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do_mmap: give addr argument a chance even if not MAP_FIXED

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hugectl relies on that to check if a range is free

Change-Id: I97963eef15c866f642e884b063b5caf5d827c776
This commit is contained in:
Dominique Martinet
2018-09-20 13:10:17 +09:00
committed by Dominique Martinet
parent 9a0eb915fb
commit f17c30da07
2 changed files with 19 additions and 3 deletions
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11
kernel/syscall.c
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@ -1533,13 +1533,21 @@ static int search_free_space(size_t len, int pgshift, uintptr_t *addrp)
struct thread *thread = cpu_local_var(current);
struct vm_regions *region = &thread->vm->region;
intptr_t addr;
int error;
int error = 0;
struct vm_range *range;
size_t pgsize = (size_t)1 << pgshift;
dkprintf("%s: len: %lu, pgshift: %d\n",
__FUNCTION__, len, pgshift);
/* try given addr first */
addr = *addrp;
if (addr != 0) {
range = lookup_process_memory_range(thread->vm, addr, addr+len);
if (range == NULL)
goto out;
}
addr = region->map_end;
for (;;) {
addr = (addr + pgsize - 1) & ~(pgsize - 1);
@ -1560,7 +1568,6 @@ static int search_free_space(size_t len, int pgshift, uintptr_t *addrp)
}
region->map_end = addr + len;
error = 0;
*addrp = addr;
out: