On Thu, 2020-05-07 at 12:33:24 UTC, Michael Ellerman wrote:
> The "m<>" constraint breaks compilation with GCC 4.6.x era compilers.
>
> The use of the constraint allows the compiler to use update-form
> instructions, however in practice current compilers never generate
> those forms for any of the current uses of __put_user_asm_goto().
>
> We anticipate that GCC 4.6 will be declared unsupported for building
> the kernel in the not too distant future. So for now just switch to
> the "m" constraint.
>
> Fixes: 334710b1496a ("powerpc/uaccess: Implement unsafe_put_user() using 'asm
> goto'")
> Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
Applied to powerpc topic/uaccess-ppc.
https://git.kernel.org/powerpc/c/e2a8b49e79553bd8ec48f73cead84e6146c09408
cheers
