[Xen-devel] [PATCH] linux/evtchn: allocate pirq_needs_eoi bitmap dynamically

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

Original patch from: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>

As usual, written and tested on 2.6.27.8 and made apply to the 2.6.18
tree without further testing.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- head-2008-12-08.orig/drivers/xen/core/evtchn.c      2008-12-05 
10:53:12.000000000 +0100
+++ head-2008-12-08/drivers/xen/core/evtchn.c   2008-12-10 10:47:20.000000000 
+0100
@@ -35,6 +35,7 @@
 #include <linux/interrupt.h>
 #include <linux/sched.h>
 #include <linux/kernel_stat.h>
+#include <linux/bootmem.h>
 #include <linux/version.h>
 #include <asm/atomic.h>
 #include <asm/system.h>
@@ -755,8 +756,7 @@ static struct irq_chip dynirq_chip = {
 
 /* Bitmap indicating which PIRQs require Xen to be notified on unmask. */
 static int pirq_eoi_does_unmask;
-static DECLARE_BITMAP(pirq_needs_eoi, ALIGN(NR_PIRQS, PAGE_SIZE * 8))
-       __attribute__ ((__section__(".bss.page_aligned"), 
__aligned__(PAGE_SIZE)));
+static unsigned long *pirq_needs_eoi;
 
 static void pirq_unmask_and_notify(unsigned int evtchn, unsigned int irq)
 {
@@ -1041,8 +1041,7 @@ void irq_resume(void)
        if (pirq_eoi_does_unmask) {
                struct physdev_pirq_eoi_gmfn eoi_gmfn;
 
-               eoi_gmfn.gmfn = arbitrary_virt_to_machine(pirq_needs_eoi)
-                       >> PAGE_SHIFT;
+               eoi_gmfn.gmfn = virt_to_machine(pirq_needs_eoi) >> PAGE_SHIFT;
                if (HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn, &eoi_gmfn))
                        BUG();
        }
@@ -1137,9 +1137,9 @@ void __init xen_init_IRQ(void)
 
        init_evtchn_cpu_bindings();
 
-       BUG_ON(!bitmap_empty(pirq_needs_eoi, PAGE_SIZE * 8));
-       eoi_gmfn.gmfn = arbitrary_virt_to_machine(pirq_needs_eoi)
-               >> PAGE_SHIFT;
+       pirq_needs_eoi = alloc_bootmem_pages(sizeof(unsigned long)
+               * BITS_TO_LONGS(ALIGN(NR_PIRQS, PAGE_SIZE * 8)));
+       eoi_gmfn.gmfn = virt_to_machine(pirq_needs_eoi) >> PAGE_SHIFT;
        if (HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn, &eoi_gmfn) == 0)
                pirq_eoi_does_unmask = 1;
 




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