Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | Date | Fri, 29 Aug 2003 00:35:11 +0200 | From | "J.A. Magallon" <> | Subject | [2.4] gcc3 warns about type-punned pointers ? |
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Hi all...
gcc3 gives this warning when using the __set_64bit_var function:
/usr/src/linux/include/asm/system.h:190: warning: dereferencing type-punned pointer will break strict-aliasing rules
Is it a potential problem ?
This seems to cure it:
--- linux-2.4.22-jam1m/include/asm-i386/system.h.orig 2003-08-29 00:26:41.000000000 +0200 +++ linux-2.4.22-jam1m/include/asm-i386/system.h 2003-08-29 00:26:55.000000000 +0200 @@ -181,8 +181,8 @@ { __set_64bit(ptr,(unsigned int)(value), (unsigned int)((value)>>32ULL)); } -#define ll_low(x) *(((unsigned int*)&(x))+0) -#define ll_high(x) *(((unsigned int*)&(x))+1) +#define ll_low(x) *(((unsigned int*)(void*)&(x))+0) +#define ll_high(x) *(((unsigned int*)(void*)&(x))+1) static inline void __set_64bit_var (unsigned long long *ptr, unsigned long long value) A collateral question: why is the reason for this function ? long long assignments are not atomic in gcc ?
TIA
-- J.A. Magallon <jamagallon@able.es> \ Software is like sex: werewolf.able.es \ It's better when it's free Mandrake Linux release 9.2 (Cooker) for i586 Linux 2.4.22-jam1m (gcc 3.3.1 (Mandrake Linux 9.2 3.3.1-1mdk)) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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