| Message ID | a29745ae921ed03084b7d4bdec38c7b01d764fb9.1666651511.git.pawan.kumar.gupta@linux.intel.com (mailing list archive) |
|---|---|
| State | RFC |
| Headers | show |
| Series | Branch Target Injection (BTI) gadget in minstrel | expand |
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,
barrier_nospec() is a speculation barrier with an arch dependent implementation. Architectures that don't need a speculation barrier shouldn't have to define an arch specific version. To be able to use barrier_nospec() in non-architecture code add a generic version that does nothing. Architectures needing speculation barrier can override the generic version in their asm/barrier.h. Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> --- include/linux/nospec.h | 4 ++++ 1 file changed, 4 insertions(+)