On Wed, 2018-11-07 at 17:58 +0000, David Woodhouse wrote: > CAUTION: This email originated from outside of the organization. Do not click > links or open attachments unless you recognize the sender and know the > content is safe. > > > > On Wed, Nov 07, 2018 at 04:12:14PM -0000, David Woodhouse wrote: > > > > Yes, this may slow things down. I am not sure I agree with the impl. > > > > either. > > > > Could one not make cpu_to_je_X/jeX_to_cpu a function ptr which is set > > > to > > > > a func. with the correct endian? > > > > > > On x86 retpoline would make that quite slow.
retpoline aside, would it make a difference ? > > > > Is x86 the largest consumer of jffs2 ? > > Certainly not. I'm not sure which architectures do have Spectre V2 > mitigations which make indirect branches expensive now... perhaps there is > no intersection with the cases where we really care about JFFS2 being > CPU-bound? All that passing of a new extra arg and extra if .. elif .. does cost too.
