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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-10-12 13:24:45 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-10-19 17:07:36 +0200 |
| commit | ad3bc0ac1d2ed311ef3a9d6f2849948433a9f338 (patch) | |
| tree | c29158815f1d0b56a938528bbd9f07b1baff3a7f /arch/s390/kernel/machine_kexec.c | |
| parent | 00a8f886dbdaeea1d93543d5311ddf3a2680bf2b (diff) | |
| download | linux-ad3bc0ac1d2ed311ef3a9d6f2849948433a9f338.tar.gz | |
s390/ctl_reg: use decoding unions in update_cr_regs
Add a decoding union for the bits in control registers 2 and use
'union ctlreg0' and 'union ctlreg2' in update_cr_regs to improve
readability.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/machine_kexec.c')
| -rw-r--r-- | arch/s390/kernel/machine_kexec.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c index 51e8c63705a9ad..e94421678b13f8 100644 --- a/arch/s390/kernel/machine_kexec.c +++ b/arch/s390/kernel/machine_kexec.c @@ -105,7 +105,7 @@ static void __do_machine_kdump(void *image) static noinline void __machine_kdump(void *image) { struct mcesa *mcesa; - unsigned long cr2_old, cr2_new; + union ctlreg2 cr2_old, cr2_new; int this_cpu, cpu; lgr_info_log(); @@ -122,11 +122,12 @@ static noinline void __machine_kdump(void *image) if (MACHINE_HAS_VX) save_vx_regs((__vector128 *) mcesa->vector_save_area); if (MACHINE_HAS_GS) { - __ctl_store(cr2_old, 2, 2); - cr2_new = cr2_old | (1UL << 4); - __ctl_load(cr2_new, 2, 2); + __ctl_store(cr2_old.val, 2, 2); + cr2_new = cr2_old; + cr2_new.gse = 1; + __ctl_load(cr2_new.val, 2, 2); save_gs_cb((struct gs_cb *) mcesa->guarded_storage_save_area); - __ctl_load(cr2_old, 2, 2); + __ctl_load(cr2_old.val, 2, 2); } /* * To create a good backchain for this CPU in the dump store_status |