diff --git a/arch/s390/kernel/sysinfo.c b/arch/s390/kernel/sysinfo.c index f7dba3887a54..96d81502e599 100644 --- a/arch/s390/kernel/sysinfo.c +++ b/arch/s390/kernel/sysinfo.c @@ -16,11 +16,7 @@ #include #include #include - -/* Sigh, math-emu. Don't ask. */ -#include -#include -#include +#include int topology_max_mnest; @@ -414,10 +410,8 @@ subsys_initcall(create_proc_service_level); void s390_adjust_jiffies(void) { struct sysinfo_1_2_2 *info; - const unsigned int fmil = 0x4b189680; /* 1e7 as 32-bit float. */ - FP_DECL_S(SA); FP_DECL_S(SB); FP_DECL_S(SR); - FP_DECL_EX; - unsigned int capability; + unsigned long capability; + struct kernel_fpu fpu; info = (void *) get_zeroed_page(GFP_KERNEL); if (!info) @@ -433,15 +427,25 @@ void s390_adjust_jiffies(void) * higher cpu capacity. Bogomips are the other way round. * To get to a halfway suitable number we divide 1e7 * by the cpu capability number. Yes, that means a floating - * point division .. math-emu here we come :-) + * point division .. */ - FP_UNPACK_SP(SA, &fmil); - if ((info->capability >> 23) == 0) - FP_FROM_INT_S(SB, (long) info->capability, 64, long); - else - FP_UNPACK_SP(SB, &info->capability); - FP_DIV_S(SR, SA, SB); - FP_TO_INT_S(capability, SR, 32, 0); + kernel_fpu_begin(&fpu, KERNEL_FPR); + asm volatile( + " sfpc %3\n" + " l %0,%1\n" + " tmlh %0,0xff80\n" + " jnz 0f\n" + " cefbr %%f2,%0\n" + " j 1f\n" + "0: le %%f2,%1\n" + "1: cefbr %%f0,%2\n" + " debr %%f0,%%f2\n" + " cgebr %0,5,%%f0\n" + : "=&d" (capability) + : "Q" (info->capability), "d" (10000000), "d" (0) + : "cc" + ); + kernel_fpu_end(&fpu); } else /* * Really old machine without stsi block for basic