[llvmlinux] "make test" for x86_64 target just hung there, why?

Sedat Dilek sedat.dilek at gmail.com
Sat Sep 12 20:09:26 UTC 2015

On Sat, Sep 12, 2015 at 6:50 PM, Daniel Sanders
<Daniel.Sanders at imgtec.com> wrote:
> That patch looks right to me. Given that it didn't cause GCC to show the bug too, the problem is unlikely to be the same kind of bug I had with the slab allocator.

Thanks for all the feedback.

I have seen that the issue occurs with -O2 (two) and -O3 (three).
Whereas -O0 (zero) and -O1 (one) and -Oz

I rebuild a last Linux-kernel with CONFIG_CC_OPTIMIZE_FOR_SIZE=y.

- Sedat -

> ________________________________________
> From: Sedat Dilek [sedat.dilek at gmail.com]
> Sent: 12 September 2015 15:36
> To: Daniel Sanders
> Cc: pageexec at gmail.com; llvmlinux at lists.linuxfoundation.org; David Woodhouse
> Subject: Re: [llvmlinux] "make test" for x86_64 target just hung there, why?
> I tried with the attached patch on top of Linux v4.2 + llvmlinux
> patchset, but this seems not to disable "inline optimization".
> Re-compiling lib/bitmap with gcc v4.9 let's my kernel boot.
> Maybe pipacs is right when he says it might be a
> For AMD64 and GCC...
> CONFIG_ARCH_HWEIGHT_CFLAGS="-fcall-saved-rdi -fcall-saved-rsi
> -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9
> -fcall-saved-r10 -fcall-saved-r11"
> FYI: This is not used with LLVMLinux.
> Empty head,
> - Sedat -

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