The nospec.h header expects the per-architecture header file asm/barrier.h to optionally define array_index_mask_nospec(). Include that dependency to prevent inadvertent fallback to the default array_index_mask_nospec() implementation. The default implementation may not provide a full mitigation on architectures that perform data value speculation.
Cc: Thomas Gleixner <t...@linutronix.de> Cc: Ingo Molnar <mi...@kernel.org> Cc: Will Deacon <will.dea...@arm.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Reported-by: Christian Borntraeger <borntrae...@de.ibm.com> Signed-off-by: Dan Williams <dan.j.willi...@intel.com> --- include/linux/nospec.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/nospec.h b/include/linux/nospec.h index 172a19dc35ab..e791ebc65c9c 100644 --- a/include/linux/nospec.h +++ b/include/linux/nospec.h @@ -5,6 +5,7 @@ #ifndef _LINUX_NOSPEC_H #define _LINUX_NOSPEC_H +#include <asm/barrier.h> /** * array_index_mask_nospec() - generate a ~0 mask when index < size, 0 otherwise
