Re: [PATCH kernel] powerpc: Bump minimum zone order for 4K system page size

2016-09-22 Thread Balbir Singh
On 23/09/16 14:51, Alexey Kardashevskiy wrote: > The moderm kernel on powernv platform cannot possibly boot with values > less than 12 as the default DMA window of 2GB requires > (2<<30)/4096 TCEs which is 4MB of contiguous memory, log2(4M) == 22 > so anything less than 12 won't work. > >

[PATCH kernel] powerpc: Bump minimum zone order for 4K system page size

2016-09-22 Thread Alexey Kardashevskiy
The moderm kernel on powernv platform cannot possibly boot with values less than 12 as the default DMA window of 2GB requires (2<<30)/4096 TCEs which is 4MB of contiguous memory, log2(4M) == 22 so anything less than 12 won't work. Signed-off-by: Alexey Kardashevskiy --- I am