barrier_nospec() is a speculation barrier with arch dependent implementation. To be able to use barrier_nospec() in non-architecture code add a generic version that does nothing. Architectures that don't have a use case for speculation barrier shouldn't need to define an arch specific version.
Architectures needing speculation barrier can override the generic version in their asm/barrier.h.
Cc: stable@vger.kernel.org Signed-off-by: Pawan Gupta pawan.kumar.gupta@linux.intel.com --- include/linux/nospec.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/linux/nospec.h b/include/linux/nospec.h index c1e79f72cd89..60e040a5df27 100644 --- a/include/linux/nospec.h +++ b/include/linux/nospec.h @@ -60,6 +60,10 @@ static inline unsigned long array_index_mask_nospec(unsigned long index, (typeof(_i)) (_i & _mask); \ })
+#ifndef barrier_nospec +#define barrier_nospec() do { } while (0) +#endif + /* Speculation control prctl */ int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which); int arch_prctl_spec_ctrl_set(struct task_struct *task, unsigned long which,