Re: [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.

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