverdlin <alexander.sverdlin@nokia.com>");
MODULE_DESCRIPTION("ARM MODULE_PLT test module");
MODULE_LICENSE("GPL");
--
Best regards,
Alexander Sverdlin.
prev parent reply other threads:[~2021-03-02 10:47 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-27 11:09 [PATCH v7 0/2] ARM: Implement MODULE_PLT support in FTRACE Alexander A Sverdlin
2021-01-27 11:09 ` [PATCH v7 1/2] ARM: PLT: Move struct plt_entries definition to header Alexander A Sverdlin
2021-01-27 20:25 ` Florian Fainelli
2021-01-27 11:09 ` [PATCH v7 2/2] ARM: ftrace: Add MODULE_PLTS support Alexander A Sverdlin
2021-01-27 19:36 ` Florian Fainelli
2021-03-07 17:26 ` Qais Yousef
2021-03-08 7:58 ` Alexander Sverdlin
2021-03-09 17:42 ` Qais Yousef
2021-03-10 7:23 ` Alexander Sverdlin
2021-03-10 16:14 ` Florian Fainelli
2021-03-10 17:17 ` Alexander Sverdlin
2021-03-12 17:24 ` Qais Yousef
2021-03-12 18:35 ` Florian Fainelli
2021-03-14 22:02 ` Qais Yousef
2021-03-21 19:06 ` Qais Yousef
2021-03-22 15:01 ` Steven Rostedt
2021-03-22 16:32 ` Qais Yousef
2021-03-22 17:02 ` Alexander Sverdlin
2021-03-23 22:22 ` Qais Yousef
2021-03-24 3:37 ` Florian Fainelli
2021-03-24 16:10 ` Qais Yousef
2021-03-24 9:04 ` Alexander Sverdlin
2021-03-24 15:57 ` Qais Yousef
2021-03-24 16:33 ` Alexander Sverdlin
2021-03-24 16:46 ` Qais Yousef
2021-03-15 9:19 ` Alexander Sverdlin
2021-02-03 18:23 ` [PATCH v7 0/2] ARM: Implement MODULE_PLT support in FTRACE Florian Fainelli
2021-02-15 18:31 ` Ard Biesheuvel
2021-03-02 8:29 ` Linus Walleij
2021-03-02 10:00 ` Alexander Sverdlin [this message]
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