ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux
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<ajb-linaro> are there any helpers to go from pte_t to pgprot_t that don't involve manually masking pte_val(pte_t)?
* ajb-linaro is fixing an errata on rebasing to 6.9 and it seems there were some changes for CONFIG_ARM64_PA_BITS_52
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<ajb-linaro> - pgprot_t prot = __pgprot(pte_val(pte) & ~PTE_ADDR_MASK);
<ajb-linaro> + pgprot_t prot = __pgprot(pte_val(pte) & ~PTE_ADDR_LOW);
<ajb-linaro> I guess that will work for now
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<ardb> ajb-linaro: LPA2 repurposes shareability bits as physical address bits
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<ardb> so it depends on the context, but in general, you need to decide whether or not LPA2 is enabled if you want to isolate non-address bits
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<ajb-linaro> ardb thats why I was wondering if this would be wrapped up in a helper - I guess for LPA2 you need to go somewhere else to find the protection bits? another level of the table?
<ardb> ajb-linaro: in TCR_ELx iirc
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<ukleinek> ardb: On an i.MX25 (armv5te) I experience:
<ukleinek> root 00:07 : ~ # echo function_graph > /sys/kernel/tracing/current_tracer
<ukleinek> [ 497.522862] Kernel panic - not syncing: �
<ukleinek> [ 497.527111] ---[ end Kernel panic - not syncing: � ]---
<ukleinek> bisect points on 953f534a7ed6b725d4f101d2949393acc9262880
<ukleinek> it reproduces reliably up to 6.9
<ukleinek> (Isn't anyone using armv5 any more?)
<arnd> ukleinek: are you sure the problem is ARMv5? I wonder if it's just CONFIG_UNWINDER_FRAME_POINTER that is broken for everyone. Which unwinder does your build use?
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<ukleinek> arnd: armv5 is just what I guessed could be the problem, because the newer variant of the machine with an armv7 works fine.
<ukleinek> arnd: but indeed, the armv5 uses CONFIG_UNWINDER_FRAME_POINTER=y while armv7 doesn't. I agree that looks like a more likely candidate
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