linux-kernel - Re: 回复: [PATCH 2/2] uio:powerpc:mpc85xx: l2-cache-sram uio driver implementation

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Date:   Tue, 14 Jun 2022 07:18:48 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Wenhu Wang <wenhu.wang@...mail.com>,
        Greg KH <gregkh@...uxfoundation.org>
CC:     "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 回复: [PATCH 2/2] uio:powerpc:mpc85xx: l2-cache-sram uio driver implementation



Le 14/06/2022 à 08:09, Wenhu Wang a écrit :
>>> +static const struct vm_operations_struct uio_cache_sram_vm_ops = {
>>> +#ifdef CONFIG_HAVE_IOREMAP_PROT
>>
>> Same here.
>>
> 
> I tried to eliminate it in mainline
> See: [PATCH v2] mm: eliminate ifdef of HAVE_IOREMAP_PROT in .c files
> https://lkml.org/lkml/2022/6/10/695
> 

I looked at that patch.

I don't think you can just drop the #ifdef in function 
__access_remote_vm() in mm/memory.c

You have to replace it with something like:

	if (!IS_ENABLED(CONFIG_HAVE_IOREMAP_PROT))
		break;

Christophe