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sparc64: Adjust vmalloc region size based upon available virtual address bits.

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In order to accomodate embedded per-cpu allocation with large numbers
of cpus and numa nodes, we have to use as much virtual address space
as possible for the vmalloc region.  Otherwise we can get things like:

PERCPU: max_distance=0x380001c10000 too large for vmalloc space 0xff00000000

So, once we select a value for PAGE_OFFSET, derive the size of the
vmalloc region based upon that.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Bob Picco <bob.picco@oracle.com>
This commit is contained in:
David S. Miller
2014-09-27 11:05:21 -07:00
parent 7c0fa0f24b
commit bb4e6e85da
4 changed files with 28 additions and 20 deletions
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8
arch/sparc/kernel/ktlb.S
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@@ -199,8 +199,8 @@ kvmap_dtlb_nonlinear:
#ifdef CONFIG_SPARSEMEM_VMEMMAP
/* Do not use the TSB for vmemmap. */
mov (VMEMMAP_BASE >> 40), %g5
sllx %g5, 40, %g5
sethi %hi(VMEMMAP_BASE), %g5
ldx [%g5 + %lo(VMEMMAP_BASE)], %g5
cmp %g4,%g5
bgeu,pn %xcc, kvmap_vmemmap
nop
@@ -212,8 +212,8 @@ kvmap_dtlb_tsbmiss:
sethi %hi(MODULES_VADDR), %g5
cmp %g4, %g5
blu,pn %xcc, kvmap_dtlb_longpath
mov (VMALLOC_END >> 40), %g5
sllx %g5, 40, %g5
sethi %hi(VMALLOC_END), %g5
ldx [%g5 + %lo(VMALLOC_END)], %g5
cmp %g4, %g5
bgeu,pn %xcc, kvmap_dtlb_longpath
nop