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| author | Thomas Weißschuh <linux@weissschuh.net> | 2022-12-21 16:17:52 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-20 14:30:45 +0100 |
| commit | 00142bfd5a916a0b3899cc709bf8f5042cf3d084 (patch) | |
| tree | 461d76a47c3a81156d5d6a8c9bfc94c5d1350243 /kernel/ksysfs.c | |
| parent | e5da06b27ff5a148e42265c8e306670a9d913969 (diff) | |
| download | linux-00142bfd5a916a0b3899cc709bf8f5042cf3d084.tar.gz linux-00142bfd5a916a0b3899cc709bf8f5042cf3d084.tar.bz2 linux-00142bfd5a916a0b3899cc709bf8f5042cf3d084.zip | |
kernels/ksysfs.c: export kernel address bits
This can be used by userspace to determine the address size of the
running kernel.
It frees userspace from having to interpret this information from the
UTS machine field.
Userspace implementation:
https://github.com/util-linux/util-linux/pull/1966
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20221221-address-bits-v1-1-8446b13244ac@weissschuh.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/ksysfs.c')
| -rw-r--r-- | kernel/ksysfs.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c index 2df00b789b90..0408aab80941 100644 --- a/kernel/ksysfs.c +++ b/kernel/ksysfs.c @@ -51,6 +51,14 @@ static ssize_t cpu_byteorder_show(struct kobject *kobj, } KERNEL_ATTR_RO(cpu_byteorder); +/* address bits */ +static ssize_t address_bits_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%zu\n", sizeof(void *) * 8 /* CHAR_BIT */); +} +KERNEL_ATTR_RO(address_bits); + #ifdef CONFIG_UEVENT_HELPER /* uevent helper program, used during early boot */ static ssize_t uevent_helper_show(struct kobject *kobj, @@ -233,6 +241,7 @@ static struct attribute * kernel_attrs[] = { &fscaps_attr.attr, &uevent_seqnum_attr.attr, &cpu_byteorder_attr.attr, + &address_bits_attr.attr, #ifdef CONFIG_UEVENT_HELPER &uevent_helper_attr.attr, #endif |