[Minios-devel] [UNIKRAFT PATCH v6 4/5] lib/uksched: use posix_memalign to allocate stack

[Hugo Lefeuvre <hugo.lefeuvre@xxxxxxxxx>]

uk_thread_current indentifies the current stack using STACK_MASK_TOP. As a
consequence the stack should be aligned at STACK_SIZE. However the stack is
allocated using palloc which only guarantees page alignment.

Allocate the stack using posix_memalign, explicitely requesting an
alignment at STACK_SIZE.

Signed-off-by: Hugo Lefeuvre <hugo.lefeuvre@xxxxxxxxx>

diff --git a/lib/uksched/sched.c b/lib/uksched/sched.c
index 281846d..94ac5aa 100644
--- a/lib/uksched/sched.c
+++ b/lib/uksched/sched.c
@@ -141,7 +141,7 @@ static void *create_stack(struct uk_alloc *allocator)
 {
        void *stack;
 
-       stack = uk_palloc(allocator, 1ul << STACK_SIZE_PAGE_ORDER);
+       uk_posix_memalign(allocator, &stack, STACK_SIZE, STACK_SIZE);
        if (stack == NULL) {
                uk_pr_warn("Error allocating thread stack.");
                return NULL;
@@ -250,7 +250,7 @@ void uk_sched_thread_destroy(struct uk_sched *sched, struct 
uk_thread *thread)
 
        UK_TAILQ_REMOVE(&sched->exited_threads, thread, thread_list);
        uk_thread_fini(thread, sched->allocator);
-       uk_pfree(sched->allocator, thread->stack, 1ul << STACK_SIZE_PAGE_ORDER);
+       uk_free(sched->allocator, thread->stack);
        if (thread->tls)
                uk_free(sched->allocator, thread->tls);
        uk_free(sched->allocator, thread);
-- 
2.7.4


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