[S390] cpu hotplug and accounting values

Reset the cpu timer to the maximum value and correctly initialize the
cpu accounting values in the lowcore when the cpu is started.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index 67a60016babbc628afe7c7d980114d85c21068f5..fa9905ce7d0b088bb5e0c1143d30bce03038af75 100644 (file)
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -27,6 +27,8 @@ int main(void)
        DEFINE(__TI_flags, offsetof(struct thread_info, flags));
        DEFINE(__TI_cpu, offsetof(struct thread_info, cpu));
        DEFINE(__TI_precount, offsetof(struct thread_info, preempt_count));
+       DEFINE(__TI_user_timer, offsetof(struct thread_info, user_timer));
+       DEFINE(__TI_system_timer, offsetof(struct thread_info, system_timer));
        BLANK();
        DEFINE(__PT_ARGS, offsetof(struct pt_regs, args));
        DEFINE(__PT_PSW, offsetof(struct pt_regs, psw));

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 1268aa2991bfb34eac601236e6515ea9719bfa4b..f3e2759342135c170b5b70e9f75375f9a62efdea 100644 (file)
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -837,16 +837,29 @@ mcck_return:
        __CPUINIT
        .globl restart_int_handler
 restart_int_handler:
+       basr    %r1,0
+restart_base:
+       spt     restart_vtime-restart_base(%r1)
+       stck    __LC_LAST_UPDATE_CLOCK
+       mvc     __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1)
+       mvc     __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1)
        l       %r15,__LC_SAVE_AREA+60  # load ksp
        lctl    %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs
        lam     %a0,%a15,__LC_AREGS_SAVE_AREA
        lm      %r6,%r15,__SF_GPRS(%r15) # load registers from clone
+       l       %r1,__LC_THREAD_INFO
+       mvc     __LC_USER_TIMER(8),__TI_user_timer(%r1)
+       mvc     __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1)
+       xc      __LC_STEAL_TIMER(8),__LC_STEAL_TIMER
        stosm   __SF_EMPTY(%r15),0x04   # now we can turn dat on
        basr    %r14,0
        l       %r14,restart_addr-.(%r14)
        br      %r14                    # branch to start_secondary
 restart_addr:
        .long   start_secondary
+       .align  8
+restart_vtime:
+       .long   0x7fffffff,0xffffffff
        .previous
 #else
 /*

diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index c6fbde13971a5180ec1b2d33a845f031b0cccbeb..84a105838e03d2765723a3b995d00133e434ea11 100644 (file)
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -831,14 +831,27 @@ mcck_return:
        __CPUINIT
        .globl restart_int_handler
 restart_int_handler:
+       basr    %r1,0
+restart_base:
+       spt     restart_vtime-restart_base(%r1)
+       stck    __LC_LAST_UPDATE_CLOCK
+       mvc     __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1)
+       mvc     __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1)
        lg      %r15,__LC_SAVE_AREA+120 # load ksp
        lghi    %r10,__LC_CREGS_SAVE_AREA
        lctlg   %c0,%c15,0(%r10) # get new ctl regs
        lghi    %r10,__LC_AREGS_SAVE_AREA
        lam     %a0,%a15,0(%r10)
        lmg     %r6,%r15,__SF_GPRS(%r15) # load registers from clone
+       lg      %r1,__LC_THREAD_INFO
+       mvc     __LC_USER_TIMER(8),__TI_user_timer(%r1)
+       mvc     __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1)
+       xc      __LC_STEAL_TIMER(8),__LC_STEAL_TIMER
        stosm   __SF_EMPTY(%r15),0x04   # now we can turn dat on
        jg      start_secondary
+       .align  8
+restart_vtime:
+       .long   0x7fffffff,0xffffffff
        .previous
 #else
 /*