linux-kernel - Re: __ubsan_handle_type_mismatch converted to __ubsan_handle_type_mismatch

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Date:   Fri, 6 Oct 2017 11:45:29 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Sodagudi Prasad <psodagud@...eaurora.org>,
        nicolas.iooss_linux@....org, akpm@...ux-foundation.org,
        mingo@...nel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: __ubsan_handle_type_mismatch converted to
 __ubsan_handle_type_mismatch_v1



On 10/06/2017 05:29 AM, Sodagudi Prasad wrote:
> Hi All,
> 
> Based on below links __ubsan_handle_type_mismatch has been renamed to  __ubsan_handle_type_mismatch_v1.
> 
> https://github.com/llvm-mirror/compiler-rt/commit/56faee71af1888ba12ab076b3d1f9bbe223493df#diff-21369cc6f3917b27df3ced8de89cf134
> https://www.mail-archive.com/gcc-bugs@gcc.gnu.org/msg535130.html
> 
> 
> When I tried to compile the kernel with LLVM seen following errors.
> arch/arm64/kernel/traps.o: In function `dump_backtrace':
> kernel/arch/arm64/kernel/traps.c:192: undefined reference to `__ubsan_handle_type_mismatch_v1'
> kernel/arch/arm64/kernel/traps.c:192: undefined reference to `__ubsan_handle_type_mismatch_v1'
> kernel/arch/arm64/kernel/traps.c:192: undefined reference to `__ubsan_handle_type_mismatch_v1'
> kernel/arch/arm64/kernel/traps.c:192: undefined reference to `__ubsan_handle_type_mismatch_v1'
> arch/arm64/kernel/traps.o: In function `dump_mem':
> 
> 
> Can I add __ubsan_handle_type_mismatch_v1 API similar to  __ubsan_handle_type_mismatch()(I will send path for review)?
> If both apis are present, then there will be backward compatibility.  Let me know if you have any other suggestions for this issue.

Sounds good, send the patch please.

> 
> -Thanks, Prasad
>