On October 13, 2025 7:06:55 AM PDT, Dave Hansen <[email protected]> wrote: >On 10/13/25 02:20, Thomas Weißschuh wrote: >> -int __vdso_getcpu(unsigned int *cpu, unsigned int *node, struct >> getcpu_cache *unused); >> -int __vdso_getcpu(unsigned int *cpu, unsigned int *node, struct >> getcpu_cache *unused) >> +int __vdso_getcpu(unsigned int *cpu, unsigned int *node, void *unused); >> +int __vdso_getcpu(unsigned int *cpu, unsigned int *node, void *unused) >> { >> int cpu_id; > >It would ideally be nice to have a _bit_ more history on this about >how it became unused any why there is such high confidence that >userspace never tries to use it. > >Let's say someone comes along in a few years and wants to use this >'unused' parameter. Could they?
I believe it was a private storage area for the kernel to use... which it doesn't. Not doing anything at all with the pointer is perfectly legitimate.
