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drivers/edac/i3000: document type promotion

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

Signed-off-by: Jason Uhlenkott <[email protected]>
Signed-off-by: Doug Thompson <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jason Uhlenkott 2008-02-07 00:15:05 -08:00 • committed by Linus Torvalds
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)
/*
* 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)
{
deap >>= PAGE_SHIFT;