Whilst the default SLUB allocator happily just merges the original allocation flags from kmem_cache_create() with those passed through kmem_cache_alloc(), there is a code path in the SLAB allocator which will aggressively BUG_ON() if the cache was created with SLAB_CACHE_DMA but GFP_DMA is not specified for an allocation.
Keep the peace by adding GFP_DMA when allocating a table. Reported-by: Geert Uytterhoeven <[email protected]> Signed-off-by: Robin Murphy <[email protected]> --- drivers/iommu/io-pgtable-arm-v7s.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c index 9fcceb1..9488e3c 100644 --- a/drivers/iommu/io-pgtable-arm-v7s.c +++ b/drivers/iommu/io-pgtable-arm-v7s.c @@ -192,7 +192,7 @@ static void *__arm_v7s_alloc_table(int lvl, gfp_t gfp, if (lvl == 1) table = (void *)__get_dma_pages(__GFP_ZERO, get_order(size)); else if (lvl == 2) - table = kmem_cache_zalloc(data->l2_tables, gfp); + table = kmem_cache_zalloc(data->l2_tables, gfp | GFP_DMA); if (table && !selftest_running) { dma = dma_map_single(dev, table, size, DMA_TO_DEVICE); if (dma_mapping_error(dev, dma)) -- 2.7.2.333.g70bd996.dirty _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
