From: Florian Fainelli <f.fainelli@gmail.com>
To: Alexander A Sverdlin <alexander.sverdlin@nokia.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
Russell King <linux@armlinux.org.uk>,
linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: Re: [PATCH v7 2/2] ARM: ftrace: Add MODULE_PLTS support
Date: Wed, 27 Jan 2021 11:36:56 -0800 [thread overview]
Message-ID: <2855919e-2bc4-ff26-8f1b-c2a96aec9018@gmail.com> (raw)
In-Reply-To: <20210127110944.41813-3-alexander.sverdlin@nokia.com>
On 1/27/2021 3:09 AM, Alexander A Sverdlin wrote:
> From: Alexander Sverdlin <alexander.sverdlin@nokia.com>
>
> Teach ftrace_make_call() and ftrace_make_nop() about PLTs.
> Teach PLT code about FTRACE and all its callbacks.
> Otherwise the following might happen:
>
> ------------[ cut here ]------------
> WARNING: CPU: 14 PID: 2265 at .../arch/arm/kernel/insn.c:14 __arm_gen_branch+0x83/0x8c()
> ...
> Hardware name: LSI Axxia AXM55XX
> [<c0314a49>] (unwind_backtrace) from [<c03115e9>] (show_stack+0x11/0x14)
> [<c03115e9>] (show_stack) from [<c0519f51>] (dump_stack+0x81/0xa8)
> [<c0519f51>] (dump_stack) from [<c032185d>] (warn_slowpath_common+0x69/0x90)
> [<c032185d>] (warn_slowpath_common) from [<c03218f3>] (warn_slowpath_null+0x17/0x1c)
> [<c03218f3>] (warn_slowpath_null) from [<c03143cf>] (__arm_gen_branch+0x83/0x8c)
> [<c03143cf>] (__arm_gen_branch) from [<c0314337>] (ftrace_make_nop+0xf/0x24)
> [<c0314337>] (ftrace_make_nop) from [<c038ebcb>] (ftrace_process_locs+0x27b/0x3e8)
> [<c038ebcb>] (ftrace_process_locs) from [<c0378d79>] (load_module+0x11e9/0x1a44)
> [<c0378d79>] (load_module) from [<c037974d>] (SyS_finit_module+0x59/0x84)
> [<c037974d>] (SyS_finit_module) from [<c030e981>] (ret_fast_syscall+0x1/0x18)
> ---[ end trace e1b64ced7a89adcc ]---
> ------------[ cut here ]------------
> WARNING: CPU: 14 PID: 2265 at .../kernel/trace/ftrace.c:1979 ftrace_bug+0x1b1/0x234()
> ...
> Hardware name: LSI Axxia AXM55XX
> [<c0314a49>] (unwind_backtrace) from [<c03115e9>] (show_stack+0x11/0x14)
> [<c03115e9>] (show_stack) from [<c0519f51>] (dump_stack+0x81/0xa8)
> [<c0519f51>] (dump_stack) from [<c032185d>] (warn_slowpath_common+0x69/0x90)
> [<c032185d>] (warn_slowpath_common) from [<c03218f3>] (warn_slowpath_null+0x17/0x1c)
> [<c03218f3>] (warn_slowpath_null) from [<c038e87d>] (ftrace_bug+0x1b1/0x234)
> [<c038e87d>] (ftrace_bug) from [<c038ebd5>] (ftrace_process_locs+0x285/0x3e8)
> [<c038ebd5>] (ftrace_process_locs) from [<c0378d79>] (load_module+0x11e9/0x1a44)
> [<c0378d79>] (load_module) from [<c037974d>] (SyS_finit_module+0x59/0x84)
> [<c037974d>] (SyS_finit_module) from [<c030e981>] (ret_fast_syscall+0x1/0x18)
> ---[ end trace e1b64ced7a89adcd ]---
> ftrace failed to modify [<e9ef7006>] 0xe9ef7006
> actual: 02:f0:3b:fa
> ftrace record flags: 0
> (0) expected tramp: c0314265
>
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
--
Florian
next prev parent reply other threads:[~2021-01-27 19:47 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 [this message]
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
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