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Subject[PATCH 44/85] ACPICA: add preemption point after each opcode parse
From: Alexey Starikovskiy <astarikovskiy@suse.de>

Reference: http://marc.info/?l=linux-acpi&m=122236382701062&w=2

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
drivers/acpi/parser/psloop.c | 2 ++
include/acpi/acmacros.h | 5 +++++
include/acpi/platform/aclinux.h | 6 ++++++
3 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/parser/psloop.c b/drivers/acpi/parser/psloop.c
index c06238e..4647039 100644
--- a/drivers/acpi/parser/psloop.c
+++ b/drivers/acpi/parser/psloop.c
@@ -719,6 +719,8 @@ acpi_ps_complete_op(struct acpi_walk_state *walk_state,
*op = NULL;
}

+ ACPI_PREEMPTION_POINT();
+
return_ACPI_STATUS(AE_OK);
}

diff --git a/include/acpi/acmacros.h b/include/acpi/acmacros.h
index 57ab9e9..b402685 100644
--- a/include/acpi/acmacros.h
+++ b/include/acpi/acmacros.h
@@ -703,4 +703,9 @@ struct acpi_integer_overlay {

#endif /* ACPI_DBG_TRACK_ALLOCATIONS */

+/* Preemption point */
+#ifndef ACPI_PREEMPTION_POINT
+#define ACPI_PREEMPTION_POINT() /* no preemption */
+#endif
+
#endif /* ACMACROS_H */
diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
index 9af4645..029c8c0 100644
--- a/include/acpi/platform/aclinux.h
+++ b/include/acpi/platform/aclinux.h
@@ -53,6 +53,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ctype.h>
+#include <linux/sched.h>
#include <asm/system.h>
#include <asm/atomic.h>
#include <asm/div64.h>
@@ -137,4 +138,9 @@ static inline void *acpi_os_acquire_object(acpi_cache_t * cache)
#define ACPI_ALLOCATE_ZEROED(a) acpi_os_allocate_zeroed(a)
#define ACPI_FREE(a) kfree(a)

+/*
+ * We need to show where it is safe to preempt execution of ACPICA
+ */
+#define ACPI_PREEMPTION_POINT() cond_resched()
+
#endif /* __ACLINUX_H__ */
--
1.5.5.1


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