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Update code to use misc_register()/misc_deregister()

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When the SPL was originally written it was designed to use the
device_create() and device_destroy() functions.  Unfortunately,
these functions changed considerably over the years making them
difficult to rely on.

As it turns out a better choice would have been to use the
misc_register()/misc_deregister() functions.  This interface
for registering character devices has remained stable, is simple,
and provides everything we need.

Therefore the code has been reworked to use this interface.  The
higher level ZFS code has always depended on these same interfaces
so this is also as a step towards minimizing our kernel dependencies.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf
2014-09-29 19:42:15 -04:00
parent 0cb3dafccd
commit 3a92530563
7 changed files with 21 additions and 225 deletions
Download Patch File Download Diff File Expand all files Collapse all files
config/spl-build.m4
-61
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@@ -34,9 +34,6 @@ AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
SPL_AC_VMALLOC_INFO
SPL_AC_PDE_DATA
SPL_AC_FLS64
SPL_AC_DEVICE_CREATE
SPL_AC_5ARGS_DEVICE_CREATE
SPL_AC_CLASS_DEVICE_CREATE
SPL_AC_SET_NORMALIZED_TIMESPEC_EXPORT
SPL_AC_SET_NORMALIZED_TIMESPEC_INLINE
SPL_AC_TIMESPEC_SUB
@@ -1075,64 +1072,6 @@ AC_DEFUN([SPL_AC_FLS64],
])
])
dnl #
dnl # 2.6.18 API change, check whether device_create() is available.
dnl # Device_create() was introduced in 2.6.18 and depricated
dnl # class_device_create() which was fully removed in 2.6.26.
dnl #
AC_DEFUN([SPL_AC_DEVICE_CREATE],
[AC_MSG_CHECKING([whether device_create() is available])
SPL_CHECK_SYMBOL_EXPORT([device_create], [drivers/base/core.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_DEVICE_CREATE, 1,
[device_create() is available])
], [
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.27 API change,
dnl # device_create() uses 5 args, new 'drvdata' argument.
dnl #
AC_DEFUN([SPL_AC_5ARGS_DEVICE_CREATE], [
AC_MSG_CHECKING([whether device_create() wants 5 args])
tmp_flags="$EXTRA_KCFLAGS"
EXTRA_KCFLAGS="-Werror"
SPL_LINUX_TRY_COMPILE([
#include <linux/device.h>
],[
device_create(NULL, NULL, 0, NULL, "%d", 1);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_5ARGS_DEVICE_CREATE, 1,
[device_create wants 5 args])
],[
AC_MSG_RESULT(no)
])
EXTRA_KCFLAGS="$tmp_flags"
])
dnl #
dnl # 2.6.13 API change, check whether class_device_create() is available.
dnl # Class_device_create() was introduced in 2.6.13 and depricated
dnl # class_simple_device_add() which was fully removed in 2.6.13.
dnl #
AC_DEFUN([SPL_AC_CLASS_DEVICE_CREATE],
[AC_MSG_CHECKING([whether class_device_create() is available])
SPL_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/device.h>
], [
class_device_create(NULL, NULL, 0, NULL, NULL);
], [class_device_create], [drivers/base/class.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_CLASS_DEVICE_CREATE, 1,
[class_device_create() is available])
], [
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 2.6.26 API change, set_normalized_timespec() is exported.
dnl #