On Wed, Nov 29, 2017 at 01:31:58PM +0100, Peter Zijlstra wrote: > On Wed, Nov 29, 2017 at 11:33:05AM +0100, Peter Zijlstra wrote: > > @@ -220,7 +215,27 @@ For 32-bit we have the following convent > > .macro SWITCH_TO_USER_CR3 scratch_reg:req > > STATIC_JUMP_IF_FALSE .Lend_\@, kaiser_enabled_key, def=1 > > mov %cr3, \scratch_reg > > - ADJUST_USER_CR3 \scratch_reg > > + > > + /* > > + * Test if the ASID needs a flush. > > + */ > > + push \scratch_reg /* preserve CR3 */ > > So I was just staring at disasm of a few functions and I noticed this > one reads like push, while others read like pushq. > > So does the stupid assembler thing really do a 32bit push if you provide > it with a 64bit register?
N/m, I just really cannot read straight today. The pushq's were a mem64, not a r64 argument to push.
