tree: https://github.com/weiny2/linux-kernel.git tip-pks-v4.10-5.12-rc head: 74e4f6716199c0b1af6e647582a6b83c4a38cd2d commit: fdc7d4ec8c2b4ad63e037502fd15407c204a1642 [9/17] x86/entry: Preserve PKRS MSR across exceptions config: x86_64-rhel-7.6-kselftests (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/weiny2/linux-kernel/commit/fdc7d4ec8c2b4ad63e037502fd1... git remote add weiny2 https://github.com/weiny2/linux-kernel.git git fetch --no-tags weiny2 tip-pks-v4.10-5.12-rc git checkout fdc7d4ec8c2b4ad63e037502fd15407c204a1642 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/x86/entry/common.c:200:24: warning: no previous prototype for 'do_SYSENTER_32' [-Wmissing-prototypes] 200 | __visible noinstr long do_SYSENTER_32(struct pt_regs *regs) | ^~~~~~~~~~~~~~ arch/x86/entry/common.c:318:24: warning: no previous prototype for 'xen_pv_evtchn_do_upcall' [-Wmissing-prototypes] 318 | __visible noinstr void xen_pv_evtchn_do_upcall(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~~~~~ arch/x86/entry/common.c: In function 'xen_pv_evtchn_do_upcall': 328 | pkrs_restore_irq(regs); | ^~~~~~~~~~~~~~~~ | xa_store_irq cc1: some warnings being treated as errors vim +328 arch/x86/entry/common.c 317 318 __visible noinstr void xen_pv_evtchn_do_upcall(struct pt_regs *regs) 319 { 320 irqentry_state_t state = irqentry_enter(regs); 321 bool inhcall; 322 323 run_sysvec_on_irqstack_cond(__xen_pv_evtchn_do_upcall, regs); 324 325 inhcall = get_and_clear_inhcall(); 326 if (inhcall && !WARN_ON_ONCE(state.exit_rcu)) { 327 /* Normally called by irqentry_exit, we must restore pkrs here */ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org