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-rw-r--r--arch/um/os-Linux/process.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index 3505f44f8a2..233be2f4f8c 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.c
@@ -206,29 +206,36 @@ int os_drop_memory(void *addr, int length)
int can_drop_memory(void)
{
void *addr;
- int fd;
+ int fd, ok = 0;
printk("Checking host MADV_REMOVE support...");
fd = create_mem_file(UM_KERN_PAGE_SIZE);
if(fd < 0){
printk("Creating test memory file failed, err = %d\n", -fd);
- return 0;
+ goto out;
}
addr = mmap64(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
if(addr == MAP_FAILED){
printk("Mapping test memory file failed, err = %d\n", -errno);
- return 0;
+ goto out_close;
}
if(madvise(addr, UM_KERN_PAGE_SIZE, MADV_REMOVE) != 0){
printk("MADV_REMOVE failed, err = %d\n", -errno);
- return 0;
+ goto out_unmap;
}
printk("OK\n");
- return 1;
+ ok = 1;
+
+out_unmap:
+ munmap(addr, UM_KERN_PAGE_SIZE);
+out_close:
+ close(fd);
+out:
+ return ok;
}
void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int))