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| author | Andi Kleen <ak@linux.intel.com> | 2010-09-08 18:54:17 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 21:16:43 +0400 |
| commit | e52eec13cd6b7f30ab19081b387813e03e592ae5 (patch) | |
| tree | 7b327e0b9283c578fb10922edcf6e10b3b8fd943 /include/linux/device.h | |
| parent | 39aba963d937edb20db7d9d93e6dda5d2adfdcdd (diff) | |
| download | linux-e52eec13cd6b7f30ab19081b387813e03e592ae5.tar.xz | |
SYSFS: Allow boot time switching between deprecated and modern sysfs layout
I have some systems which need legacy sysfs due to old tools that are
making assumptions that a directory can never be a symlink to another
directory, and it's a big hazzle to compile separate kernels for them.
This patch turns CONFIG_SYSFS_DEPRECATED into a run time option
that can be switched on/off the kernel command line. This way
the same binary can be used in both cases with just a option
on the command line.
The old CONFIG_SYSFS_DEPRECATED_V2 option is still there to set
the default. I kept the weird name to not break existing
config files.
Also the compat code can be still completely disabled by undefining
CONFIG_SYSFS_DEPRECATED_SWITCH -- just the optimizer takes
care of this now instead of lots of ifdefs. This makes the code
look nicer.
v2: This is an updated version on top of Kay's patch to only
handle the block devices. I tested it on my old systems
and that seems to work.
Cc: axboe@kernel.dk
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/device.h')
| -rw-r--r-- | include/linux/device.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/device.h b/include/linux/device.h index 516fecacf27b..dd4895313468 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -751,4 +751,11 @@ do { \ MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor)) #define MODULE_ALIAS_CHARDEV_MAJOR(major) \ MODULE_ALIAS("char-major-" __stringify(major) "-*") + +#ifdef CONFIG_SYSFS_DEPRECATED +extern long sysfs_deprecated; +#else +#define sysfs_deprecated 0 +#endif + #endif /* _DEVICE_H_ */ |