Hi Heinrich,
On Thu, 2020-07-02 at 06:08 +0200, Heinrich Schuchardt wrote:
On 7/1/20 6:29 PM, Anastasiia Lukianenko wrote:
From: Oleksandr Andrushchenko oleksandr_andrushchenko@epam.com
Add wait_event_timeout - sleep until a condition gets true or a timeout elapses.
This is a stripped version of the same from Linux kernel with the following u-boot specific modifications:
- no wait queues supported
- use u-boot timer to detect timeouts
- check for Ctrl-C pressed during wait
Signed-off-by: Oleksandr Andrushchenko < oleksandr_andrushchenko@epam.com> Signed-off-by: Anastasiia Lukianenko < anastasiia_lukianenko@epam.com>
include/linux/compat.h | 45 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+)
diff --git a/include/linux/compat.h b/include/linux/compat.h index 712eeaef4e..5375b7d3b8 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -1,12 +1,20 @@ #ifndef _LINUX_COMPAT_H_ #define _LINUX_COMPAT_H_
+#include <console.h> #include <log.h> #include <malloc.h>
+#include <asm/processor.h>
#include <linux/types.h> #include <linux/err.h> #include <linux/kernel.h>
+#ifdef CONFIG_XEN +#include <xen/events.h> +#endif
struct unused {}; typedef struct unused unused_t;
@@ -122,6 +130,43 @@ static inline void kmem_cache_destroy(struct kmem_cache *cachep) #define add_wait_queue(...) do { } while (0) #define remove_wait_queue(...) do { } while (0)
+#ifndef CONFIG_XEN +#define eventchn_poll() +#endif
+#define __wait_event_timeout(condition, timeout, ret) \ +({ \
- ulong __ret = ret; /* explicit shadow */ \
- ulong start = get_timer(0); \
- for (;;) { \
eventchn_poll(); \if (condition) { \__ret = 1; \break; \- } \
- if ((get_timer(start) > timeout) || ctrlc()) { \
__ret = 0; \break; \- } \
- cpu_relax(); \
- } \
- __ret; \
+})
+/*
- 0 if the @condition evaluated to %false after the @timeout
elapsed,
- 1 if the @condition evaluated to %true
- */
Please, document all arguments. Use Sphinx style as in
https://urldefense.com/v3/__https://www.kernel.org/doc/html/latest/doc-guide...
.
Ok, I will fix it in the next version.
Best regards
Heinrich.
Best regards, Anastasiia
+#define wait_event_timeout(wq_head, condition, timeout) \ +({ \
- ulong __ret;
\
- if (condition)
\
__ret = 1; \- else
\
__ret = __wait_event_timeout(condition, timeout,__ret);\
- __ret;
\ +})
#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
/* This is also defined in ARMv8's mmu.h */