* evaluation order bug in acpi_pic_sci_set_trigger() ?
@ 2020-11-25 19:59 Alexey Dobriyan
2020-11-26 14:32 ` Rafael J. Wysocki
0 siblings, 1 reply; 3+ messages in thread
From: Alexey Dobriyan @ 2020-11-25 19:59 UTC (permalink / raw)
To: rjw, lenb; +Cc: linux-acpi
acpi_pic_sci_set_trigger() contains the following code:
/* Real old ELCR mask */
old = inb(0x4d0) | (inb(0x4d1) << 8);
Operand evalution order is not guaranteed for binary or.
I wonder if this is a bug?
Alexey
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: evaluation order bug in acpi_pic_sci_set_trigger() ?
2020-11-25 19:59 evaluation order bug in acpi_pic_sci_set_trigger() ? Alexey Dobriyan
@ 2020-11-26 14:32 ` Rafael J. Wysocki
2020-11-27 10:01 ` Alexey Dobriyan
0 siblings, 1 reply; 3+ messages in thread
From: Rafael J. Wysocki @ 2020-11-26 14:32 UTC (permalink / raw)
To: Alexey Dobriyan; +Cc: Rafael J. Wysocki, Len Brown, ACPI Devel Maling List
On Wed, Nov 25, 2020 at 8:59 PM Alexey Dobriyan <adobriyan@gmail.com> wrote:
>
> acpi_pic_sci_set_trigger() contains the following code:
>
> /* Real old ELCR mask */
> old = inb(0x4d0) | (inb(0x4d1) << 8);
>
> Operand evalution order is not guaranteed for binary or.
> I wonder if this is a bug?
Does the ordering matter in practice?
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: evaluation order bug in acpi_pic_sci_set_trigger() ?
2020-11-26 14:32 ` Rafael J. Wysocki
@ 2020-11-27 10:01 ` Alexey Dobriyan
0 siblings, 0 replies; 3+ messages in thread
From: Alexey Dobriyan @ 2020-11-27 10:01 UTC (permalink / raw)
To: Rafael J. Wysocki; +Cc: Rafael J. Wysocki, Len Brown, ACPI Devel Maling List
On Thu, Nov 26, 2020 at 03:32:37PM +0100, Rafael J. Wysocki wrote:
> On Wed, Nov 25, 2020 at 8:59 PM Alexey Dobriyan <adobriyan@gmail.com> wrote:
> >
> > acpi_pic_sci_set_trigger() contains the following code:
> >
> > /* Real old ELCR mask */
> > old = inb(0x4d0) | (inb(0x4d1) << 8);
> >
> > Operand evalution order is not guaranteed for binary or.
> > I wonder if this is a bug?
>
> Does the ordering matter in practice?
I have no idea, this is why I'm asking. :-)
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-11-25 19:59 evaluation order bug in acpi_pic_sci_set_trigger() ? Alexey Dobriyan
2020-11-26 14:32 ` Rafael J. Wysocki
2020-11-27 10:01 ` Alexey Dobriyan
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