[dpdk-dev] [PATCH v3 16/20] eal: make --no-huge use mmap instead of malloc

[Anatoly Burakov <anatoly.burakov@intel.com>]

This makes it possible to run DPDK without hugepage memory when VFIO
is used, as VFIO uses virtual addresses to set up DMA mappings.

Technically, malloc is just fine, but we want to guarantee that
memory will be page-aligned, so using mmap to be safe.

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/librte_eal/linuxapp/eal/eal_memory.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c b/lib/librte_eal/linuxapp/eal/eal_memory.c
index 5a10a80..3fc0d28 100644
--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -1031,7 +1031,13 @@ rte_eal_hugepage_init(void)
 
 	/* hugetlbfs can be disabled */
 	if (internal_config.no_hugetlbfs) {
-		addr = malloc(internal_config.memory);
+		addr = mmap(NULL, internal_config.memory, PROT_READ | PROT_WRITE,
+				MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+		if (addr == MAP_FAILED) {
+			RTE_LOG(ERR, EAL, "%s: mmap() failed: %s\n", __func__,
+					strerror(errno));
+			return -1;
+		}
 		mcfg->memseg[0].phys_addr = (phys_addr_t)(uintptr_t)addr;
 		mcfg->memseg[0].addr = addr;
 		mcfg->memseg[0].len = internal_config.memory;
-- 
1.8.1.4