€•å%      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ(/translations/zh_CN/scheduler/membarrier”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ(/translations/zh_TW/scheduler/membarrier”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ(/translations/it_IT/scheduler/membarrier”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ(/translations/ja_JP/scheduler/membarrier”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ(/translations/ko_KR/scheduler/membarrier”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒPortuguese (Brazilian)”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ(/translations/pt_BR/scheduler/membarrier”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh–sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ(/translations/sp_SP/scheduler/membarrier”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒcomment”“”)”}”(hŒ SPDX-License-Identifier: GPL-2.0”h]”hŒ SPDX-License-Identifier: GPL-2.0”…””}”hh·sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1hµhhh²hh³ŒB/var/lib/git/docbuild/linux/Documentation/scheduler/membarrier.rst”h´KubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒmembarrier() System Call”h]”hŒmembarrier() System Call”…””}”(hhÏh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhhÊh²hh³hÇh´KubhÉ)”}”(hhh]”(hÎ)”}”(hŒEMEMBARRIER_CMD_{PRIVATE,GLOBAL}_EXPEDITED - Architecture requirements”h]”hŒEMEMBARRIER_CMD_{PRIVATE,GLOBAL}_EXPEDITED - Architecture requirements”…””}”(hhàh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhhÝh²hh³hÇh´KubhÉ)”}”(hhh]”(hÎ)”}”(hŒ(Memory barriers before updating rq->curr”h]”hŒ(Memory barriers before updating rq->curr”…””}”(hhñh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhhîh²hh³hÇh´KubhŒ	paragraph”“”)”}”(hX¥  The commands MEMBARRIER_CMD_PRIVATE_EXPEDITED and MEMBARRIER_CMD_GLOBAL_EXPEDITED
require each architecture to have a full memory barrier after coming from
user-space, before updating rq->curr.  This barrier is implied by the sequence
rq_lock(); smp_mb__after_spinlock() in __schedule().  The barrier matches a full
barrier in the proximity of the membarrier system call exit, cf.
membarrier_{private,global}_expedited().”h]”hX¥  The commands MEMBARRIER_CMD_PRIVATE_EXPEDITED and MEMBARRIER_CMD_GLOBAL_EXPEDITED
require each architecture to have a full memory barrier after coming from
user-space, before updating rq->curr.  This barrier is implied by the sequence
rq_lock(); smp_mb__after_spinlock() in __schedule().  The barrier matches a full
barrier in the proximity of the membarrier system call exit, cf.
membarrier_{private,global}_expedited().”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÿh³hÇh´Khhîh²hubeh}”(h]”Œ'memory-barriers-before-updating-rq-curr”ah ]”h"]”Œ(memory barriers before updating rq->curr”ah$]”h&]”uh1hÈhhÝh²hh³hÇh´KubhÉ)”}”(hhh]”(hÎ)”}”(hŒ'Memory barriers after updating rq->curr”h]”hŒ'Memory barriers after updating rq->curr”…””}”(hj  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÍhj  h²hh³hÇh´Kubj   )”}”(hX  The commands MEMBARRIER_CMD_PRIVATE_EXPEDITED and MEMBARRIER_CMD_GLOBAL_EXPEDITED
require each architecture to have a full memory barrier after updating rq->curr,
before returning to user-space.  The schemes providing this barrier on the various
architectures are as follows.”h]”hX  The commands MEMBARRIER_CMD_PRIVATE_EXPEDITED and MEMBARRIER_CMD_GLOBAL_EXPEDITED
require each architecture to have a full memory barrier after updating rq->curr,
before returning to user-space.  The schemes providing this barrier on the various
architectures are as follows.”…””}”(hj(  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÿh³hÇh´Khj  h²hubhŒblock_quote”“”)”}”(hX   - alpha, arc, arm, hexagon, mips rely on the full barrier implied by
  spin_unlock() in finish_lock_switch().

- arm64 relies on the full barrier implied by switch_to().

- powerpc, riscv, s390, sparc, x86 rely on the full barrier implied by
  switch_mm(), if mm is not NULL; they rely on the full barrier implied
  by mmdrop(), otherwise.  On powerpc and riscv, switch_mm() relies on
  membarrier_arch_switch_mm().
”h]”hŒbullet_list”“”)”}”(hhh]”(hŒ	list_item”“”)”}”(hŒjalpha, arc, arm, hexagon, mips rely on the full barrier implied by
spin_unlock() in finish_lock_switch().
”h]”j   )”}”(hŒialpha, arc, arm, hexagon, mips rely on the full barrier implied by
spin_unlock() in finish_lock_switch().”h]”hŒialpha, arc, arm, hexagon, mips rely on the full barrier implied by
spin_unlock() in finish_lock_switch().”…””}”(hjG  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÿh³hÇh´KhjC  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jA  hj>  ubjB  )”}”(hŒ9arm64 relies on the full barrier implied by switch_to().
”h]”j   )”}”(hŒ8arm64 relies on the full barrier implied by switch_to().”h]”hŒ8arm64 relies on the full barrier implied by switch_to().”…””}”(hj_  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÿh³hÇh´Khj[  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jA  hj>  ubjB  )”}”(hŒípowerpc, riscv, s390, sparc, x86 rely on the full barrier implied by
switch_mm(), if mm is not NULL; they rely on the full barrier implied
by mmdrop(), otherwise.  On powerpc and riscv, switch_mm() relies on
membarrier_arch_switch_mm().
”h]”j   )”}”(hŒìpowerpc, riscv, s390, sparc, x86 rely on the full barrier implied by
switch_mm(), if mm is not NULL; they rely on the full barrier implied
by mmdrop(), otherwise.  On powerpc and riscv, switch_mm() relies on
membarrier_arch_switch_mm().”h]”hŒìpowerpc, riscv, s390, sparc, x86 rely on the full barrier implied by
switch_mm(), if mm is not NULL; they rely on the full barrier implied
by mmdrop(), otherwise.  On powerpc and riscv, switch_mm() relies on
membarrier_arch_switch_mm().”…””}”(hjw  h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÿh³hÇh´K!hjs  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jA  hj>  ubeh}”(h]”h ]”h"]”h$]”h&]”Œbullet”Œ-”uh1j<  h³hÇh´Khj8  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j6  h³hÇh´Khj  h²hubj   )”}”(hŒ…The barrier matches a full barrier in the proximity of the membarrier system call
entry, cf. membarrier_{private,global}_expedited().”h]”hŒ…The barrier matches a full barrier in the proximity of the membarrier system call
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