[PATCHv2] init.h: add some more documentation to __ref* tags

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The __ref* tags may have been confusing for new kernel
developers (I was confused by them for sure) so adding a few
more sentences to comment to clear things up for people who
see those for the first time.

Signed-off-by: Michal Nazarewicz <m.nazarewicz@xxxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
---
 include/linux/init.h |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

> On Fri, Aug 06, 2010 at 11:23:01AM +0200, Michal Nazarewicz wrote:
>> + * modpost not to issue a warning.  Intended semantics is that a code or
>> + * data tagged __ref* can reference code or data from init section without
>> + * producing warning (of course, no warning does not mean code is correct,

On Fri, 06 Aug 2010 11:29:14 +0200, Uwe Kleine-K철nig wrote:
> s/producing warning/producing a warning/ ?

Fixed.

>> + * so this need to be checked).

> and maybe add something like: So optimally document why the __ref is needed
> and why it's OK.

Fixed.


diff --git a/include/linux/init.h b/include/linux/init.h
index de99430..577671c 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -46,16 +46,23 @@
 #define __exitdata	__section(.exit.data)
 #define __exit_call	__used __section(.exitcall.exit)
 
-/* modpost check for section mismatches during the kernel build.
+/*
+ * modpost check for section mismatches during the kernel build.
  * A section mismatch happens when there are references from a
  * code or data section to an init section (both code or data).
  * The init sections are (for most archs) discarded by the kernel
  * when early init has completed so all such references are potential bugs.
  * For exit sections the same issue exists.
+ *
  * The following markers are used for the cases where the reference to
  * the *init / *exit section (code or data) is valid and will teach
- * modpost not to issue a warning.
- * The markers follow same syntax rules as __init / __initdata. */
+ * modpost not to issue a warning.  Intended semantics is that a code or
+ * data tagged __ref* can reference code or data from init section without
+ * producing a warning (of course, no warning does not mean code is
+ * correct, so optimally document why the __ref is needed and why it's OK).
+ *
+ * The markers follow same syntax rules as __init / __initdata.
+ */
 #define __ref            __section(.ref.text) noinline
 #define __refdata        __section(.ref.data)
 #define __refconst       __section(.ref.rodata)
-- 
1.7.1

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