Pull virt-cpu-accounting into release branch

[linux-2.6-omap-h63xx.git] / arch / ia64 / kernel / fsys.S

diff --git a/arch/ia64/kernel/fsys.S b/arch/ia64/kernel/fsys.S
index c932d86e2d81fb13f4415fd21700a8bbc7bb1632..357b7e2adc63b52901f3cfe34dbe40d1c79057c4 100644 (file)
--- a/arch/ia64/kernel/fsys.S
+++ b/arch/ia64/kernel/fsys.S
@@ -210,27 +210,25 @@ ENTRY(fsys_gettimeofday)
        // Note that instructions are optimized for McKinley. McKinley can
        // process two bundles simultaneously and therefore we continuously
        // try to feed the CPU two bundles and then a stop.
-       //
-       // Additional note that code has changed a lot. Optimization is TBD.
-       // Comments begin with "?" are maybe outdated.
-       tnat.nz p6,p0 = r31     // ? branch deferred to fit later bundle
-       mov pr = r30,0xc000     // Set predicates according to function
+
        add r2 = TI_FLAGS+IA64_TASK_SIZE,r16
+       tnat.nz p6,p0 = r31             // guard against Nat argument
+(p6)   br.cond.spnt.few .fail_einval
        movl r20 = fsyscall_gtod_data // load fsyscall gettimeofday data address
        ;;
+       ld4 r2 = [r2]                   // process work pending flags
        movl r29 = itc_jitter_data      // itc_jitter
        add r22 = IA64_GTOD_WALL_TIME_OFFSET,r20        // wall_time
-       ld4 r2 = [r2]           // process work pending flags
-       ;;
-(p15)  add r22 = IA64_GTOD_MONO_TIME_OFFSET,r20        // monotonic_time
        add r21 = IA64_CLKSRC_MMIO_OFFSET,r20
-       add r19 = IA64_ITC_LASTCYCLE_OFFSET,r29
+       mov pr = r30,0xc000     // Set predicates according to function
+       ;;
        and r2 = TIF_ALLWORK_MASK,r2
-(p6)    br.cond.spnt.few .fail_einval  // ? deferred branch
+       add r19 = IA64_ITC_LASTCYCLE_OFFSET,r29
+(p15)  add r22 = IA64_GTOD_MONO_TIME_OFFSET,r20        // monotonic_time
        ;;
-       add r26 = IA64_CLKSRC_CYCLE_LAST_OFFSET,r20 // clksrc_cycle_last
+       add r26 = IA64_CLKSRC_CYCLE_LAST_OFFSET,r20     // clksrc_cycle_last
        cmp.ne p6, p0 = 0, r2   // Fallback if work is scheduled
-(p6)    br.cond.spnt.many fsys_fallback_syscall
+(p6)   br.cond.spnt.many fsys_fallback_syscall
        ;;
        // Begin critical section
 .time_redo:
@@ -258,7 +256,6 @@ ENTRY(fsys_gettimeofday)
 (p8)   mov r2 = ar.itc         // CPU_TIMER. 36 clocks latency!!!
 (p9)   ld8 r2 = [r30]          // MMIO_TIMER. Could also have latency issues..
 (p13)  ld8 r25 = [r19]         // get itc_lastcycle value
-       ;;              // ? could be removed by moving the last add upward
        ld8 r9 = [r22],IA64_TIMESPEC_TV_NSEC_OFFSET     // tv_sec
        ;;
        ld8 r8 = [r22],-IA64_TIMESPEC_TV_NSEC_OFFSET    // tv_nsec
@@ -285,13 +282,12 @@ ENTRY(fsys_gettimeofday)
 EX(.fail_efault, probe.w.fault r31, 3)
        xmpy.l f8 = f8,f7       // nsec_per_cyc*(counter-last_counter)
        ;;
-       // ? simulate tbit.nz.or p7,p0 = r28,0
        getf.sig r2 = f8
        mf
        ;;
        ld4 r10 = [r20]         // gtod_lock.sequence
        shr.u r2 = r2,r23       // shift by factor
-       ;;              // ? overloaded 3 bundles!
+       ;;
        add r8 = r8,r2          // Add xtime.nsecs
        cmp4.ne p7,p0 = r28,r10
 (p7)   br.cond.dpnt.few .time_redo     // sequence number changed, redo
@@ -319,9 +315,9 @@ EX(.fail_efault, probe.w.fault r31, 3)
 EX(.fail_efault, probe.w.fault r23, 3) // This also costs 5 cycles
 (p14)  xmpy.hu f8 = f8, f7             // xmpy has 5 cycles latency so use it
        ;;
-       mov r8 = r0
 (p14)  getf.sig r2 = f8
        ;;
+       mov r8 = r0
 (p14)  shr.u r21 = r2, 4
        ;;
 EX(.fail_efault, st8 [r31] = r9)