linux-kernel - Re: [PATCH v2] m68k: Define NR

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Message-ID: <65959acc-c59b-4aca-8ab4-5d0603d22110@redhat.com>
Date: Tue, 24 Sep 2024 16:09:39 +0200
From: David Hildenbrand <david@...hat.com>
To: Guenter Roeck <linux@...ck-us.net>,
 Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org,
 Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2] m68k: Define NR_CPUS

On 24.09.24 16:04, Guenter Roeck wrote:
> On 9/24/24 00:48, Geert Uytterhoeven wrote:
>> Hi David,
>>
>> On Tue, Sep 24, 2024 at 9:34 AM David Hildenbrand <david@...hat.com> wrote:
>>> On 24.09.24 01:56, Guenter Roeck wrote:
>>>> v2: Instead of trying to make SPLIT_PTE_PTLOCKS depend on the
>>>>        existence of NR_CPUS, define NR_CPUS for m68k.
>>>
>>> Okay, looks like we're cleaning up CONFIG_NR_CPUS for good.
>>>
>>> I'm back from conference travel tomorrow; I'll then throw in the following
>>> into cross compilers and fixup any other arch that needs attention:
>>>
>>>
>>> diff --git a/include/linux/threads.h b/include/linux/threads.h
>>> index 1674a471b0b4..e31715e6746b 100644
>>> --- a/include/linux/threads.h
>>> +++ b/include/linux/threads.h
>>> @@ -13,8 +13,7 @@
>>>      * bit of memory.  Use nr_cpu_ids instead of this except for static bitmaps.
>>>      */
>>>     #ifndef CONFIG_NR_CPUS
>>> -/* FIXME: This should be fixed in the arch's Kconfig */
>>> -#define CONFIG_NR_CPUS 1
>>> +#error "CONFIG_NR_CPUS not defined"
>>>     #endif
>>>
>>>     /* Places which use this should consider cpumask_var_t. */
>>
>> This is gonna trigger on almost all architectures if CONFIG_SMP=n.
>>
> 
> Guess that means that my patch won't work either. Any better ideas ?

As discussed,

diff --git a/mm/Kconfig b/mm/Kconfig
index 09aebca1cae3..4c9f5ea13271 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -595,6 +595,7 @@ config ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
  config SPLIT_PTE_PTLOCKS
         def_bool y
         depends on MMU
+       depends on SMP
         depends on NR_CPUS >= 4
         depends on !ARM || CPU_CACHE_VIPT
         depends on !PARISC || PA20


Might work for the time being.


-- 
Cheers,

David / dhildenb