/* * xchg/cmpxchg operations for the Hexagon architecture * * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ #ifndef _ASM_CMPXCHG_H #define _ASM_CMPXCHG_H /* * __xchg - atomically exchange a register and a memory location * @x: value to swap * @ptr: pointer to memory * @size: size of the value * * Only 4 bytes supported currently. * * Note: there was an errata for V2 about .new's and memw_locked. * */ static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size) { unsigned long retval; /* Can't seem to use printk or panic here, so just stop */ if (size != 4) do { asm volatile("brkpt;\n"); } while (1); __asm__ __volatile__ ( "1: %0 = memw_locked(%1);\n" /* load into retval */ " memw_locked(%1,P0) = %2;\n" /* store into memory */ " if !P0 jump 1b;\n" : "=&r" (retval) : "r" (ptr), "r" (x) : "memory", "p0" ); return retval; } /* * Atomically swap the contents of a register with memory. Should be atomic * between multiple CPU's and within interrupts on the same CPU. */ #define xchg(ptr, v) ((__typeof__(*(ptr)))__xchg((unsigned long)(v), (ptr), \ sizeof(*(ptr)))) /* * see rt-mutex-design.txt; cmpxchg supposedly checks if *ptr == A and swaps. * looks just like atomic_cmpxchg on our arch currently with a bunch of * variable casting. */ #define cmpxchg(ptr, old, new) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__(*(ptr)) __old = (old); \ __typeof__(*(ptr)) __new = (new); \ __typeof__(*(ptr)) __oldval = 0; \ \ asm volatile( \ "1: %0 = memw_locked(%1);\n" \ " { P0 = cmp.eq(%0,%2);\n" \ " if (!P0.new) jump:nt 2f; }\n" \ " memw_locked(%1,p0) = %3;\n" \ " if (!P0) jump 1b;\n" \ "2:\n" \ : "=&r" (__oldval) \ : "r" (__ptr), "r" (__old), "r" (__new) \ : "memory", "p0" \ ); \ __oldval; \ }) #endif /* _ASM_CMPXCHG_H */ pe='submit' value='search'/>
path: root/arch/mips/lasat/at93c.c
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authorTobias Klauser <tklauser@distanz.ch>2016-10-20 15:44:19 +0200
committerTobias Klauser <tklauser@distanz.ch>2017-02-15 10:34:18 +0100
commit5db4992d8f040b8d8db0b86d42806e0c417f7ccf (patch)
tree5b06e952af482d45f3ade64e77824662e34b7fa2 /arch/mips/lasat/at93c.c
parent370ebb0ef6255132373ed35d13e7b1d8d2eb7003 (diff)
usbnet: pegasus: Use net_device_stats from struct net_devicends-private-remove
Instead of using a private copy of struct net_device_stats in struct pegasus, use stats from struct net_device. Also remove the now unnecessary .ndo_get_stats function. Cc: Petko Manolov <petkan@nucleusys.com> Cc: linux-usb@vger.kernel.org Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Diffstat (limited to 'arch/mips/lasat/at93c.c')