Re: [PATCH v11] lib: checksum: Use aligned accesses for ip_fast_csum and csum_ipv6_magic tests

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Le 01/03/2024 à 19:32, Guenter Roeck a écrit :
> This leaves the mps2-an385:mps2_defconfig crash, which is avoided by 
> this patch.
> My understanding, which may be wrong, is that arm images with thumb 
> instructions
> do not support unaligned accesses (maybe I should say do not support 
> unaligned
> accesses with the mps2-an385 qemu emulation; I did not test with real 
> hardware,
> after all).
> Given all that, the continued discussion around the subject, and the lack
> of agreement if unaligned accesses should be tested or not, I don't really
> see a path forward for this patch. The remaining known problem is arm with
> thumb instructions. I don't think that is going to be fixed. I suspect that
> no one but me even tries to run that code (or any arm:nommu images, for 
> that
> matter). I'd suggest to drop this patch, and I'll stop testing IP checksum
> generation for mps2-an385:mps2_defconfig.

I'm trying to run an ARM kernel built with GCC 13.2 and mps2_defconfig 
on the mps2-an385 qemu emulation, and I get the following fatal error.

$ qemu-system-arm -M mps2-an385 -kernel vmlinux
qemu: fatal: Lockup: can't escalate 3 to HardFault (current priority -1)

R00=00000000 R01=00000000 R02=00000000 R03=00000000
R04=00000000 R05=00000000 R06=00000000 R07=00000000
R08=00000000 R09=00000000 R10=00000000 R11=00000000
R12=00000000 R13=ffffffe0 R14=fffffff9 R15=00000000
XPSR=40000003 -Z-- A handler
FPSCR: 00000000
Abandon (core dumped)

Can you tell how to proceed ?


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