x86: Mark device_nb as static and fix NULL noise

This sparse warning:

  arch/x86/kernel/amd_iommu.c:1195:23: warning: symbol 'device_nb' was not declared. Should it be static?

triggers because device_nb is global but is only used in a
single .c file. change device_nb to static to fix that - this
also addresses the sparse warning.

This sparse warning:

  arch/x86/kernel/amd_iommu.c:1766:10: warning: Using plain integer as NULL pointer

triggers because plain integer 0 is used in place of a NULL
pointer. change 0 to NULL to fix that - this also address the
sparse warning.

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Cc: Joerg Roedel <joerg.roedel@amd.com>
LKML-Reference: <1246458194.6940.20.camel@hpdv5.satnam>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 9372f0406ad4..6c99f5037801 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1192,7 +1192,7 @@ out:
         return 0;
 }
 
-struct notifier_block device_nb = {
+static struct notifier_block device_nb = {
         .notifier_call = device_change_notifier,
 };
 
@@ -1763,7 +1763,7 @@ static void *alloc_coherent(struct device *dev, size_t size,
         flag |= __GFP_ZERO;
         virt_addr = (void *)__get_free_pages(flag, get_order(size));
         if (!virt_addr)
-                return 0;
+                return NULL;
 
         paddr = virt_to_phys(virt_addr);