The addr_lsb fields is only valid and available when the signal is SIGBUS and the si_code is BUS_MCEERR_AR or BUS_MCEERR_AO. Document this with a comment and place the field in the _sigfault union to make this clear. All of the fields stay in the same physical location so both the old and new definitions of struct siginfo will continue to work.
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| @@ -94,15 +94,23 @@ typedef struct siginfo { · 93 unmodified lines | |||
| 94 | unsigned int _flags; /* see ia64 si_flags */ | 94 | unsigned int _flags; /* see ia64 si_flags */ |
| 95 | unsigned long _isr; /* isr */ | 95 | unsigned long _isr; /* isr */ |
| 96 | #endif | 96 | #endif |
| 97 | short _addr_lsb; /* LSB of the reported address */ | ||
| 98 | union { | 97 | union { |
| 98 | /* | ||
| 99 | * used when si_code=BUS_MCEERR_AR or | ||
| 100 | * used when si_code=BUS_MCEERR_AO | ||
| 101 | */ | ||
| 102 | short _addr_lsb; /* LSB of the reported address */ | ||
| 99 | /* used when si_code=SEGV_BNDERR */ | 103 | /* used when si_code=SEGV_BNDERR */ |
| 100 | struct { | 104 | struct { |
| 105 | short _dummy_bnd; | ||
| 101 | void __user *_lower; | 106 | void __user *_lower; |
| 102 | void __user *_upper; | 107 | void __user *_upper; |
| 103 | } _addr_bnd; | 108 | } _addr_bnd; |
| 104 | /* used when si_code=SEGV_PKUERR */ | 109 | /* used when si_code=SEGV_PKUERR */ |
| 105 | __u32 _pkey; | 110 | struct { |
| 111 | short _dummy_pkey; | ||
| 112 | __u32 _pkey; | ||
| 113 | } _addr_pkey; | ||
| 106 | }; | 114 | }; |
| 107 | } _sigfault; | 115 | } _sigfault; |
| 108 | 116 | ||
| @@ -142,7 +150,7 @@ typedef struct siginfo { · 33 unmodified lines | |||
| 142 | #define si_addr_lsb _sifields._sigfault._addr_lsb | 150 | #define si_addr_lsb _sifields._sigfault._addr_lsb |
| 143 | #define si_lower _sifields._sigfault._addr_bnd._lower | 151 | #define si_lower _sifields._sigfault._addr_bnd._lower |
| 144 | #define si_upper _sifields._sigfault._addr_bnd._upper | 152 | #define si_upper _sifields._sigfault._addr_bnd._upper |
| 145 | #define si_pkey _sifields._sigfault._pkey | 153 | #define si_pkey _sifields._sigfault._addr_pkey._pkey |
| 146 | #define si_band _sifields._sigpoll._band | 154 | #define si_band _sifields._sigpoll._band |
| 147 | #define si_fd _sifields._sigpoll._fd | 155 | #define si_fd _sifields._sigpoll._fd |
| 148 | #define si_call_addr _sifields._sigsys._call_addr | 156 | #define si_call_addr _sifields._sigsys._call_addr |