mempool: Fix off_t cast warning on 32-bit

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I93978e7f0f583ae4a9bf62d3f707258c385bb0a8

diff --git a/src/rseq-mempool.c b/src/rseq-mempool.c
index d2bc0c9de886ab0f3e462b582345a6f1577bfbba..a54960625f2eca541a2453e565714467147379b3 100644 (file)
--- a/src/rseq-mempool.c
+++ b/src/rseq-mempool.c
@@ -223,6 +223,12 @@ struct free_list_node *__rseq_percpu_to_free_list_ptr(const struct rseq_mempool
        return (struct free_list_node *) p;
 }
 
+static
+off_t ptr_to_off_t(void *p)
+{
+       return (off_t) (uintptr_t) p;
+}
+
 static
 int memcmpbyte(const char *s, int c, size_t n)
 {
@@ -589,7 +595,7 @@ int rseq_mempool_range_destroy(struct rseq_mempool *pool,
         */
        if (range->init) {
                ret = fallocate(memfd.fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
-                       (off_t) range->init, pool->attr.stride);
+                       ptr_to_off_t(range->init), pool->attr.stride);
                if (ret)
                        return ret;
                range->init = NULL;
@@ -688,7 +694,7 @@ int rseq_memfd_reserve_init(void *init, size_t init_len)
        size_t reserve_len;
 
        pthread_mutex_lock(&memfd.lock);
-       reserve_len = (size_t) init + init_len;
+       reserve_len = (size_t) ptr_to_off_t(init) + init_len;
        if (reserve_len > memfd.reserved_size) {
                if (ftruncate(memfd.fd, (off_t) reserve_len)) {
                        ret = -1;
@@ -740,7 +746,7 @@ struct rseq_mempool_range *rseq_mempool_range_create(struct rseq_mempool *pool)
                        goto error_alloc;
                if (mmap(range->init, pool->attr.stride, PROT_READ | PROT_WRITE,
                                MAP_SHARED | MAP_FIXED, memfd.fd,
-                               (off_t) range->init) != (void *) range->init) {
+                               ptr_to_off_t(range->init)) != (void *) range->init) {
                        goto error_alloc;
                }
                assert(pool->attr.type == MEMPOOL_TYPE_PERCPU);
@@ -755,7 +761,7 @@ struct rseq_mempool_range *rseq_mempool_range_create(struct rseq_mempool *pool)
                                size_t len = pool->attr.stride;
 
                                if (mmap(p, len, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED,
-                                               memfd.fd, (off_t) range->init) != (void *) p) {
+                                               memfd.fd, ptr_to_off_t(range->init)) != (void *) p) {
                                        goto error_alloc;
                                }
                        }