提交 870897a5 编写于 作者: J Jason Uhlenkott 提交者: Linus Torvalds

drivers/edac/i3000: document type promotion

By popular request, add a comment documenting the implicit type promotion
here.
Signed-off-by: NJason Uhlenkott <juhlenko@akamai.com>
Signed-off-by: NDoug Thompson <dougthompson@xmission.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 7ed31e0f
...@@ -44,6 +44,13 @@ ...@@ -44,6 +44,13 @@
*/ */
#define I3000_DEAP_GRAIN (1 << 7) #define I3000_DEAP_GRAIN (1 << 7)
/*
* Helper functions to decode the DEAP/EDEAP hardware registers.
*
* The type promotion here is deliberate; we're deriving an
* unsigned long pfn and offset from hardware regs which are u8/u32.
*/
static inline unsigned long deap_pfn(u8 edeap, u32 deap) static inline unsigned long deap_pfn(u8 edeap, u32 deap)
{ {
deap >>= PAGE_SHIFT; deap >>= PAGE_SHIFT;
......
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