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env/vtophys: mark exceptional cases as unlikely

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Make sure the compiler arranges the fast path as the fallthrough case by
annotating the checks in spdk_vtophys().

Change-Id: If0fc3149297131894b5c7a94bff31bf8ee40326e
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Daniel Verkamp 2017-02-21 16:55:15 -07:00
parent f314f0ca4f
commit b08738fe92
1 changed files with 3 additions and 2 deletions
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5
lib/env_dpdk/vtophys.c
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@ -44,6 +44,7 @@
#include <rte_eal_memconfig.h>
#include "spdk/assert.h"
#include "spdk/likely.h"
/* x86-64 userspace virtual addresses use only the low 47 bits [0..46],
* which is enough to cover 128 TB.
@ -329,7 +330,7 @@ spdk_vtophys(void *buf)
uint64_t vaddr, vfn_2mb, paddr_2mb;
vaddr = (uint64_t)buf;
if (vaddr & ~MASK_128TB) {
if (spdk_unlikely(vaddr & ~MASK_128TB)) {
printf("invalid usermode virtual address %p\n", buf);
return SPDK_VTOPHYS_ERROR;
}
@ -339,7 +340,7 @@ spdk_vtophys(void *buf)
idx_1gb = MAP_1GB_IDX(vfn_2mb);
map_1gb = vtophys_map_128tb.map[idx_128tb];
if (!map_1gb) {
if (spdk_unlikely(!map_1gb)) {
return SPDK_VTOPHYS_ERROR;
}