[PATCH] Linux: Inhibit tail calls in cancellable system calls

[Carlos O'Donell]

On 3/21/25 9:01 AM, Florian Weimer wrote:
> Without this change, the system call wrapper function is not visible
> on the stack at the time of the system call, which causes problems
> for interception tools such as valgrind.
> 
> Enhances commit 89b53077d2a58f00e7debdfe58afabe953dac60d ("nptl: Fix
> Race conditions in pthread cancellation [BZ#12683]").
> 
> Tested on i686-linux-gnu, powerpc64le-linux-gnu, x86_64-linux-gnu.
> (We're still discussing if valgrind needs this, but if it does, here's a
> patch.)

We discussed this on the weekly patch queue review.

Glad to see the Valgrind discussion is ongoing.

This has cross-architecture implications, and can add extra function calls.

I'm marking the patch in patchwork as changes requested since we should review
and discuss Adhemerval's suggestion.

-- 
Cheers,
Carlos.