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drivers/edac/i3000: document type promotion 

By popular request, add a comment documenting the implicit type promotion
here.

Signed-off-by: Jason Uhlenkott <juhlenko@akamai.com>
Signed-off-by: Doug Thompson <dougthompson@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jason Uhlenkott 2008-02-07 00:15:05 -08:00 committed by Linus Torvalds
parent 7ed31e0fa0
commit 870897a5ab
1 changed files with 7 additions and 0 deletions
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7
drivers/edac/i3000_edac.c
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@ -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;