On Mon, Nov 27, 2017 at 11:31:11PM +0100, Peter Zijlstra wrote: > Change the asm to do the CR3 switcheroo so we can remove the magic > mappings. > > Since RDI is unused after SWAPGS we can use it as a scratch reg for > SWITCH_TO_KERNEL. And once we've computed the new RSP (in RAX) we no > longer need RDI and can again use it as scratch reg for > SWITCH_TO_USER. Forgot to note; this passes tools/testing/selftests/x86/sigreturn_64. > Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
