/* ----------------------------------------------------------------------- * * neon.uc - RAID-6 syndrome calculation using ARM NEON instructions * * Copyright (C) 2012 Rob Herring * Copyright (C) 2015 Linaro Ltd. * * Based on altivec.uc: * Copyright 2002-2004 H. Peter Anvin - 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 as published by * the Free Software Foundation, Inc., 53 Temple Place Ste 330, * Boston MA 02111-1307, USA; either version 2 of the License, or * (at your option) any later version; incorporated herein by reference. * * ----------------------------------------------------------------------- */ /* * neon$#.c * * $#-way unrolled NEON intrinsics math RAID-6 instruction set * * This file is postprocessed using unroll.awk */ #include typedef uint8x16_t unative_t; #define NBYTES(x) ((unative_t){x,x,x,x, x,x,x,x, x,x,x,x, x,x,x,x}) #define NSIZE sizeof(unative_t) /* * The SHLBYTE() operation shifts each byte left by 1, *not* * rolling over into the next byte */ static inline unative_t SHLBYTE(unative_t v) { return vshlq_n_u8(v, 1); } /* * The MASK() operation returns 0xFF in any byte for which the high * bit is 1, 0x00 for any byte for which the high bit is 0. */ static inline unative_t MASK(unative_t v) { const uint8x16_t temp = NBYTES(0); return (unative_t)vcltq_s8((int8x16_t)v, (int8x16_t)temp); } void raid6_neon$#_gen_syndrome_real(int disks, unsigned long bytes, void **ptrs) { uint8_t **dptr = (uint8_t **)ptrs; uint8_t *p, *q; int d, z, z0; register unative_t wd$$, wq$$, wp$$, w1$$, w2$$; const unative_t x1d = NBYTES(0x1d); z0 = disks - 3; /* Highest data disk */ p = dptr[z0+1]; /* XOR parity */ q = dptr[z0+2]; /* RS syndrome */ for ( d = 0 ; d < bytes ; d += NSIZE*$# ) { wq$$ = wp$$ = vld1q_u8(&dptr[z0][d+$$*NSIZE]); for ( z = z0-1 ; z >= 0 ; z-- ) { wd$$ = vld1q_u8(&dptr[z][d+$$*NSIZE]); wp$$ = veorq_u8(wp$$, wd$$); w2$$ = MASK(wq$$); w1$$ = SHLBYTE(wq$$); w2$$ = vandq_u8(w2$$, x1d); w1$$ = veorq_u8(w1$$, w2$$); wq$$ = veorq_u8(w1$$, wd$$); } vst1q_u8(&p[d+NSIZE*$$], wp$$); vst1q_u8(&q[d+NSIZE*$$], wq$$); } } void raid6_neon$#_xor_syndrome_real(int disks, int start, int stop, unsigned long bytes, void **ptrs) { uint8_t **dptr = (uint8_t **)ptrs; uint8_t *p, *q; int d, z, z0; register unative_t wd$$, wq$$, wp$$, w1$$, w2$$; const unative_t x1d = NBYTES(0x1d); z0 = stop; /* P/Q right side optimization */ p = dptr[disks-2]; /* XOR parity */ q = dptr[disks-1]; /* RS syndrome */ for ( d = 0 ; d < bytes ; d += NSIZE*$# ) { wq$$ = vld1q_u8(&dptr[z0][d+$$*NSIZE]); wp$$ = veorq_u8(vld1q_u8(&p[d+$$*NSIZE]), wq$$); /* P/Q data pages */ for ( z = z0-1 ; z >= start ; z-- ) { wd$$ = vld1q_u8(&dptr[z][d+$$*NSIZE]); wp$$ = veorq_u8(wp$$, wd$$); w2$$ = MASK(wq$$); w1$$ = SHLBYTE(wq$$); w2$$ = vandq_u8(w2$$, x1d); w1$$ = veorq_u8(w1$$, w2$$); wq$$ = veorq_u8(w1$$, wd$$); } /* P/Q left side optimization */ for ( z = start-1 ; z >= 0 ; z-- ) { w2$$ = MASK(wq$$); w1$$ = SHLBYTE(wq$$); w2$$ = vandq_u8(w2$$, x1d); wq$$ = veorq_u8(w1$$, w2$$); } w1$$ = vld1q_u8(&q[d+NSIZE*$$]); wq$$ = veorq_u8(wq$$, w1$$); vst1q_u8(&p[d+NSIZE*$$], wp$$); vst1q_u8(&q[d+NSIZE*$$], wq$$); } } class='content'>

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author	Steven Rostedt (VMware) <rostedt@goodmis.org>	2017-01-30 19:27:10 -0500
committer	Steven Rostedt (VMware) <rostedt@goodmis.org>	2017-01-31 09:13:49 -0500
commit	79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree	370efda701f03cccf21e02bb1fdd3b852547d75c /net/sctp/sm_statetable.c
parent	0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)

tracing: Fix hwlat kthread migration

The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

Diffstat (limited to 'net/sctp/sm_statetable.c')


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