From: Roland Dreier Date: Fri, 19 Aug 2005 17:36:11 +0000 (-0700) Subject: [PATCH] IB/mthca: Handle context tables smaller than our chunk size X-Git-Tag: v2.6.14-rc1~1050^2~6 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d20a40192868082eff6fec729b311cb8463b4a21;p=linux-2.6 [PATCH] IB/mthca: Handle context tables smaller than our chunk size When creating a table in context memory where the table is smaller than our chunk size, we don't want to allocate and map a full chunk. Instead, allocate just enough memory to cover the table. This can be pretty simple because all tables are a power-of-2 size, so either the table is a multiple of the chunk size, or it's smaller than one chunk. Signed-off-by: Roland Dreier --- diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.c b/drivers/infiniband/hw/mthca/mthca_memfree.c index fba0a53ba6..1827400f18 100644 --- a/drivers/infiniband/hw/mthca/mthca_memfree.c +++ b/drivers/infiniband/hw/mthca/mthca_memfree.c @@ -286,6 +286,7 @@ struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev, { struct mthca_icm_table *table; int num_icm; + unsigned chunk_size; int i; u8 status; @@ -306,7 +307,11 @@ struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev, table->icm[i] = NULL; for (i = 0; i * MTHCA_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) { - table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT, + chunk_size = MTHCA_TABLE_CHUNK_SIZE; + if ((i + 1) * MTHCA_TABLE_CHUNK_SIZE > nobj * obj_size) + chunk_size = nobj * obj_size - i * MTHCA_TABLE_CHUNK_SIZE; + + table->icm[i] = mthca_alloc_icm(dev, chunk_size >> PAGE_SHIFT, (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) | __GFP_NOWARN); if (!table->icm[i])