[PATCH 1/3] powerpc/uaccess: Switch __put_user_size_allowed() to __put_user_asm_goto()

[Andreas Schwab]

On Sep 04 2020, Christophe Leroy wrote:

> __put_user_asm_goto() provides more flexibility to GCC and avoids using
> a local variable to tell if the write succeeded or not.
> GCC can then avoid implementing a cmp in the fast path.

That breaks CLONE_CHILD_SETTID.  I'm getting an assertion failure in
__libc_fork (THREAD_GETMEM (self, tid) != ppid).

Andreas.

-- 
Andreas Schwab, schwab at linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."