aboutsummaryrefslogtreecommitdiff
path: root/arch/s390
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2013-01-17 08:56:30 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-01-17 08:56:30 -0800
commit72ffaa48e11fe40d96e70bd24289b5e2b8807297 (patch)
treef932739bc9c869a3acc037e2317ed2dd0baba664 /arch/s390
parentdfdebc24837ed0a1d6ad73b108a10d3c88d1b6e8 (diff)
parent509d97b6f91b51e180ba26ddb1e2b7f6dfa80cba (diff)
downloadvexpress-lsk-72ffaa48e11fe40d96e70bd24289b5e2b8807297.tar.gz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull more s390 patches from Martin Schwidefsky: "A couple of bug fixes: one of the transparent huge page primitives is broken, the sched_clock function overflows after 417 days, the XFS module has grown too large for -fpic and the new pci code has broken normal channel subsystem notifications." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/chsc: fix SEI usage s390/time: fix sched_clock() overflow s390: use -fPIC for module compile s390/mm: fix pmd_pfn() for thp
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/Makefile4
-rw-r--r--arch/s390/include/asm/pgtable.h5
-rw-r--r--arch/s390/include/asm/timex.h28
-rw-r--r--arch/s390/kernel/time.c2
-rw-r--r--arch/s390/kvm/interrupt.c2
5 files changed, 33 insertions, 8 deletions
diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index 4b8e08b56f4..7e3ce78d429 100644
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -24,8 +24,8 @@ CHECKFLAGS += -D__s390__ -msize-long
else
LD_BFD := elf64-s390
LDFLAGS := -m elf64_s390
-KBUILD_AFLAGS_MODULE += -fpic -D__PIC__
-KBUILD_CFLAGS_MODULE += -fpic -D__PIC__
+KBUILD_AFLAGS_MODULE += -fPIC
+KBUILD_CFLAGS_MODULE += -fPIC
KBUILD_CFLAGS += -m64
KBUILD_AFLAGS += -m64
UTS_MACHINE := s390x
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index c928dc1938f..c1d7930a82f 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1387,10 +1387,7 @@ static inline int has_transparent_hugepage(void)
static inline unsigned long pmd_pfn(pmd_t pmd)
{
- if (pmd_trans_huge(pmd))
- return pmd_val(pmd) >> HPAGE_SHIFT;
- else
- return pmd_val(pmd) >> PAGE_SHIFT;
+ return pmd_val(pmd) >> PAGE_SHIFT;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h
index fba4d66788a..4c060bb5b8e 100644
--- a/arch/s390/include/asm/timex.h
+++ b/arch/s390/include/asm/timex.h
@@ -128,4 +128,32 @@ static inline unsigned long long get_clock_monotonic(void)
return get_clock_xt() - sched_clock_base_cc;
}
+/**
+ * tod_to_ns - convert a TOD format value to nanoseconds
+ * @todval: to be converted TOD format value
+ * Returns: number of nanoseconds that correspond to the TOD format value
+ *
+ * Converting a 64 Bit TOD format value to nanoseconds means that the value
+ * must be divided by 4.096. In order to achieve that we multiply with 125
+ * and divide by 512:
+ *
+ * ns = (todval * 125) >> 9;
+ *
+ * In order to avoid an overflow with the multiplication we can rewrite this.
+ * With a split todval == 2^32 * th + tl (th upper 32 bits, tl lower 32 bits)
+ * we end up with
+ *
+ * ns = ((2^32 * th + tl) * 125 ) >> 9;
+ * -> ns = (2^23 * th * 125) + ((tl * 125) >> 9);
+ *
+ */
+static inline unsigned long long tod_to_ns(unsigned long long todval)
+{
+ unsigned long long ns;
+
+ ns = ((todval >> 32) << 23) * 125;
+ ns += ((todval & 0xffffffff) * 125) >> 9;
+ return ns;
+}
+
#endif
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index aff0e350d77..a5f4f5a1d24 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -63,7 +63,7 @@ static DEFINE_PER_CPU(struct clock_event_device, comparators);
*/
unsigned long long notrace __kprobes sched_clock(void)
{
- return (get_clock_monotonic() * 125) >> 9;
+ return tod_to_ns(get_clock_monotonic());
}
/*
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index c30615e605a..82c481ddef7 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -408,7 +408,7 @@ int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
return 0;
}
- sltime = ((vcpu->arch.sie_block->ckc - now)*125)>>9;
+ sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);