On Thursday, November 27, 2014 09:01:11 PM Pali Rohár wrote: > > --nextPart2712852.Yg3XtZvm05 > Content-Type: Text/Plain; > charset="utf-8" > Content-Transfer-Encoding: quoted-printable > > Hello, > > on 3.18-rc5 I have empty cpu uevent file, but modalias file is=20 > populated. See: > > $ cat /sys/devices/system/cpu/uevent=20 > $ cat /sys/devices/system/cpu/modalias=20 > cpu:type:x86,ven0000fam0006mod003C:feature:,0000,0001,0002,0003,0004,0005,0= > 006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,0015,0016,0017,0= > 018,0019,001A,001B,001C,001D,001F,002B,0034,003A,003B,003D,0068,006B,006C,0= > 06D,006F,0070,0072,0074,0075,0076,0078,007C,007D,0080,0081,0082,0083,0084,0= > 085,0086,0087,0088,0089,008B,008C,008D,008E,008F,0091,0093,0094,0095,0096,0= > 097,0098,0099,009A,009B,009C,009D,009E,00C0,00C5,00E0,00E1,00E3,00E5,00E6,0= > 0E7,0100,0101,0102,0103,0104,0120,0121,0123,0124,0125,0127,0128,0129,012A,0= > 12B,012D,0140 > > =46or all other devices in /sys/devices/ which have modalias=20 > content there is also MODALIAS=3D line in uevent file. /sys/devices/system/cpu/ is not a device. It is a "collection of all CPUs". > Is cpu device special? Or why it is only one device which has=20 > modalias file but is missing MODALIAS=3D line in uevent file? Look into the uevent files under /sys/devices/system/cpu/cpu0/ etc. > What userspace application should use for reading modalias=20 > string? File modalias or file uevent? The cpu modalias is used to trigger loading of some CPU-specific modules upfront IIRC. So yes, it is special. My advice would be to follow udev here. -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
