Date: Sat, 8 Jun 2019 16:03:34 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r348802 - head/sys/amd64/amd64 Message-ID: <201906081603.x58G3YRm093881@repo.freebsd.org>
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Author: kib Date: Sat Jun 8 16:03:34 2019 New Revision: 348802 URL: https://svnweb.freebsd.org/changeset/base/348802 Log: Remove lazy FPU switch support from amd64. It is incompatible with some future features. Sponsored by: The FreeBSD Foundation MFC after: 1 week Modified: head/sys/amd64/amd64/fpu.c Modified: head/sys/amd64/amd64/fpu.c ============================================================================== --- head/sys/amd64/amd64/fpu.c Sat Jun 8 15:24:03 2019 (r348801) +++ head/sys/amd64/amd64/fpu.c Sat Jun 8 16:03:34 2019 (r348802) @@ -154,11 +154,6 @@ static void fpu_clean_state(void); SYSCTL_INT(_hw, HW_FLOATINGPT, floatingpoint, CTLFLAG_RD, SYSCTL_NULL_INT_PTR, 1, "Floating point instructions executed in hardware"); -int lazy_fpu_switch = 0; -SYSCTL_INT(_hw, OID_AUTO, lazy_fpu_switch, CTLFLAG_RWTUN | CTLFLAG_NOFETCH, - &lazy_fpu_switch, 0, - "Lazily load FPU context after context switch"); - int use_xsave; /* non-static for cpu_switch.S */ uint64_t xsave_mask; /* the same */ static uma_zone_t fpu_save_area_zone; @@ -269,7 +264,6 @@ fpuinit_bsp1(void) uint64_t xsave_mask_user; bool old_wp; - TUNABLE_INT_FETCH("hw.lazy_fpu_switch", &lazy_fpu_switch); if (!use_xsave) return; cpuid_count(0xd, 0x0, cp); @@ -774,8 +768,7 @@ void fpu_activate_sw(struct thread *td) { - if (lazy_fpu_switch || (td->td_pflags & TDP_KTHREAD) != 0 || - !PCB_USER_FPU(td->td_pcb)) { + if ((td->td_pflags & TDP_KTHREAD) != 0 || !PCB_USER_FPU(td->td_pcb)) { PCPU_SET(fpcurthread, NULL); start_emulating(); } else if (PCPU_GET(fpcurthread) != td) {
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