Another issue with MFC

[Warner Losh]

On Dec 6, 2013, at 4:41 PM, Ian Lepore wrote:

> On Thu, 2013-12-05 at 22:22 -0700, Warner Losh wrote:
>> Hey Scott,
>> 
>> I've found another problem. After the MFC of r251874, Atmel ARM no longer can boot off NFS because the network breaks across this commit...
>> 
>> ------------------------------------------------------------------------
>> r251874 | scottl | 2013-06-17 18:36:53 -0600 (Mon, 17 Jun 2013) | 34 lines
>> 
>> Big MFC of the physbio changes necessary for unmapped I/O.  These changes
>> have been in production at Netflix for several months with significant
>> success.
>> 
>> MFC r246713:
>> 
>> Reform the busdma API so that new types may be added without modifying
>> every architecture's busdma_machdep.c.  It is done by unifying the
>> bus_dmamap_load_buffer() routines so that they may be called from MI
>> code.  The MD busdma is then given a chance to do any final processing
>> in the complete() callback.
>> 
>> MFC r249538:
>> Some compilers issue a warning when wider integer is casted to narrow
>> pointer.  Supposedly shut down the warning by casting through
>> uintptr_t.
>> 
>> MFC r251479:
>> Simplify the checking of flags for cam_periph_mapmem().  This gets rid of
>> a lot of code redundancy and grossness at very minor expense.
>> 
>> MFC r251837:
>> MFC r251842:
>> Add infrastructure for doing compatibility shims, as has been sorely
>> needed for the last 10 years.  Far too much of the internal API is
>> exposed, and every small adjustment causes applications to stop working.
>> To kick this off, bump the API version to 0x17 as should have been done
>> with r246713, but add shims to compensate.  Thanks to the shims, there
>> should be no visible change in application behavior.
>> 
>> Submitted by:	kib, jeffr
>> Approved by:	kib
>> Obtained from:	Netflix
>> 
>> ------------------------------------------------------------------------
>> 
>> Any ideas?
>> 
>> Warner
> 
> I wonder if an MFC of r246881 would help?


If I update to r251874 and then apply this diff, then I don't see this issue. Thanks! I'll see if my latest fix + this MFC makes it work...

Warner