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authorIngo Molnar <mingo@elte.hu>2006-02-14 13:53:15 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-14 16:09:35 -0800
commit06027bdd278a32a84b273e41db68a5db8ffd2bb6 (patch)
treed22c98848c3964104fc5c617da60c14af5b4a1f0
parente35a6619e7be59aa38249346327c89207663bb37 (diff)
downloadlinux-2.6.34-ux500-06027bdd278a32a84b273e41db68a5db8ffd2bb6.tar.gz
[PATCH] hrtimer: round up relative start time on low-res arches
CONFIG_TIME_LOW_RES is a temporary way for architectures to signal that they simply return xtime in do_gettimeoffset(). In this corner-case we want to round up by resolution when starting a relative timer, to avoid short timeouts. This will go away with the GTOD framework. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/frv/Kconfig4
-rw-r--r--arch/h8300/Kconfig4
-rw-r--r--arch/m68k/Kconfig4
-rw-r--r--arch/m68knommu/Kconfig4
-rw-r--r--arch/parisc/Kconfig5
-rw-r--r--arch/v850/Kconfig4
-rw-r--r--kernel/hrtimer.c13
7 files changed, 37 insertions, 1 deletions
diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
index 60a617aff8b..e0838371237 100644
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig
@@ -25,6 +25,10 @@ config GENERIC_HARDIRQS
bool
default n
+config TIME_LOW_RES
+ bool
+ default y
+
mainmenu "Fujitsu FR-V Kernel Configuration"
source "init/Kconfig"
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 80940d712ac..98308b018a3 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -33,6 +33,10 @@ config GENERIC_CALIBRATE_DELAY
bool
default y
+config TIME_LOW_RES
+ bool
+ default y
+
config ISA
bool
default y
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 96b91982805..8849439e88d 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -21,6 +21,10 @@ config GENERIC_CALIBRATE_DELAY
bool
default y
+config TIME_LOW_RES
+ bool
+ default y
+
config ARCH_MAY_HAVE_PC_FDC
bool
depends on Q40 || (BROKEN && SUN3X)
diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index e2a6e864896..e50858dbc23 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -29,6 +29,10 @@ config GENERIC_CALIBRATE_DELAY
bool
default y
+config TIME_LOW_RES
+ bool
+ default y
+
source "init/Kconfig"
menu "Processor type and features"
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 7c914a4c67c..eca33cfa8a4 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -29,6 +29,11 @@ config GENERIC_CALIBRATE_DELAY
bool
default y
+config TIME_LOW_RES
+ bool
+ depends on SMP
+ default y
+
config GENERIC_ISA_DMA
bool
diff --git a/arch/v850/Kconfig b/arch/v850/Kconfig
index 04494638b96..e7fc3e50034 100644
--- a/arch/v850/Kconfig
+++ b/arch/v850/Kconfig
@@ -28,6 +28,10 @@ config GENERIC_IRQ_PROBE
bool
default y
+config TIME_LOW_RES
+ bool
+ default y
+
# Turn off some random 386 crap that can affect device config
config ISA
bool
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 2b6e1757aed..5ae51f1bc7c 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -418,8 +418,19 @@ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
/* Switch the timer base, if necessary: */
new_base = switch_hrtimer_base(timer, base);
- if (mode == HRTIMER_REL)
+ if (mode == HRTIMER_REL) {
tim = ktime_add(tim, new_base->get_time());
+ /*
+ * CONFIG_TIME_LOW_RES is a temporary way for architectures
+ * to signal that they simply return xtime in
+ * do_gettimeoffset(). In this case we want to round up by
+ * resolution when starting a relative timer, to avoid short
+ * timeouts. This will go away with the GTOD framework.
+ */
+#ifdef CONFIG_TIME_LOW_RES
+ tim = ktime_add(tim, base->resolution);
+#endif
+ }
timer->expires = tim;
enqueue_hrtimer(timer, new_base);