From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Subject: mm/process_vm_access.c: include compat.h mm/process_vm_access.c:277:5: error: implicit declaration of function 'in_compat_syscall'; did you mean 'in_ia32_syscall'? [-Werror=implicit-function-declaration] Fixes: 38dc5079da7081e "Fix compat regression in process_vm_rw()" Reported-by: syzbot+5b0d0de84d6c65b8dd2b@xxxxxxxxxxxxxxxxxxxxxxxxx Cc: Kyle Huey <me@xxxxxxxxxxxx> Cc: Jens Axboe <axboe@xxxxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/process_vm_access.c | 1 + 1 file changed, 1 insertion(+) --- a/mm/process_vm_access.c~mm-process_vm_accessc-include-compath +++ a/mm/process_vm_access.c @@ -9,6 +9,7 @@ #include <linux/mm.h> #include <linux/uio.h> #include <linux/sched.h> +#include <linux/compat.h> #include <linux/sched/mm.h> #include <linux/highmem.h> #include <linux/ptrace.h> _