[SCM] GNU Mach branch, master, updated. v1.6-55-g844fb10

[Richard Braun]

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- Log -----------------------------------------------------------------
commit 844fb104f5c0c50b94cbf6ab8fb2e97caa4bc7b3
Author: Richard Braun <address@hidden>
Date:   Wed Mar 9 23:06:25 2016 +0100

    Fix stack allocation on Xen
    
    Stack allocation on Xen can fail because of fragmentation. This change
    makes stack allocation use the slab allocator.
    
    * kern/thread.c (thread_stack_cache): New global variable.
    (stack_alloc): Use kmem_cache_alloc instead of vm_page_grab_contig.
    (stack_collect): Use kmem_cache_free instead of vm_page_free_contig.
    (kmem_cache_init): Initialize thread_stack_cache.

commit 2ac2a45ace8fd00b3ac42e3be9dbfbaad95ac819
Author: Richard Braun <address@hidden>
Date:   Wed Mar 9 23:01:04 2016 +0100

    Relax slab allocation alignment constraint
    
    * kern/slab.c (kmem_pagealloc_virtual): Pass alignment to function,
    call kmem_alloc_aligned when greater than a page.
    (kmem_pagealloc): Pass alignment to function.
    (kmem_slab_create): Update call to kmem_pagealloc.
    (kalloc): Likewise.
    (kmem_cache_compute_properties): Fix handling of color with large slab
    sizes.
    (kmem_cache_init): Allow alignment greater than the page size.

-----------------------------------------------------------------------

Summary of changes:
 kern/slab.c   |   20 ++++++++++++--------
 kern/thread.c |   33 ++++++++++++---------------------
 2 files changed, 24 insertions(+), 29 deletions(-)


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