JFIF$        dd7 

Viewing File: /usr/src/kernels/5.14.0-570.32.1.el9_6.x86_64/include/linux/processor.h

/* SPDX-License-Identifier: GPL-2.0 */
/* Misc low level processor primitives */
#ifndef _LINUX_PROCESSOR_H
#define _LINUX_PROCESSOR_H

#include <asm/processor.h>

/*
 * spin_begin is used before beginning a busy-wait loop, and must be paired
 * with spin_end when the loop is exited. spin_cpu_relax must be called
 * within the loop.
 *
 * The loop body should be as small and fast as possible, on the order of
 * tens of instructions/cycles as a guide. It should and avoid calling
 * cpu_relax, or any "spin" or sleep type of primitive including nested uses
 * of these primitives. It should not lock or take any other resource.
 * Violations of these guidelies will not cause a bug, but may cause sub
 * optimal performance.
 *
 * These loops are optimized to be used where wait times are expected to be
 * less than the cost of a context switch (and associated overhead).
 *
 * Detection of resource owner and decision to spin or sleep or guest-yield
 * (e.g., spin lock holder vcpu preempted, or mutex owner not on CPU) can be
 * tested within the loop body.
 */
#ifndef spin_begin
#define spin_begin()
#endif

#ifndef spin_cpu_relax
#define spin_cpu_relax() cpu_relax()
#endif

#ifndef spin_end
#define spin_end()
#endif

/*
 * spin_until_cond can be used to wait for a condition to become true. It
 * may be expected that the first iteration will true in the common case
 * (no spinning), so that callers should not require a first "likely" test
 * for the uncontended case before using this primitive.
 *
 * Usage and implementation guidelines are the same as for the spin_begin
 * primitives, above.
 */
#ifndef spin_until_cond
#define spin_until_cond(cond)					\
do {								\
	if (unlikely(!(cond))) {				\
		spin_begin();					\
		do {						\
			spin_cpu_relax();			\
		} while (!(cond));				\
		spin_end();					\
	}							\
} while (0)

#endif

#endif /* _LINUX_PROCESSOR_H */
Back to Directory  nL+D550H?Mx ,D"v]qv;6*Zqn)ZP0!1 A "#a$2Qr D8 a Ri[f\mIykIw0cuFcRı?lO7к_f˓[C$殷WF<_W ԣsKcëIzyQy/_LKℂ;C",pFA:/]=H  ~,ls/9ć:[=/#f;)x{ٛEQ )~ =𘙲r*2~ a _V=' kumFD}KYYC)({ *g&f`툪ry`=^cJ.I](*`wq1dđ#̩͑0;H]u搂@:~וKL Nsh}OIR*8:2 !lDJVo(3=M(zȰ+i*NAr6KnSl)!JJӁ* %݉?|D}d5:eP0R;{$X'xF@.ÊB {,WJuQɲRI;9QE琯62fT.DUJ;*cP A\ILNj!J۱+O\͔]ޒS߼Jȧc%ANolՎprULZԛerE2=XDXgVQeӓk yP7U*omQIs,K`)6\G3t?pgjrmۛجwluGtfh9uyP0D;Uڽ"OXlif$)&|ML0Zrm1[HXPlPR0'G=i2N+0e2]]9VTPO׮7h(F*癈'=QVZDF,d߬~TX G[`le69CR(!S2!P <0x<!1AQ "Raq02Br#SCTb ?Ζ"]mH5WR7k.ۛ!}Q~+yԏz|@T20S~Kek *zFf^2X*(@8r?CIuI|֓>^ExLgNUY+{.RѪ τV׸YTD I62'8Y27'\TP.6d&˦@Vqi|8-OΕ]ʔ U=TL8=;6c| !qfF3aů&~$l}'NWUs$Uk^SV:U# 6w++s&r+nڐ{@29 gL u"TÙM=6(^"7r}=6YݾlCuhquympǦ GjhsǜNlɻ}o7#S6aw4!OSrD57%|?x>L |/nD6?/8w#[)L7+6〼T ATg!%5MmZ/c-{1_Je"|^$'O&ޱմTrb$w)R$& N1EtdU3Uȉ1pM"N*(DNyd96.(jQ)X 5cQɎMyW?Q*!R>6=7)Xj5`J]e8%t!+'!1Q5 !1 AQaqё#2"0BRb?Gt^## .llQT $v,,m㵜5ubV =sY+@d{N! dnO<.-B;_wJt6;QJd.Qc%p{ 1,sNDdFHI0ГoXшe黅XۢF:)[FGXƹ/w_cMeD,ʡcc.WDtA$j@:) -# u c1<@ۗ9F)KJ-hpP]_x[qBlbpʖw q"LFGdƶ*s+ډ_Zc"?%t[IP 6J]#=ɺVvvCGsGh1 >)6|ey?Lӣm,4GWUi`]uJVoVDG< SB6ϏQ@ TiUlyOU0kfV~~}SZ@*WUUi##; s/[=!7}"WN]'(L! ~y5g9T̅JkbM' +s:S +B)v@Mj e Cf jE 0Y\QnzG1д~Wo{T9?`Rmyhsy3!HAD]mc1~2LSu7xT;j$`}4->L#vzŏILS ֭T{rjGKC;bpU=-`BsK.SFw4Mq]ZdHS0)tLg