@@ -81,10 +81,10 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
unsigned long len, unsigned long long highmem)
{
unsigned long reserve = reserve_end - start;
- long map_size = len - reserve;
+ unsigned long map_size = len - reserve;
int err;
- if(map_size <= 0) {
+ if (len <= reserve) {
os_warn("Too few physical memory! Needed=%lu, given=%lu\n",
reserve, len);
exit(1);
@@ -95,7 +95,7 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
err = os_map_memory((void *) reserve_end, physmem_fd, reserve,
map_size, 1, 1, 1);
if (err < 0) {
- os_warn("setup_physmem - mapping %ld bytes of memory at 0x%p "
+ os_warn("setup_physmem - mapping %lu bytes of memory at 0x%p "
"failed - errno = %d\n", map_size,
(void *) reserve_end, err);
exit(1);
This issue happens when the real map size is greater than LONG_MAX, which can be easily triggered on UML/i386. Fixes: fe205bdd1321 ("um: Print minimum physical memory requirement") Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> --- arch/um/kernel/physmem.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)