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Re: [PATCH 4/7] xen/events: remove some simple helpers from events_base.c
- To: Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Tue, 14 Nov 2023 09:28:46 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 14 Nov 2023 08:29:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.11.23 18:35, Oleksandr Tyshchenko wrote:
On 16.10.23 09:28, Juergen Gross wrote:
Hello Juergen.
The helper functions type_from_irq() and cpu_from_irq() are just one
line functions used only internally.
Open code them where needed. At the same time modify and rename
get_evtchn_to_irq() to return a struct irq_info instead of the IRQ
number.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
[snip]
@@ -1181,15 +1172,16 @@ static int bind_evtchn_to_irq_chip(evtchn_port_t
evtchn, struct irq_chip *chip,
{
int irq;
int ret;
+ struct irq_info *info;
if (evtchn >= xen_evtchn_max_channels())
return -ENOMEM;
I assume this check is called here (*before* holding a lock) by
intention, as evtchn_to_info() below contains the same check.
Yes.
mutex_lock(&irq_mapping_update_lock);
- irq = get_evtchn_to_irq(evtchn);
+ info = evtchn_to_info(evtchn) >
- if (irq == -1) {
+ if (!info) {
irq = xen_allocate_irq_dynamic();
if (irq < 0)
goto out;
@@ -1212,8 +1204,8 @@ static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn,
struct irq_chip *chip,
*/
bind_evtchn_to_cpu(evtchn, 0, false);
} else {
- struct irq_info *info = info_for_irq(irq);
- WARN_ON(info == NULL || info->type != IRQT_EVTCHN);
+ WARN_ON(info->type != IRQT_EVTCHN);
+ irq = info->irq;
}
This hunk doesn't apply clearly to the latest state, because of
"9e90e58c11b7 xen: evtchn: Allow shared registration of IRQ handers"
went in. Please rebase.
With that:
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
Thanks,
Juergen
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