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Sun, 07 Mar 2021 09:36:20 +0800 (CST) Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Mailer: BlackBerry Email (10.3.3.3216) Message-ID: <20210307013618.5783639.28921.9491@loongson.cn> Date: Sun, 07 Mar 2021 09:36:18 +0800 Subject: Re: [PATCH 1/3] MIPS: sync arrangement of pt_regs with user_pt_regs and regoffset_table From: =?utf-8?b?6buE5rKb?= In-Reply-To: <20210306074711.GA4744@alpha.franken.de> References: <20210305100310.26627-1-huangpei@loongson.cn> <20210305100310.26627-2-huangpei@loongson.cn> <20210306074711.GA4744@alpha.franken.de> To: Thomas Bogendoerfer Cc: ambrosehua@gmail.com, Bibo Mao , Andrew Morton , linux-mips@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, Jiaxun Yang , Paul Burton , Li Xuefeng , Yang Tiezhu , Gao Juxin , Huacai Chen , Jinyang He X-CM-TRANSID:AQAAf9Dxr9cQLkRgpMcVAA--.6957S2 X-Coremail-Antispam: 1UD129KBjvJXoW7Aw1DZr1fWrWDurWUXr18Zrb_yoW8uFy5pF srCa1DKF4Ig348K3y7urZ5uryUJr1DG392gFZrt340qa4Yv3WfWrWSyw1DJr48ArWvqa48 Cayavwn8CrZFva7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvK14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r1j6r1xM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Cr0_Gr1UM28EF7xvwVC2z280aVCY1x0267AKxVW8JV W8Jr1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_JrI_JrylYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2 Y2ka0xkIwI1lc2xSY4AK67AK6w4l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr 0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY 17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcV C0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWrZr1j6s0DMIIF 0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxh VjvjDU0xZFpf9x0JUChFxUUUUU= X-CM-SenderInfo: xkxd0whshlqz5rrqw2lrqou0/ X-Stat-Signature: io6xdypk81yi63m4n7s94bpa66rr4n9n X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 54666C0001F7 Received-SPF: none (loongson.cn>: No applicable sender policy available) receiver=imf14; identity=mailfrom; envelope-from=""; helo=loongson.cn; client-ip=114.242.206.163 X-HE-DKIM-Result: none/none X-HE-Tag: 1615080987-212114 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000063, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: What about other two patches?=C2=A0 Current ftrace implementation is not safe on MIPS/SMP, When disabling =C2=A0tracing, we need to change=C2=A0 Jal=C2=A0 Addiu sp,sp,-offset Into=C2=A0 Nop Nop Atomically, but mips issue two writes, no=C2=A0 matter =E2=80=8E in what order these writes are seen by other cpu, =E2=80=8E it is wrecked in =C2=A0these two case Jal=C2=A0 Nop Or, Nop =E2=80=8Eaddiu sp,sp, _offset =E2=80=8EHuang Pei =C2=A0 Original Message =C2=A0 From: Thomas Bogendoerfer Sent: 2021=E5=B9=B43=E6=9C=886=E6=97=A5=E6=98=9F=E6=9C=9F=E5=85=AD 16:06 To: Huang Pei Cc: ambrosehua@gmail.com; Bibo Mao; Andrew Morton; linux-mips@vger.kernel.o= rg; linux-arch@vger.kernel.org; linux-mm@kvack.org; Jiaxun Yang; Paul Burto= n; Li Xuefeng; Yang Tiezhu; Gao Juxin; Huacai Chen; Jinyang He Subject: Re: [PATCH 1/3] MIPS: sync arrangement of pt_regs with user_pt_reg= s and regoffset_table On Fri, Mar 05, 2021 at 06:03:08PM +0800, Huang Pei wrote: > Signed-off-by: Huang Pei > --- > arch/mips/include/asm/ptrace.h | 10 +++++----- > arch/mips/kernel/asm-offsets.c | 6 +++--- > arch/mips/kernel/ptrace.c | 10 +++++----- > 3 files changed, 13 insertions(+), 13 deletions(-) >=20 > diff --git a/arch/mips/include/asm/ptrace.h b/arch/mips/include/asm/ptrac= e.h > index 1e76774b36dd..e51691f2b7af 100644 > --- a/arch/mips/include/asm/ptrace.h > +++ b/arch/mips/include/asm/ptrace.h > @@ -34,16 +34,16 @@ struct pt_regs { > /* Saved main processor registers. */ > unsigned long regs[32]; >=20 > + unsigned long lo; > + unsigned long hi; > /* Saved special registers. */ > + unsigned long cp0_epc; > + unsigned long cp0_badvaddr; > unsigned long cp0_status; > - unsigned long hi; > - unsigned long lo; > + unsigned long cp0_cause; > #ifdef CONFIG_CPU_HAS_SMARTMIPS > unsigned long acx; > #endif > - unsigned long cp0_badvaddr; > - unsigned long cp0_cause; > - unsigned long cp0_epc; > #ifdef CONFIG_CPU_CAVIUM_OCTEON > unsigned long long mpl[6]; /* MTM{0-5} */ > unsigned long long mtp[6]; /* MTP{0-5} */ sorry this is pointless, I'm not taking this. Thomas. --=20 Crap can work. Given enough thrust pigs will fly, but it's not necessarily a good idea. [ RFC1925, 2.3 ]