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Commit 870897a5ab60a6afeba0a7eff42d21faf79edf33

Authored by Jason Uhlenkott
Committed by Linus Torvalds
1 parent 7ed31e0fa0
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

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>

Showing 1 changed file with 7 additions and 0 deletions Side-by-side Diff

drivers/edac/i3000_edac.c
Diff comments   View file @ 870897a
... ... @@ -44,6 +44,13 @@
44 44 */
45 45 #define I3000_DEAP_GRAIN (1 << 7)
46 46  
  47 +/*
  48 + * Helper functions to decode the DEAP/EDEAP hardware registers.
  49 + *
  50 + * The type promotion here is deliberate; we're deriving an
  51 + * unsigned long pfn and offset from hardware regs which are u8/u32.
  52 + */
  53 +
47 54 static inline unsigned long deap_pfn(u8 edeap, u32 deap)
48 55 {
49 56 deap >>= PAGE_SHIFT;