[PATCH] powerpc/eeh_cache: fix a W=1 kernel-doc warning

[Qian Cai <cai@lca.pw>]

The opening comment mark "/**" is reserved for kernel-doc comments, so
it will generate a warning with "make W=1".

arch/powerpc/kernel/eeh_cache.c:37: warning: cannot understand function
prototype: 'struct pci_io_addr_range

Since this is not a kernel-doc for the struct below, but rather an
overview of this source eeh_cache.c, just use the free-form comments
kernel-doc syntax instead.

Signed-off-by: Qian Cai <cai@lca.pw>
---
 arch/powerpc/kernel/eeh_cache.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/kernel/eeh_cache.c b/arch/powerpc/kernel/eeh_cache.c
index 320472373122..05ffd32b3416 100644
--- a/arch/powerpc/kernel/eeh_cache.c
+++ b/arch/powerpc/kernel/eeh_cache.c
@@ -18,6 +18,8 @@
 
 
 /**
+ * DOC: Overview
+ *
  * The pci address cache subsystem.  This subsystem places
  * PCI device address resources into a red-black tree, sorted
  * according to the address range, so that given only an i/o
@@ -34,6 +36,7 @@
  * than any hash algo I could think of for this problem, even
  * with the penalty of slow pointer chases for d-cache misses).
  */
+
 struct pci_io_addr_range {
 	struct rb_node rb_node;
 	resource_size_t addr_lo;
-- 
1.8.3.1