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IB: Replace ib_umem page_size by page_shift

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Size of pages are held by struct ib_umem in page_size field.

It is better to store it as an exponent, because page size by nature
is always power-of-two and used as a factor, divisor or ilog2's argument.

The conversion of page_size to be page_shift allows to have portable
code and avoid following error while compiling on ARM:

  ERROR: "__aeabi_uldivmod" [drivers/infiniband/core/ib_core.ko] undefined!

CC: Selvin Xavier <selvin.xavier@broadcom.com>
CC: Steve Wise <swise@chelsio.com>
CC: Lijun Ou <oulijun@huawei.com>
CC: Shiraz Saleem <shiraz.saleem@intel.com>
CC: Adit Ranadive <aditr@vmware.com>
CC: Dennis Dalessandro <dennis.dalessandro@intel.com>
CC: Ram Amrani <Ram.Amrani@Cavium.com>
Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Acked-by: Ram Amrani <Ram.Amrani@cavium.com>
Acked-by: Shiraz Saleem <shiraz.saleem@intel.com>
Acked-by: Selvin Xavier <selvin.xavier@broadcom.com>
Acked-by: Selvin Xavier <selvin.xavier@broadcom.com>
Acked-by: Adit Ranadive <aditr@vmware.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Artemy Kovalyov
2017-04-05 09:23:50 +03:00
committed by Doug Ledford
parent 8d2216be28
commit 3e7e1193e2
23 changed files with 67 additions and 77 deletions
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4
include/rdma/ib_umem.h
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@@ -44,7 +44,7 @@ struct ib_umem {
struct ib_ucontext *context;
size_t length;
unsigned long address;
int page_size;
int page_shift;
int writable;
int hugetlb;
struct work_struct work;
@@ -60,7 +60,7 @@ struct ib_umem {
/* Returns the offset of the umem start relative to the first page. */
static inline int ib_umem_offset(struct ib_umem *umem)
{
return umem->address & ((unsigned long)umem->page_size - 1);
return umem->address & (BIT(umem->page_shift) - 1);
}
/* Returns the first page of an ODP umem. */