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xen: events: simplify comment 

It is never valid assume any particular relationship between a Xen
PIRQ number and and Linux IRQ number so there is no need to hedge when
saying so.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
hifive-unleashed-5.1
Ian Campbell 2011-03-10 16:08:04 +00:00 committed by Konrad Rzeszutek Wilk
parent be49472f04
commit 653378acdd
2 changed files with 4 additions and 10 deletions
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10
drivers/xen/events.c
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@ -583,13 +583,9 @@ int xen_allocate_pirq(unsigned gsi, int shareable, char *name)
return xen_map_pirq_gsi(gsi, gsi, shareable, name);
}
/* xen_map_pirq_gsi might allocate irqs from the top down, as a
* consequence don't assume that the irq number returned has a low value
* or can be used as a pirq number unless you know otherwise.
*
* One notable exception is when xen_map_pirq_gsi is called passing an
* hardware gsi as argument, in that case the irq number returned
* matches the gsi number passed as second argument.
/*
* Do not make any assumptions regarding the relationship between the
* IRQ number returned here and the Xen pirq argument.
*
* Note: We don't assign an event channel until the irq actually started
* up. Return an existing irq if we've already got one for the gsi.

4
include/xen/events.h
View File

@ -68,9 +68,7 @@ int xen_set_callback_via(uint64_t via);
void xen_evtchn_do_upcall(struct pt_regs *regs);
void xen_hvm_evtchn_do_upcall(void);
/* Allocate an irq for a physical interrupt, given a gsi. "Legacy"
* GSIs are identity mapped; others are dynamically allocated as
* usual. */
/* Allocate an irq for a physical interrupt, given a gsi. */
int xen_allocate_pirq(unsigned gsi, int shareable, char *name);
int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name);