Re: [PATCH] lib/vsprintf: Make no_hash_pointers take effect early

[Kaitao Cheng]

在 2026/6/10 22:59, Andy Shevchenko 写道:
> On Wed, Jun 10, 2026 at 08:45:25PM +0800, Kaitao Cheng wrote:
> 
>> The no_hash_pointers boot parameter is now handled as an alias for
>> hash_pointers=never. However, hash_pointers=never only records the
>> selected mode during early parameter parsing, and no_hash_pointers is
>> not updated until hash_pointers_finalize() runs later from SLUB init.
>>
>> This leaves a window during very early boot where %p output is still
>> hashed even though the user explicitly requested unhashed pointers with
>> no_hash_pointers or hash_pointers=never.
>>
>> Set no_hash_pointers as soon as the "never" mode is parsed. The later
>> hash_pointers_finalize() call still keeps the final policy decision in
>> one place, but explicit requests to disable pointer hashing now take
>> effect for early boot users too.
> 
> How is it documented now? And if not documented at all, needs to be.

In Documentation/admin-guide/kernel-parameters.txt, the descriptions of
both no_hash_pointers and hash_pointers= are already marked as [KNL,EARLY],
which should match the current semantics.

-- 
Thanks
Kaitao Cheng