[Minios-devel] [UNIKRAFT PATCH 2/3] 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 a250547..75ad0b8 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, STACK_SIZE_PAGE_ORDER);
+       uk_posix_memalign(allocator, &stack, STACK_SIZE, STACK_SIZE_PAGE_ORDER);
        if (stack == NULL) {
                uk_pr_warn("Error allocating thread stack.");
                return NULL;
-- 
2.7.4


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