commit 8d736482

 upstream.

In a NOMMU kernel, sigreturn trampolines are generated on the user
stack by setup_rt_frame. Currently, these trampolines are not instruction
fenced, thus their visibility to ifetch is not guaranteed.

This patch adds a flush_icache_range in setup_rt_frame to fix this
problem.

Signed-off-by: Mathis Salmen <[email protected]>
Fixes: 6bd33e1e ("riscv: add nommu support")
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]


Signed-off-by: Palmer Dabbelt <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>