August 2019 - kernelnewbies@kernelnewbies.org

perf open with "PERF_SAMPLE_REGS_USER" failing
by Probir Roy Aug. 7, 2019

Aug. 7, 2019

Hi, I am running following code where I am configuring an intel PEBS device with "PERF_SAMPLE_REGS_USER" on a sky lake machine (function initPEBS). Upon "perf_event_open" it returns with "Invalid argument"(22) error. I can configure without "PERF_SAMPLE_REGS_USER" and get sample events. I am on kernel version: 5.2.2 . Any idea what could be the issue? https://gist.github.com/proywm/36561da2a99f4ada8eafe8bdbdf3bbb7 -- Probir Roy

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wait_event()\ wait_event_interruptible()\ wait_event_interruptible_timeout() and wake_up()
by Muni Sekhar Aug. 6, 2019

Aug. 6, 2019

Hi All, Let us assume that multiple processes are waiting on wait_event()\ wait_event_interruptible()\ wait_event_interruptible_timeout(), which process gets woken up on calling wake_up()?? I presume wake_up() picks one process, but is there any algorithm to pick which process? -- Thanks, Sekhar

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Linux driver for the tplink archer t2uh using kernel 5.2.5
by Pastor Frank Ernesto Ramírez Torres Aug. 5, 2019

Aug. 5, 2019

This is dmesg output: New high-speed USB device number 4 using xhci_hcd New USB device found, idVendor=148f, idProduct=761a, bcdDevice = 1.00 New USB device strings: Mfr=1, Product=2, SerialNumber=3 Product: Wifi Manufacter: MediaTek SerialNumber: 1.0 reset high-speed USB device number 4 using xhci_hcd ASIC revision: 76100002 MAC revision: 76502000 mediatek/mt7610e.bin not found, switching to mediatek/mt7610u.bin Direct firmware load for mediatek/mt7610u.bin failed with error -2 probe of 1-1:1.0 failed with error -2 registered new interface driver mt76x0u lsusb output: Bus 001 Device 004: ID 148f:761a Ralink Technology, Corp.

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Frank
by Pastor Frank Ernesto Ramírez Torres Aug. 3, 2019

Aug. 3, 2019

Hi, I downloaded the Linux 5.2.5 kernel from your website. I have a tplink t2uh that I would like to operate on the Debian 9.0 system that I have installed. Note that there is an option in the configuration to compile the mt7610u driver. But after enabling it in .config, compile it, install it and connect the t2uh nothing happens. The dmesg tells me that it tries to load the mt7610e first but he does not find it. It changes for mt7610u and when trying to load it, error -2 occurs. Please, I am completely new compiling the Linux kernel, I would appreciate if someone taught me how to compile this driver correctly and see it work fine. Thank you very much in advance.

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WOL from S5 (shutdown)
by Abu Rasheda Aug. 1, 2019

Aug. 1, 2019

Hello, I understand how the computer running Linux would wake up from USB based ethernet from S3 (suspend) state. But, I am missing some piece of information for WOL on USB ethernet from S5 (shutdown). My driver is not working on the S5 state. Can someone help with pointers on the web or point me out a book or explain? Thanks. Abu Rasheda

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