Re: [PATCH 2/2] Docs/mm: fix THP policy counts in transhuge

[Song Hu <husong@kylinos.cn>]

在 2026/8/12 18:52, Baolin Wang 写道:
> 
> 
> On 8/12/26 5:27 PM, Lorenzo Stoakes (ARM) wrote:
>> On Wed, Aug 12, 2026 at 04:03:13PM +0800, Song Hu wrote:
>>> transhuge.rst claims seven policies for transparent_hugepage_shmem= and
>>> four for transparent_hugepage_tmpfs=.  Both boot parameters are parsed by
>>> shmem_parse_huge(), which accepts six: always, within_size, advise, never,
>>> deny and force.  The "four" applies only to the per-mount huge= option
>>> (shmem_param_enums_huge).  Fix both counts to six.
>>>
>>> Signed-off-by: Song Hu <husong@kylinos.cn>
>>> ---
>>>   Documentation/admin-guide/mm/transhuge.rst | 6 +++---
>>>   1 file changed, 3 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst
>>> index b187d618452f..72e944f49da5 100644
>>> --- a/Documentation/admin-guide/mm/transhuge.rst
>>> +++ b/Documentation/admin-guide/mm/transhuge.rst
>>> @@ -389,14 +389,14 @@ is not defined within a valid ``thp_anon``, its policy will default to
>>>   Similarly to ``transparent_hugepage``, you can control the hugepage
>>>   allocation policy for the internal shmem mount by using the kernel parameter
>>>   ``transparent_hugepage_shmem=<policy>``, where ``<policy>`` is one of the
>>> -seven valid policies for shmem (``always``, ``within_size``, ``advise``,
>>> +six valid policies for shmem (``always``, ``within_size``, ``advise``,
>>>   ``never``, ``deny``, and ``force``).
>>
>> I'm not sure we really want to advertise 'special' testing modes like this,
>> sorry. These are not modes anybody should be using in practice especially at
>> kernel boot. We should probably stop people doing that...!
> 
> Yes, 'deny' and 'force' are testing-only configurations and really shouldn't be exposed via the kernel command line. I'll clean them up.
Hi, Baolin, Lorenzo

Thanks for the reviews.

OK, dropping 1/2.

2/2 is wrong too, the tmpfs count was correct as written, and the shmem
part is better sorted out by Baolin's cleanup of the deny/force boot
param exposure.  Withdrawing the whole series.

Thanks,
Song