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LinuxkernelcodingstyleThisisashortdocumentdescribingthepreferredcodingstyleforthelinuxkernel.Codingstyleisverypersonal,andIwon't_force_myviewsonanybody,butthisiswhatgoesforanythingthatIhavetobeabletomaintain,andI'dpreferitformostotherthingstoo.Pleaseatleastconsiderthepointsmadehere.Firstoff,I'dsuggestprintingoutacopyoftheGNUcodingstandards,andNOTreadit.Burnthem,it'sagreatsymbolicgesture.Anyway,heregoes:Chapter1:IndentationTabsare8characters,andthusindentationsarealso8characters.Therearehereticmovementsthattrytomakeindentations4(oreven2!)charactersdeep,andthatisakintotryingtodefinethevalueofPItobe3.Rationale:Thewholeideabehindindentationistoclearlydefinewhereablockofcontrolstartsandends.Especiallywhenyou'vebeenlookingatyourscreenfor20straighthours,you'llfinditaloteasiertoseehowtheindentationworksifyouhavelargeindentations.Now,somepeoplewillclaimthathaving8-characterindentationsmakesthecodemovetoofartotheright,andmakesithardtoreadona80-characterterminalscreen.Theanswertothatisthatifyouneedmorethan3levelsofindentation,you'rescrewedanyway,andshouldfixyourprogram.Inshort,8-charindentsmakethingseasiertoread,andhavetheaddedbenefitofwarningyouwhenyou'renestingyourfunctionstoodeep.Heedthatwarning.Thepreferredwaytoeasemultipleindentationlevelsinaswitchstatementistoalignthe"switch"anditssubordinate"case"labelsinthesamecolumninsteadof"double-indenting"the"case"labels.E.g.:switch(suffix){case'G':case'g':mem<<=30;break;case'M':case'm':mem<<=20;break;case'K':case'k':mem<<=10;/*fallthrough*/default:break;}Don'tputmultiplestatementsonasinglelineunlessyouhavesomethingtohide:if(condition)do_this;do_something_everytime;Don'tputmultipleassignmentsonasinglelineeither.Kernelcodingstyleissupersimple.Avoidtrickyexpressions.Outsideofcomments,documentationandexceptinKconfig,spacesareneverusedforindentation,andtheaboveexampleisdeliberatelybroken.Getadecenteditoranddon'tleavewhitespaceattheendoflines.Chapter2
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