Date: Sat, 21 Jul 2012 13:47:37 +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: r238670 - head/sys/amd64/amd64 Message-ID: <201207211347.q6LDlbBr040173@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: kib Date: Sat Jul 21 13:47:37 2012 New Revision: 238670 URL: http://svn.freebsd.org/changeset/base/238670 Log: Stop caching curpcb in the local variable. Requested by: bde 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 Jul 21 13:06:37 2012 (r238669) +++ head/sys/amd64/amd64/fpu.c Sat Jul 21 13:47:37 2012 (r238670) @@ -582,7 +582,6 @@ static int err_count = 0; void fpudna(void) { - struct pcb *pcb; critical_enter(); if (PCPU_GET(fpcurthread) == curthread) { @@ -604,11 +603,10 @@ fpudna(void) * Record new context early in case frstor causes a trap. */ PCPU_SET(fpcurthread, curthread); - pcb = curpcb; fpu_clean_state(); - if ((pcb->pcb_flags & PCB_FPUINITDONE) == 0) { + if ((curpcb->pcb_flags & PCB_FPUINITDONE) == 0) { /* * This is the first time this thread has used the FPU or * the PCB doesn't contain a clean FPU state. Explicitly @@ -619,17 +617,17 @@ fpudna(void) * fpu_initialstate, to ignite the XSAVEOPT * tracking engine. */ - bcopy(fpu_initialstate, pcb->pcb_save, cpu_max_ext_state_size); - fpurestore(pcb->pcb_save); - if (pcb->pcb_initial_fpucw != __INITIAL_FPUCW__) - fldcw(pcb->pcb_initial_fpucw); - if (PCB_USER_FPU(pcb)) - set_pcb_flags(pcb, + bcopy(fpu_initialstate, curpcb->pcb_save, cpu_max_ext_state_size); + fpurestore(curpcb->pcb_save); + if (curpcb->pcb_initial_fpucw != __INITIAL_FPUCW__) + fldcw(curpcb->pcb_initial_fpucw); + if (PCB_USER_FPU(curpcb)) + set_pcb_flags(curpcb, PCB_FPUINITDONE | PCB_USERFPUINITDONE); else - set_pcb_flags(pcb, PCB_FPUINITDONE); + set_pcb_flags(curpcb, PCB_FPUINITDONE); } else - fpurestore(pcb->pcb_save); + fpurestore(curpcb->pcb_save); critical_exit(); } @@ -963,16 +961,14 @@ fpu_kern_leave(struct thread *td, struct int fpu_kern_thread(u_int flags) { - struct pcb *pcb; - pcb = curpcb; KASSERT((curthread->td_pflags & TDP_KTHREAD) != 0, ("Only kthread may use fpu_kern_thread")); - KASSERT(pcb->pcb_save == get_pcb_user_save_pcb(pcb), + KASSERT(curpcb->pcb_save == get_pcb_user_save_pcb(curpcb), ("mangled pcb_save")); - KASSERT(PCB_USER_FPU(pcb), ("recursive call")); + KASSERT(PCB_USER_FPU(curpcb), ("recursive call")); - set_pcb_flags(pcb, PCB_KERNFPU); + set_pcb_flags(curpcb, PCB_KERNFPU); return (0); }
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201207211347.q6LDlbBr040173>