On Mon, 14 Jan 2019 15:24:33 +0530 "Aneesh Kumar K.V" 
<aneesh.ku...@linux.ibm.com> wrote:

> This patch adds PF_MEMALLOC_NOCMA which make sure any allocation in that 
> context
> is marked non-movable and hence cannot be satisfied by CMA region.
> 
> This is useful with get_user_pages_longterm where we want to take a page pin 
> by
> migrating pages from CMA region. Marking the section PF_MEMALLOC_NOCMA ensures
> that we avoid unnecessary page migration later.
> 
> ...
>
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1406,6 +1406,7 @@ extern struct pid *cad_pid;
>  #define PF_RANDOMIZE         0x00400000      /* Randomize virtual address 
> space */
>  #define PF_SWAPWRITE         0x00800000      /* Allowed to write to swap */
>  #define PF_MEMSTALL          0x01000000      /* Stalled due to lack of 
> memory */
> +#define PF_MEMALLOC_NOCMA    0x02000000      /* All allocation request will 
> have _GFP_MOVABLE cleared */
>  #define PF_NO_SETAFFINITY    0x04000000      /* Userland is not allowed to 
> meddle with cpus_allowed */
>  #define PF_MCE_EARLY         0x08000000      /* Early kill for mce process 
> policy */
>  #define PF_MUTEX_TESTER              0x20000000      /* Thread belongs to 
> the rt mutex tester */

This flag has been taken by PF_UMH so I moved it to 0x10000000.

And we have now run out of PF_ flags.

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