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Re: [PATCH v4 3/3] ns16550: Gate all PCI code with CONFIG_X86
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Fri, 27 Nov 2020 14:16:07 +0000
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- Cc: Rahul Singh <Rahul.Singh@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 27 Nov 2020 14:16:36 +0000
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- Thread-topic: [PATCH v4 3/3] ns16550: Gate all PCI code with CONFIG_X86
Hi Jan,
> On 27 Nov 2020, at 13:58, Jan Beulich <jbeulich@xxxxxxxx> wrote:
>
> On 25.11.2020 19:16, Rahul Singh wrote:
>> --- a/xen/drivers/char/ns16550.c
>> +++ b/xen/drivers/char/ns16550.c
>> @@ -16,7 +16,7 @@
>> #include <xen/timer.h>
>> #include <xen/serial.h>
>> #include <xen/iocap.h>
>> -#ifdef CONFIG_HAS_PCI
>> +#if defined(CONFIG_X86) && defined(CONFIG_HAS_PCI)
>> #include <xen/pci.h>
>> #include <xen/pci_regs.h>
>> #include <xen/pci_ids.h>
>> @@ -51,7 +51,7 @@ static struct ns16550 {
>> unsigned int timeout_ms;
>> bool_t intr_works;
>> bool_t dw_usr_bsy;
>> -#ifdef CONFIG_HAS_PCI
>> +#if defined(CONFIG_X86) && defined(CONFIG_HAS_PCI)
>
> I'm sorry to be picky, but this being a hack wants, imo, also calling
> it so, by way of a code comment. Clearly this should go at one of the
> first instances, yet neither of the two above are really suitable imo.
> Hence I'm coming back to my prior suggestion of introducing a
> consolidated #define without this becoming a Kconfig setting:
>
> /*
> * The PCI part of the code in this file currently is only known to
> * work on x86. Undo this hack once the logic has been suitably
> * abstracted.
> */
> #if defined(CONFIG_HAS_PCI) && defined(CONFIG_X86)
> # define NS16550_PCI
> #endif
>
> And then use NS16550_PCI everywhere. I'd be fine making this
> adjustment while committing, if I knew that (a) you're okay with it
> and (b) the R-b and A-b you've already got can be kept.
>
Sounds ok to me so you can keep my R-b if you go this way.
Cheers
Bertrand
> Jan
>
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