Re: [PATCH v6 3/3] nptl: Use direct syscall numbers in setxid

[Szabolcs Nagy <szabolcs.nagy@arm.com>]

The 04/24/2023 23:17, Xi Ruoyao via Libc-alpha wrote:
> On Mon, 2023-04-24 at 11:03 -0400, Joe Simmons-Talbott via Libc-alpha
> wrote:
> > Make all internal glibc syscalls use direct compile time numeric values
> > rather than variables.  This will make the syscall number easier to
> > identify during static analysis.
> 
> This is making the code much more bloated and slower.  Do we really want
> to make everyone's system slower for some debug tools?

the switch statement overhead is many orders of magnitude smaller
than sending a signal to a thread and executing a syscall there
(which is where the switch statement happens).

i dont know if the change is justified, but from a target port
perspective it's useful if inline syscalls are guaranteed to use
a syscall name that can expand to an integer constant or named
function.