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From a07804cc7472d8aa5db03ea5d75f3d8d80abb687 Mon Sep 17 00:00:00 2001
From: Baolin Wang <baolin.wang@linaro.org>
Date: Tue, 24 Apr 2018 20:06:09 +0800
Subject: [PATCH] ALSA: Avoid using timespec for struct snd_timer_status
struct snd_timer_status uses 'timespec' type variables to record
timestamp, which will be changed to an incompatible layout with
updated user space using 64-bit time_t.
To handle both the old and the new layout on 32-bit architectures,
this patch introduces 'struct snd_timer_status32' and 'struct snd_timer_status64'
to handle 32bit time_t and 64bit time_t in native mode and compat mode,
which replaces timespec with s64 type.
When glibc changes time_t to 64-bit, any recompiled program will issue
ioctl commands that the kernel does not understand without this patch.
In the public uapi header, snd_timer_status is now guarded by
an #ifndef __KERNEL__ to avoid referencing 'struct timespec'.
The timespec definition will be removed from the kernel to prevent
new y2038 bugs and to avoid the conflict with an incompatible libc
type of the same name.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
include/uapi/sound/asound.h | 2 ++
--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -761,6 +761,7 @@ struct snd_timer_params {
unsigned char reserved[60]; /* reserved */
};
+#ifndef __KERNEL__
struct snd_timer_status {
struct timespec tstamp; /* Timestamp - last update */
unsigned int resolution; /* current period resolution in ns */
@@ -769,6 +770,7 @@ struct snd_timer_status {
unsigned int queue; /* used queue size */
unsigned char reserved[64]; /* reserved */
};
+#endif
#define SNDRV_TIMER_IOCTL_PVERSION _IOR('T', 0x00, int)
#define SNDRV_TIMER_IOCTL_NEXT_DEVICE _IOWR('T', 0x01, struct snd_timer_id)
--
2.26.2
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