[PATCH] LOG2: Implement a general integer log2 facility in the kernel

This facility provides three entry points:

	ilog2()		Log base 2 of unsigned long
	ilog2_u32()	Log base 2 of u32
	ilog2_u64()	Log base 2 of u64

These facilities can either be used inside functions on dynamic data:

	int do_something(long q)
	{
		...;
		y = ilog2(x)
		...;
	}

Or can be used to statically initialise global variables with constant values:

	unsigned n = ilog2(27);

When performing static initialisation, the compiler will report "error:
initializer element is not constant" if asked to take a log of zero or of
something not reducible to a constant.  They treat negative numbers as
unsigned.

When not dealing with a constant, they fall back to using fls() which permits
them to use arch-specific log calculation instructions - such as BSR on
x86/x86_64 or SCAN on FRV - if available.

[akpm@osdl.org: MMC fix]
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David Howells <dhowells@redhat.com>
Cc: Wojtek Kaniewski <wojtekka@toxygen.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

6 files changed, 10 insertions, 10 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c
index 21422a3336ad..7ec7c4b937f9 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -124,7 +124,7 @@ static int mthca_query_device(struct ib_device *ibdev,
                 props->max_map_per_fmr = 255;
         else
                 props->max_map_per_fmr =
-                        (1 << (32 - long_log2(mdev->limits.num_mpts))) - 1;
+                        (1 << (32 - ilog2(mdev->limits.num_mpts))) - 1;
 
         err = 0;
  out:
@@ -816,7 +816,7 @@ static int mthca_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *uda
                 lkey = ucmd.lkey;
         }
 
-        ret = mthca_RESIZE_CQ(dev, cq->cqn, lkey, long_log2(entries), &status);
+        ret = mthca_RESIZE_CQ(dev, cq->cqn, lkey, ilog2(entries), &status);
         if (status)
                 ret = -EINVAL;
 
diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c
index 33e3ba7937f1..d844a2569b47 100644
--- a/drivers/infiniband/hw/mthca/mthca_qp.c
+++ b/drivers/infiniband/hw/mthca/mthca_qp.c
@@ -636,11 +636,11 @@ int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask,
 
         if (mthca_is_memfree(dev)) {
                 if (qp->rq.max)
-                        qp_context->rq_size_stride = long_log2(qp->rq.max) << 3;
+                        qp_context->rq_size_stride = ilog2(qp->rq.max) << 3;
                 qp_context->rq_size_stride |= qp->rq.wqe_shift - 4;
 
                 if (qp->sq.max)
-                        qp_context->sq_size_stride = long_log2(qp->sq.max) << 3;
+                        qp_context->sq_size_stride = ilog2(qp->sq.max) << 3;
                 qp_context->sq_size_stride |= qp->sq.wqe_shift - 4;
         }
 
diff --git a/drivers/infiniband/hw/mthca/mthca_srq.c b/drivers/infiniband/hw/mthca/mthca_srq.c
index 34d2c4768962..10684da33d58 100644
--- a/drivers/infiniband/hw/mthca/mthca_srq.c
+++ b/drivers/infiniband/hw/mthca/mthca_srq.c
@@ -120,7 +120,7 @@ static void mthca_arbel_init_srq_context(struct mthca_dev *dev,
 
         memset(context, 0, sizeof *context);
 
-        logsize = long_log2(srq->max);
+        logsize = ilog2(srq->max);
         context->state_logsize_srqn = cpu_to_be32(logsize << 24 | srq->srqn);
         context->lkey = cpu_to_be32(srq->mr.ibmr.lkey);
         context->db_index = cpu_to_be32(srq->db_index);
@@ -213,7 +213,7 @@ int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd,
         if (!mthca_is_memfree(dev) && (ds > dev->limits.max_desc_sz))
                 return -EINVAL;
 
-        srq->wqe_shift = long_log2(ds);
+        srq->wqe_shift = ilog2(ds);
 
         srq->srqn = mthca_alloc(&dev->srq_table.alloc);
         if (srq->srqn == -1)
diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c
index 5e122501fd80..3aedd59b8a84 100644
--- a/drivers/infiniband/ulp/iser/iser_memory.c
+++ b/drivers/infiniband/ulp/iser/iser_memory.c
@@ -114,7 +114,7 @@ int iser_start_rdma_unaligned_sg(struct iscsi_iser_cmd_task  *iser_ctask,
 
         if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
                 mem = (void *)__get_free_pages(GFP_NOIO,
-                      long_log2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
+                      ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
         else
                 mem = kmalloc(cmd_data_len, GFP_NOIO);
 
@@ -211,7 +211,7 @@ void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *iser_ctask,
 
         if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
                 free_pages((unsigned long)mem_copy->copy_buf,
-                           long_log2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
+                           ilog2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
         else
                 kfree(mem_copy->copy_buf);
 
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index a1086ee8cccd..96152868525b 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -220,7 +220,7 @@ static int crypt_iv_benbi_ctr(struct crypt_config *cc, struct dm_target *ti,
                               const char *opts)
 {
         unsigned int bs = crypto_blkcipher_blocksize(cc->tfm);
-        int log = long_log2(bs);
+        int log = ilog2(bs);
 
         /* we need to calculate how far we must shift the sector count
          * to get the cipher block count, we use this shift in _gen */
diff --git a/drivers/mmc/tifm_sd.c b/drivers/mmc/tifm_sd.c
index e846499a004c..f18ad998b3cb 100644
--- a/drivers/mmc/tifm_sd.c
+++ b/drivers/mmc/tifm_sd.c
@@ -387,7 +387,7 @@ static void tifm_sd_prepare_data(struct tifm_sd *card, struct mmc_command *cmd)
 
         writel(TIFM_FIFO_INT_SETALL,
                 sock->addr + SOCK_DMA_FIFO_INT_ENABLE_CLEAR);
-        writel(long_log2(cmd->data->blksz) - 2,
+        writel(ilog2(cmd->data->blksz) - 2,
                         sock->addr + SOCK_FIFO_PAGE_SIZE);
         writel(TIFM_FIFO_ENABLE, sock->addr + SOCK_FIFO_CONTROL);
         writel(TIFM_FIFO_INTMASK, sock->addr + SOCK_DMA_FIFO_INT_ENABLE_SET);