linux-kernel - [PATCH 03/14] xen: events: simplify comment

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Message-Id: <1299692486-28634-3-git-send-email-ian.campbell@citrix.com>
Date:	Wed,  9 Mar 2011 17:41:15 +0000
From:	Ian Campbell <ian.campbell@...rix.com>
To:	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Ian Campbell <ian.campbell@...rix.com>
Subject: [PATCH 03/14] 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@...rix.com>
---
 drivers/xen/events.c |   10 +++-------
 include/xen/events.h |    4 +---
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 2ce95a6..a9c154d 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -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.
diff --git a/include/xen/events.h b/include/xen/events.h
index 962da2c..f6fed94 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -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);
 
-- 
1.5.6.5

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