19bc59bbed
This contains a new ticket-based spinlock that uses only generic atomics and doesn't require as much from the memory system as qspinlock does in order to be fair. It also includes a bit of documentation about the qspinlock and qrwlock fairness requirements. This will soon be used by a handful of architectures that don't meet the qspinlock requirements. -----BEGIN PGP SIGNATURE----- iQJHBAABCAAxFiEEKzw3R0RoQ7JKlDp6LhMZ81+7GIkFAmJ8BZETHHBhbG1lckBk YWJiZWx0LmNvbQAKCRAuExnzX7sYiWC2D/4qA9r9Niv/Vw9/H08+kefmYsVLjoZ7 n9tbS5+Rj/8TCwVpqQSkJix16XGVP760KT4XmmljJMNjKiHP4Vg8ZsNfewK6gxer Dk1MkrTEUk+yzCheyCFramwBmvz+tV1qDSq+/Lgl2jMDwlKRidVW3mGkeh4y+QRF Xvc3voW689ZGtnsPNjdAsXRKJrhTsdAXaj57RSiPXKGTJS5Ll+FO6pgNMW7fkAL3 XnWRVM03WpvNh70RcSV3jfZN2CSTRaw8d44CEOkGtbFTe9qwFkuSqhpTyCyfJ+NL 0Z3K4ZUypcjgC4lkxXJzvQhe5Vi3S7GFypzMeyAinjNegrXWY7Ke09mYClVPplwO kt2GTCmHcCMItZI9G7DLtYkNozlvNtCD0Qb63UptBxzqIedcKtNg+kY2Ovmnbi0A PeGN5OiARlpiwtYnJMh3fq5muMakDBm+You8u0tB0eKvBorvElteBwqwOg2zdhka iuoLtOtgD/Sx6UWvVeApx+vhlJ9WdOXDD9AZjsgbZDYvk+MX0lj8jvnS8jidDmAr j6jQ9qm2Ak7cUtZnz9hQKlDakqzNX8TsS7B91QV5nrJxwGJHCeqry066A4Sxmf4T mkNPfUfaBh1eBSaLzX+kaSMyFqNBeBopQNsH72zGKoYCYIJJxoOLBZbKuypJSVyf e0DDge2doJSwHg== =Ti7k -----END PGP SIGNATURE----- gpgsig -----BEGIN PGP SIGNATURE----- iQJHBAABCAAxFiEEAM520YNJYN/OiG3470yhUCzLq0EFAmKHzHUTHHBhbG1lckBk YWJiZWx0LmNvbQAKCRDvTKFQLMurQVHeD/9COIhijgH8Ki8xyc4xgDAv09bwhCyd Z2POGxxlzYmn0KBqY1K6UNEhJIFvKkWbNJl6oiLBqvfk3gRS0PWqNX6Z3bFZxOrA h5ArsC2d6giIol6SA7514ocsyMG0jgGcPuHPlhjkE6JzKPlMfdV90Y3ANSBN5Gc2 +ILpBkWHH6T/BE8rmXJnOu5ID8V4sp0lo5XhD40ezzjRQah/npXm0pkCE+YUVcWK ND5cDpHf4vsD495GhMD5xK/hail7zg2xGAr2KJnPGyTHxtnaP1KDI9lMVYCGMsLi x4RdM7iqRIWwhLfddupDyTiqt7yzW2PblJzHfpIPOPYLRpoz6i2CRvhM0sOwixie WLt8/BZnxDLO266cPytaGNlUcvrqOs7re6IZ1dxUt3zoWTpwHn/ONRvBm5gZnM/H lh93HIiVTgGqaPLGM25v2wuRDEh7bWVHwgDc8qdqTIRH11Y8alMjI9Q3Xc0GKjw2 4FRFGj1IR4+XE6++WufTAEj2wuhDegd+qZD4O/GW4624NUGgbY25fPZcDt3o1VMs OjrI08/xVotdOOADWfXKiQ4A2mriSLHeTwV5I/A1fgciA6/CpBycW8lIMGz8Wqwj Vi7R3ObpbrI/rzsoDmidODQd9q7S8c6jTqX8Q3iUEmVfQRhfWoAIgzILHwTzSdhA MkNPFyh0H4lG+A== =U6/l -----END PGP SIGNATURE----- Merge tag 'generic-ticket-spinlocks-v6' into for-next asm-generic: New generic ticket-based spinlock This contains a new ticket-based spinlock that uses only generic atomics and doesn't require as much from the memory system as qspinlock does in order to be fair. It also includes a bit of documentation about the qspinlock and qrwlock fairness requirements. This will soon be used by a handful of architectures that don't meet the qspinlock requirements. * tag 'generic-ticket-spinlocks-v6': csky: Move to generic ticket-spinlock RISC-V: Move to queued RW locks RISC-V: Move to generic spinlocks openrisc: Move to ticket-spinlock asm-generic: qrwlock: Document the spinlock fairness requirements asm-generic: qspinlock: Indicate the use of mixed-size atomics asm-generic: ticket-lock: New generic ticket-based spinlock