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[80.56.140.230]) by smtp.gmail.com with ESMTPSA id k7-20020aa7c047000000b004132d3b60aasm7929467edo.78.2022.03.08.09.29.09 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 08 Mar 2022 09:29:09 -0800 (PST) From: Arend Van Spriel To: Alexander Sverdlin , Steven Rostedt CC: Ingo Molnar , Linux Kernel Mailing List , Russell King , Abel Vesa , Rabin Vincent , Colin Cross Date: Tue, 08 Mar 2022 18:29:08 +0100 Message-ID: <17f6a93d6a0.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com> In-Reply-To: <1dec8992-b924-7ea2-8e45-a6bbc10a6086@nokia.com> References: <9a86b2c9-1009-1683-442e-61c5a7dc8cf3@broadcom.com> <20220307082450.641ed866@gandalf.local.home> <62c01368-b67f-66af-2e31-d62f4df75b61@broadcom.com> <20220308102007.6c6618e7@gandalf.local.home> <1dec8992-b924-7ea2-8e45-a6bbc10a6086@nokia.com> User-Agent: AquaMail/1.34.0 (build: 103400118) Subject: Re: ftrace bug MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000b0d7b605d9b85100" X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RDNS_NONE,SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --000000000000b0d7b605d9b85100 Content-Type: text/plain; format=flowed; charset="us-ascii" Content-Transfer-Encoding: 8bit On March 8, 2022 5:03:00 PM Alexander Sverdlin wrote: > Hi Arend! > > On 08/03/2022 16:20, Steven Rostedt wrote: >>>> I wanted to use FTRACE on an ARM platform and I hit the following >>>> warning which results in ftrace bug. This happens upon loading a module. >>>> Looking up the warning I suspect the branch target is too far off. The >>>> module is quite large and therefor not loaded in the modules section. Is >>>> there a way to exclude a module. In ftrace_module_init I see a check for >>>> !mod->num_ftrace_callsites. Is there a way to avoid creating ftrace >>>> callsites in a module? >>> Are you sure it's the size. Just want to make sure that's the reason before >>> going with different solutions. >> Interpreting the warning statement in insn.c and given the fact that the >> module is loaded at 0xe3xxxxxx instead of kernel module space at >> 0xbfxxxxxx I made this assumption, but .... >> >>>> Regards, >>>> Arend >>>> >>>> ------------[ cut here ]------------ >>>> >>>> WARNING: CPU: 2 PID: 1525 at arch/arm/kernel/insn.c:47 >>>> __arm_gen_branch+0x70/0x78 >>>> >>>> CPU: 2 PID: 1525 Comm: insmod Tainted: P 4.19.183 #2 > > This problem is addressed by: Cool. Thanks for the info. > commit 8113e622926ef6590771ede0f7f64821e1751b67 > Author: Alex Sverdlin > Date: Mon Sep 27 14:02:45 2021 -0700 > > ARM: 9079/1: ftrace: Add MODULE_PLTS support > > commit 79f32b221b18c15a98507b101ef4beb52444cc6f upstream > > 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 > [] (unwind_backtrace) from [] (show_stack+0x11/0x14) > [] (show_stack) from [] (dump_stack+0x81/0xa8) > [] (dump_stack) from [] (warn_slowpath_common+0x69/0x90) > [] (warn_slowpath_common) from [] > (warn_slowpath_null+0x17/0x1c) > [] (warn_slowpath_null) from [] > (__arm_gen_branch+0x83/0x8c) > [] (__arm_gen_branch) from [] (ftrace_make_nop+0xf/0x24) > [] (ftrace_make_nop) from [] > (ftrace_process_locs+0x27b/0x3e8) > [] (ftrace_process_locs) from [] > (load_module+0x11e9/0x1a44) > [] (load_module) from [] (SyS_finit_module+0x59/0x84) > [] (SyS_finit_module) from [] (ret_fast_syscall+0x1/0x18) > ---[ end trace e1b64ced7a89adcc ]--- > ------------[ cut here ]------------ > > And if you wanna stick with 4.19.y, it's included starting from v4.19.209. Will see if our router kernel team wants to move. At least I can try my own experiment with this. 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