linux-kernel - Re: [External] Re: [PATCH v4] riscv: add userland instruction dump to RISC-V splats

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Message-ID: <87msy6p8k3.fsf@all.your.base.are.belong.to.us>
Date:   Fri, 01 Sep 2023 11:05:48 +0200
From:   Björn Töpel <bjorn@...nel.org>
To:     yunhui cui <cuiyunhui@...edance.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, guoren@...nel.org, bjorn@...osinc.com,
        conor.dooley@...rochip.com, jszhang@...nel.org,
        andy.chiu@...ive.com, dave.hansen@...ux.intel.com,
        elver@...gle.com, glider@...gle.com, cyphar@...har.com,
        kirill.shutemov@...ux.intel.com, keescook@...omium.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [External] Re: [PATCH v4] riscv: add userland instruction dump
 to RISC-V splats

yunhui cui <cuiyunhui@...edance.com> writes:

> Hi Björn，
>
> On Fri, Aug 18, 2023 at 9:33 PM Björn Töpel <bjorn@...nel.org> wrote:
>>
>> Yunhui Cui <cuiyunhui@...edance.com> writes:
>>
>> > Add userland instruction dump and rename dump_kernel_instr()
>> > to dump_instr().
>> >
>> > An example:
>> > [    0.822439] Freeing unused kernel image (initmem) memory: 6916K
>> > [    0.823817] Run /init as init process
>> > [    0.839411] init[1]: unhandled signal 4 code 0x1 at 0x000000000005be18 in bb[10000+5fb000]
>> > [    0.840751] CPU: 0 PID: 1 Comm: init Not tainted 5.14.0-rc4-00049-gbd644290aa72-dirty #187
>> > [    0.841373] Hardware name:  , BIOS
>> > [    0.841743] epc : 000000000005be18 ra : 0000000000079e74 sp : 0000003fffcafda0
>> > [    0.842271]  gp : ffffffff816e9dc8 tp : 0000000000000000 t0 : 0000000000000000
>> > [    0.842947]  t1 : 0000003fffc9fdf0 t2 : 0000000000000000 s0 : 0000000000000000
>> > [    0.843434]  s1 : 0000000000000000 a0 : 0000003fffca0190 a1 : 0000003fffcafe18
>> > [    0.843891]  a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
>> > [    0.844357]  a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000000000000
>> > [    0.844803]  s2 : 0000000000000000 s3 : 0000000000000000 s4 : 0000000000000000
>> > [    0.845253]  s5 : 0000000000000000 s6 : 0000000000000000 s7 : 0000000000000000
>> > [    0.845722]  s8 : 0000000000000000 s9 : 0000000000000000 s10: 0000000000000000
>> > [    0.846180]  s11: 0000000000d144e0 t3 : 0000000000000000 t4 : 0000000000000000
>> > [    0.846616]  t5 : 0000000000000000 t6 : 0000000000000000
>> > [    0.847204] status: 0000000200000020 badaddr: 00000000f0028053 cause: 0000000000000002
>> > [    0.848219] Code: f06f ff5f 3823 fa11 0113 fb01 2e23 0201 0293 0000 (8053) f002
>> > [    0.851016] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004
>> >
>> > Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
>>
>> Nice!
>>
>> Reviewed-by: Björn Töpel <bjorn@...osinc.com>
>
> When can this patch be applied to the linux-next branch?

It looks like you're getting a sparse warning on the patch [1], and
that's probably why it hasn't been considered. You need something like:

--
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 69b5d18b5ae9..c5364131b8bd 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -34,7 +34,7 @@ int show_unhandled_signals = 1;
 static DEFINE_SPINLOCK(die_lock);
 
 #define get_user_nofault(val, ptr) ({                          \
-       const typeof(val) *__gk_ptr = (ptr);                    \
+       const typeof(val) __user *__gk_ptr = (__force const typeof(val) __user *)(ptr); \
        copy_from_user_nofault(&(val), __gk_ptr, sizeof(val));\
 })
--

IDK, maybe it worth removing the define all together, and just open code
it.

When you're submitting patches, it's a good thing to track patchwork for
warnings/errors.


Björn

[1] https://patchwork.kernel.org/project/linux-riscv/patch/20230818121504.60492-1-cuiyunhui@bytedance.com/