path: root/arch/arm/include
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authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-24 16:06:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-24 16:18:31 -0800
commit77be36de8b07027a70fbc8f02703ccd76cd16d09 (patch)
treee2310718e39cb0dcfe93942d4c990df9154a7ecd /arch/arm/include
parent89f883372fa60f604d136924baf3e89ff1870e9e (diff)
parentc81611c4e96f595a80d8be9367c385d2c116428b (diff)
Merge tag 'stable/for-linus-3.9-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
Pull Xen update from Konrad Rzeszutek Wilk: "This has two new ACPI drivers for Xen - a physical CPU offline/online and a memory hotplug. The way this works is that ACPI kicks the drivers and they make the appropiate hypercall to the hypervisor to tell it that there is a new CPU or memory. There also some changes to the Xen ARM ABIs and couple of fixes. One particularly nasty bug in the Xen PV spinlock code was fixed by Stefan Bader - and has been there since the 2.6.32! Features: - Xen ACPI memory and CPU hotplug drivers - allowing Xen hypervisor to be aware of new CPU and new DIMMs - Cleanups Bug-fixes: - Fixes a long-standing bug in the PV spinlock wherein we did not kick VCPUs that were in a tight loop. - Fixes in the error paths for the event channel machinery" Fix up a few semantic conflicts with the ACPI interface changes in drivers/xen/xen-acpi-{cpu,mem}hotplug.c. * tag 'stable/for-linus-3.9-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen: event channel arrays are xen_ulong_t and not unsigned long xen: Send spinlock IPI to all waiters xen: introduce xen_remap, use it instead of ioremap xen: close evtchn port if binding to irq fails xen-evtchn: correct comment and error output xen/tmem: Add missing %s in the printk statement. xen/acpi: move xen_acpi_get_pxm under CONFIG_XEN_DOM0 xen/acpi: ACPI cpu hotplug xen/acpi: Move xen_acpi_get_pxm to Xen's acpi.h xen/stub: driver for CPU hotplug xen/acpi: ACPI memory hotplug xen/stub: driver for memory hotplug xen: implement updated XENMEM_add_to_physmap_range ABI xen/smp: Move the common CPU init code a bit to prep for PVH patch.
Diffstat (limited to 'arch/arm/include')
2 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/include/asm/xen/events.h b/arch/arm/include/asm/xen/events.h
index 94b4e9020b0..5c27696de14 100644
--- a/arch/arm/include/asm/xen/events.h
+++ b/arch/arm/include/asm/xen/events.h
@@ -15,4 +15,26 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
return raw_irqs_disabled_flags(regs->ARM_cpsr);
+ * We cannot use xchg because it does not support 8-byte
+ * values. However it is safe to use {ldr,dtd}exd directly because all
+ * platforms which Xen can run on support those instructions.
+ */
+static inline xen_ulong_t xchg_xen_ulong(xen_ulong_t *ptr, xen_ulong_t val)
+ xen_ulong_t oldval;
+ unsigned int tmp;
+ wmb();
+ asm volatile("@ xchg_xen_ulong\n"
+ "1: ldrexd %0, %H0, [%3]\n"
+ " strexd %1, %2, %H2, [%3]\n"
+ " teq %1, #0\n"
+ " bne 1b"
+ : "=&r" (oldval), "=&r" (tmp)
+ : "r" (val), "r" (ptr)
+ : "memory", "cc");
+ return oldval;
#endif /* _ASM_ARM_XEN_EVENTS_H */
diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
index c6b9096cef9..30cdacb675a 100644
--- a/arch/arm/include/asm/xen/page.h
+++ b/arch/arm/include/asm/xen/page.h
@@ -1,6 +1,7 @@
+#include <asm/mach/map.h>
#include <asm/page.h>
#include <asm/pgtable.h>
@@ -86,4 +87,7 @@ static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
return __set_phys_to_machine(pfn, mfn);
+#define xen_remap(cookie, size) __arm_ioremap((cookie), (size), MT_MEMORY);
#endif /* _ASM_ARM_XEN_PAGE_H */