linux-kernel - Re: [linux-next:master] [x86/module] 6661cae1aa: WARNING:at_arch/x86/mm/pat/set_memory.c:#__cpa_process

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Message-ID: <ca0f4984-ab89-42b4-a42d-a2d155e848e1@intel.com>
Date: Mon, 14 Oct 2024 09:08:30 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Mike Rapoport <rppt@...nel.org>
Cc: kernel test robot <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev,
 lkp@...el.com, Linux Memory Management List <linux-mm@...ck.org>,
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Subject: Re: [linux-next:master] [x86/module] 6661cae1aa:
 WARNING:at_arch/x86/mm/pat/set_memory.c:#__cpa_process_fault

On 10/14/24 08:44, Mike Rapoport wrote:
>> To me, it seems like execmem itself should be excluding all HIGHMEM=y
>> builds or _maybe_ all 32-bit builds because execmem has the built-in
>> assumption that vmalloc memory is in the direct map.
> I presume you mean execmem cache here, as execmem in general should work
> everywhere.

Yeah, just the new execmem cache code from the new series.

> After discussion with Christoph about how to define
> execmem_fill_trapping_insns(), I'm going to add a Kconfig opt-in option
> that will guard the entire execmem cache implementation and have it
> selected by x86_64.

Seems fine to me, as long as we're clear in the changelog why it's there.