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| author | Jason Uhlenkott <juhlenko@akamai.com> | 2008-02-07 00:15:05 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-07 08:42:23 -0800 |
| commit | 870897a5ab60a6afeba0a7eff42d21faf79edf33 (patch) | |
| tree | d92a322c18f7e20bf0641151e05596aa46b25719 /drivers | |
| parent | 7ed31e0fa0e595a8840dbb6c60a7207b5bd90333 (diff) | |
| download | lwn-870897a5ab60a6afeba0a7eff42d21faf79edf33.tar.gz lwn-870897a5ab60a6afeba0a7eff42d21faf79edf33.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/edac/i3000_edac.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/edac/i3000_edac.c b/drivers/edac/i3000_edac.c index b813f356b390..5d4292811c14 100644 --- a/drivers/edac/i3000_edac.c +++ b/drivers/edac/i3000_edac.c @@ -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; |