diff options
| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2018-02-22 15:27:28 +0100 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-03-06 09:21:23 +1100 |
| commit | 15472423ce47d6397d08d48daaae8590c9f9f242 (patch) | |
| tree | 7f06b7bf75af5c3649a3c4f28144e4a50b3da72e /arch/powerpc/kernel/paca.c | |
| parent | powerpc/mm/slice: Fix hugepage allocation at hint address on 8xx (diff) | |
| download | linux-dev-15472423ce47d6397d08d48daaae8590c9f9f242.tar.xz linux-dev-15472423ce47d6397d08d48daaae8590c9f9f242.zip | |
powerpc/mm/slice: Allow up to 64 low slices
While the implementation of the "slices" address space allows
a significant amount of high slices, it limits the number of
low slices to 16 due to the use of a single u64 low_slices_psize
element in struct mm_context_t
On the 8xx, the minimum slice size is the size of the area
covered by a single PMD entry, ie 4M in 4K pages mode and 64M in
16K pages mode. This means we could have at least 64 slices.
In order to override this limitation, this patch switches the
handling of low_slices_psize to char array as done already for
high_slices_psize.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/paca.c')
| -rw-r--r-- | arch/powerpc/kernel/paca.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c index 95ffedf14885..2fd563d05831 100644 --- a/arch/powerpc/kernel/paca.c +++ b/arch/powerpc/kernel/paca.c @@ -265,7 +265,8 @@ void copy_mm_to_paca(struct mm_struct *mm) #ifdef CONFIG_PPC_MM_SLICES VM_BUG_ON(!mm->context.slb_addr_limit); get_paca()->mm_ctx_slb_addr_limit = mm->context.slb_addr_limit; - get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize; + memcpy(&get_paca()->mm_ctx_low_slices_psize, + &context->low_slices_psize, sizeof(context->low_slices_psize)); memcpy(&get_paca()->mm_ctx_high_slices_psize, &context->high_slices_psize, TASK_SLICE_ARRAY_SZ(mm)); #else /* CONFIG_PPC_MM_SLICES */ |