1Seq,Dir / Rule,Number,Source,Category,Checker Enabled,Enforced,Comments 21,D,1.1,MISRA C 2012,Required,N/A,Yes, 32,D,2.1,MISRA C 2012,Required,N/A,Yes, 43,D,3.1,MISRA C 2012,Required,N/A,No,It can’t be done retroactively. 54,D,4.1,MISRA C 2012,Required,N/A,Yes, 65,D,4.2,MISRA C 2012,Advisory,N/A,Yes, 76,D,4.3,MISRA C 2012,Required,Yes,Yes, 87,D,4.4,MISRA C 2012,Advisory,Yes,Yes, 98,D,4.5,MISRA C 2012,Advisory,Yes,Yes, 109,D,4.6,MISRA C 2012,Advisory,No,No,We use a mix of both. It would be too disruptive for the project to change. 1110,D,4.7,MISRA C 2012,Required,Yes,Yes, 1211,D,4.8,MISRA C 2012,Advisory,No,No,Fixing all instances would involve invasive changes to the codebase for no good reason. 1312,D,4.9,MISRA C 2012,Advisory,No,No,"We mustn’t introduce new macros unless strictly needed, but this affects assert(), INFO(), etc. It creates too much noise in the report for little gain." 1413,D,4.10,MISRA C 2012,Required,Yes,Yes, 1514,D,4.11,MISRA C 2012,Required,Yes,Yes, 1615,D,4.12,MISRA C 2012,Required,Yes,Yes, 1716,D,4.13,MISRA C 2012,Advisory,Yes,Yes, 1817,D,4.14,MISRA C 2012 AMD-1,Required,Yes,Yes, 1918,R,1.1,MISRA C 2012,Required,Yes,Yes, 2019,R,1.2,MISRA C 2012,Advisory,Yes,Optional,It bans __attribute__(()) and similar helpers. 2120,R,1.3,MISRA C 2012,Required,N/A,Yes, 2221,R,2.1,MISRA C 2012,Required,Yes,Yes, 2322,R,2.2,MISRA C 2012,Required,Yes,Yes, 2423,R,2.3,MISRA C 2012,Advisory,Yes,Optional,It prevents the usage of CASSERT(). 2524,R,2.4,MISRA C 2012,Advisory,No,No,Header files may use enumerations instead of defines to group sets of values. 2625,R,2.5,MISRA C 2012,Advisory,No,No,We define many headers with macros that are unused in the project but may be used by non-upstream code or may be desirable for completeness. 2726,R,2.6,MISRA C 2012,Advisory,Yes,Yes, 2827,R,2.7,MISRA C 2012,Advisory,No,No,Doesn't allow for simple implementations of porting functions that don't require all parameters. 2928,R,3.1,MISRA C 2012,Required,Yes,Yes, 3029,R,3.2,MISRA C 2012,Required,Yes,Yes, 3130,R,4.1,MISRA C 2012,Required,Yes,Yes, 3231,R,4.2,MISRA C 2012,Advisory,Yes,Yes, 3332,R,5.1,MISRA C 2012,Required,No,No,We use weak symbols that prevent us from complying with this rule. 3433,R,5.2,MISRA C 2012,Required,Yes,Yes, 3534,R,5.3,MISRA C 2012,Required,Yes,Yes, 3635,R,5.4,MISRA C 2012,Required,Yes,Yes, 3736,R,5.5,MISRA C 2012,Required,Yes,Yes, 3837,R,5.6,MISRA C 2012,Required,Yes,Yes, 3938,R,5.7,MISRA C 2012,Required,Yes,Optional,Fixing all existing defects is problematic because of compatibility issues. 4039,R,5.8,MISRA C 2012,Required,No,No,We use weak symbols that prevent us from complying with this rule. 4140,R,5.9,MISRA C 2012,Advisory,Yes,Yes, 4241,R,6.1,MISRA C 2012,Required,Yes,Yes, 4342,R,6.2,MISRA C 2012,Required,Yes,Yes, 4443,R,7.1,MISRA C 2012,Required,Yes,Yes, 4544,R,7.2,MISRA C 2012,Required,Yes,Yes, 4645,R,7.3,MISRA C 2012,Required,Yes,Yes, 4746,R,7.4,MISRA C 2012,Required,Yes,Yes, 4847,R,8.1,MISRA C 2012,Required,Yes,Yes, 4948,R,8.2,MISRA C 2012,Required,Yes,Yes, 5049,R,8.3,MISRA C 2012,Required,Yes,Yes, 5150,R,8.4,MISRA C 2012,Required,Yes,Yes, 5251,R,8.5,MISRA C 2012,Required,Yes,Yes, 5352,R,8.6,MISRA C 2012,Required,No,No,We use weak symbols that prevent us from complying with this rule. 5453,R,8.7,MISRA C 2012,Advisory,No,No,"Bans pattern of declaring funcs in private header that are used/defined in separate translation units, which seems over the top." 5554,R,8.8,MISRA C 2012,Required,Yes,Yes, 5655,R,8.9,MISRA C 2012,Advisory,Yes,Yes, 5756,R,8.10,MISRA C 2012,Required,Yes,Yes, 5857,R,8.11,MISRA C 2012,Advisory,Yes,Optional,This may not be possible in some interfaces. 5958,R,8.12,MISRA C 2012,Required,Yes,Yes, 6059,R,8.13,MISRA C 2012,Advisory,Yes,Optional,The benefits of fixing existing code aren’t worth the effort. 6160,R,8.14,MISRA C 2012,Required,Yes,Yes, 6261,R,9.1,MISRA C 2012,Mandatory,Yes,Yes, 6362,R,9.2,MISRA C 2012,Required,Yes,Yes, 6463,R,9.3,MISRA C 2012,Required,Yes,Yes, 6564,R,9.4,MISRA C 2012,Required,Yes,Yes, 6665,R,9.5,MISRA C 2012,Required,Yes,Yes, 6766,R,10.1,MISRA C 2012,Required,Yes,Optional,Fixing existing code may be counter-productive and introduce bugs. 6867,R,10.2,MISRA C 2012,Required,Yes,Yes, 6968,R,10.3,MISRA C 2012,Required,Yes,Optional,Fixing existing code may be counter-productive and introduce bugs. 7069,R,10.4,MISRA C 2012,Required,Yes,Optional,Fixing existing code may be counter-productive and introduce bugs. 7170,R,10.5,MISRA C 2012,Advisory,Yes,Yes, 7271,R,10.6,MISRA C 2012,Required,Yes,Yes, 7372,R,10.7,MISRA C 2012,Required,Yes,Yes, 7473,R,10.8,MISRA C 2012,Required,Yes,Yes, 7574,R,11.1,MISRA C 2012,Required,Yes,Yes, 7675,R,11.2,MISRA C 2012,Required,Yes,Yes, 7776,R,11.3,MISRA C 2012,Required,Yes,Yes, 7877,R,11.4,MISRA C 2012,Advisory,No,No,This would be invasive for TF (e.g. in exported linker script macros). Also bans conversion from uintptr_t. 7978,R,11.5,MISRA C 2012,Advisory,No,No,"This seems to preclude the pattern of using void * in interfaces to hide the real object, which we use extensively." 8079,R,11.6,MISRA C 2012,Required,Yes,Optional,This is needed in several cases. 8180,R,11.7,MISRA C 2012,Required,Yes,Yes, 8281,R,11.8,MISRA C 2012,Required,Yes,Yes, 8382,R,11.9,MISRA C 2012,Required,Yes,Yes, 8483,R,12.1,MISRA C 2012,Advisory,Yes,Yes, 8584,R,12.2,MISRA C 2012,Required,Yes,Yes,"This rule is fine, but there are lots of false positives in Coverity." 8685,R,12.3,MISRA C 2012,Advisory,Yes,Yes, 8786,R,12.4,MISRA C 2012,Advisory,Yes,Yes, 8887,R,12.5,MISRA C 2012 AMD-1,Mandatory,Yes,Yes, 8988,R,13.1,MISRA C 2012,Required,Yes,Yes, 9089,R,13.2,MISRA C 2012,Required,Yes,Yes, 9190,R,13.3,MISRA C 2012,Advisory,Yes,Yes, 9291,R,13.4,MISRA C 2012,Advisory,Yes,Yes, 9392,R,13.5,MISRA C 2012,Required,Yes,Yes, 9493,R,13.6,MISRA C 2012,Mandatory,Yes,Yes, 9594,R,14.1,MISRA C 2012,Required,Yes,Yes, 9695,R,14.2,MISRA C 2012,Required,Yes,Yes, 9796,R,14.3,MISRA C 2012,Required,Yes,Yes, 9897,R,14.4,MISRA C 2012,Required,Yes,Yes, 9998,R,15.1,MISRA C 2012,Advisory,No,No,In some cases goto may be useful for readability. 10099,R,15.2,MISRA C 2012,Required,Yes,Yes, 101100,R,15.3,MISRA C 2012,Required,Yes,Yes, 102101,R,15.4,MISRA C 2012,Advisory,Yes,Yes, 103102,R,15.5,MISRA C 2012,Advisory,No,No,This has no real value. It may make code less understandable than before. 104103,R,15.6,MISRA C 2012,Required,No,No,This directly contradicts the Linux style guidelines and would require many changes. We would have to remove that rule from checkpatch. 105104,R,15.7,MISRA C 2012,Required,Yes,Yes, 106105,R,16.1,MISRA C 2012,Required,No,No,Cannot comply with this unless we comply with 16.3 107106,R,16.2,MISRA C 2012,Required,Yes,Yes, 108107,R,16.3,MISRA C 2012,Required,No,No,Returns within switch statements and fall-throughs can improve readability. 109108,R,16.4,MISRA C 2012,Required,Yes,Yes, 110109,R,16.5,MISRA C 2012,Required,Yes,Yes, 111110,R,16.6,MISRA C 2012,Required,Yes,Yes, 112111,R,16.7,MISRA C 2012,Required,Yes,Yes, 113112,R,17.1,MISRA C 2012,Required,No,No,This is needed for printf. 114113,R,17.2,MISRA C 2012,Required,Yes,Yes,Bans recursion. We consider it acceptable if the max depth is known. 115114,R,17.3,MISRA C 2012,Mandatory,Yes,Yes, 116115,R,17.4,MISRA C 2012,Mandatory,Yes,Yes, 117116,R,17.5,MISRA C 2012,Advisory,Yes,Yes, 118117,R,17.6,MISRA C 2012,Mandatory,Yes,Yes, 119118,R,17.7,MISRA C 2012,Required,Yes,Optional,In some cases it doesn’t add any value to the code (like with memset() or printf()). 120119,R,17.8,MISRA C 2012,Advisory,Yes,Optional,It would make some one-line functions grow in size for no reason. 121120,R,18.1,MISRA C 2012,Required,Yes,Yes, 122121,R,18.2,MISRA C 2012,Required,Yes,Yes, 123122,R,18.3,MISRA C 2012,Required,Yes,Yes, 124123,R,18.4,MISRA C 2012,Advisory,Yes,Yes, 125124,R,18.5,MISRA C 2012,Advisory,Yes,Yes, 126125,R,18.6,MISRA C 2012,Required,Yes,Yes, 127126,R,18.7,MISRA C 2012,Required,Yes,Yes, 128127,R,18.8,MISRA C 2012,Required,Yes,Yes, 129128,R,19.1,MISRA C 2012,Mandatory,Yes,Yes, 130129,R,19.2,MISRA C 2012,Advisory,Yes,Optional,"Unions can be useful. We almost don’t use them, so it’s ok." 131130,R,20.1,MISRA C 2012,Advisory,Yes,Optional,In some files we have assembly-compatible includes followed by assembly-compatible definitions followed by C includes and C declarations. This is done to not have #ifdef in the include list. 132131,R,20.2,MISRA C 2012,Required,Yes,Yes, 133132,R,20.3,MISRA C 2012,Required,Yes,Yes, 134133,R,20.4,MISRA C 2012,Required,Yes,Yes, 135134,R,20.5,MISRA C 2012,Advisory,Yes,Yes, 136135,R,20.6,MISRA C 2012,Required,Yes,Yes, 137136,R,20.7,MISRA C 2012,Required,Yes,Yes, 138137,R,20.8,MISRA C 2012,Required,Yes,Optional,We need a new configuration system to fix all defects. 139138,R,20.9,MISRA C 2012,Required,Yes,Optional,"We use a mix of #if and #ifdef for boolean macros, which may raise some failures here. We should consistently use one or the other" 140139,R,20.10,MISRA C 2012,Advisory,Yes,Optional,"It’s good to avoid them, but they are sometimes needed." 141140,R,20.11,MISRA C 2012,Required,Yes,Yes, 142141,R,20.12,MISRA C 2012,Required,Yes,Yes, 143142,R,20.13,MISRA C 2012,Required,Yes,Yes, 144143,R,20.14,MISRA C 2012,Required,Yes,Yes, 145144,R,21.1,MISRA C 2012,Required,Yes,Yes, 146145,R,21.2,MISRA C 2012,Required,Yes,Yes, 147146,R,21.3,MISRA C 2012,Required,Yes,Yes, 148147,R,21.4,MISRA C 2012,Required,Yes,Yes, 149148,R,21.5,MISRA C 2012,Required,Yes,Yes, 150149,R,21.6,MISRA C 2012,Required,No,No,This bans printf. 151150,R,21.7,MISRA C 2012,Required,Yes,Yes, 152151,R,21.8,MISRA C 2012,Required,Yes,Yes, 153152,R,21.9,MISRA C 2012,Required,Yes,Yes, 154153,R,21.10,MISRA C 2012,Required,Yes,Yes, 155154,R,21.11,MISRA C 2012,Required,Yes,Yes, 156155,R,21.12,MISRA C 2012,Advisory,Yes,Yes, 157156,R,21.13,MISRA C 2012 AMD-1,Mandatory,Yes,Yes, 158157,R,21.14,MISRA C 2012 AMD-1,Required,Yes,Yes, 159158,R,21.15,MISRA C 2012 AMD-1,Required,Yes,Yes, 160159,R,21.16,MISRA C 2012 AMD-1,Required,Yes,Yes, 161160,R,21.17,MISRA C 2012 AMD-1,Mandatory,Yes,Yes, 162161,R,21.18,MISRA C 2012 AMD-1,Mandatory,Yes,Yes, 163162,R,21.19,MISRA C 2012 AMD-1,Mandatory,Yes,Yes, 164163,R,21.20,MISRA C 2012 AMD-1,Mandatory,Yes,Yes, 165164,R,22.1,MISRA C 2012,Required,Yes,Yes, 166165,R,22.2,MISRA C 2012,Mandatory,Yes,Yes, 167166,R,22.3,MISRA C 2012,Required,Yes,Yes, 168167,R,22.4,MISRA C 2012,Mandatory,Yes,Yes, 169168,R,22.5,MISRA C 2012,Mandatory,Yes,Yes, 170169,R,22.6,MISRA C 2012,Mandatory,Yes,Yes, 171170,R,22.7,MISRA C 2012 AMD-1,Required,Yes,Yes, 172171,R,22.8,MISRA C 2012 AMD-1,Required,Yes,Yes, 173172,R,22.9,MISRA C 2012 AMD-1,Required,Yes,Yes, 174173,R,22.10,MISRA C 2012 AMD-1,Required,Yes,Yes, 175