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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>
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Documentation/ABI/testing/sysfs-kernel-address_bits
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10
Documentation/ABI/testing/sysfs-kernel-address_bits
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What: /sys/kernel/address_bit
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Date: May 2023
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KernelVersion: 6.3
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Contact: Thomas Weißschuh <linux@weissschuh.net>
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Description:
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The address size of the running kernel in bits.
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Access: Read
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Users: util-linux
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@ -51,6 +51,14 @@ static ssize_t cpu_byteorder_show(struct kobject *kobj,
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}
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KERNEL_ATTR_RO(cpu_byteorder);
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/* address bits */
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static ssize_t address_bits_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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return sysfs_emit(buf, "%zu\n", sizeof(void *) * 8 /* CHAR_BIT */);
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}
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KERNEL_ATTR_RO(address_bits);
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#ifdef CONFIG_UEVENT_HELPER
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/* uevent helper program, used during early boot */
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static ssize_t uevent_helper_show(struct kobject *kobj,
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@ -233,6 +241,7 @@ static struct attribute * kernel_attrs[] = {
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&fscaps_attr.attr,
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&uevent_seqnum_attr.attr,
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&cpu_byteorder_attr.attr,
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&address_bits_attr.attr,
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#ifdef CONFIG_UEVENT_HELPER
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&uevent_helper_attr.attr,
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#endif
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