http://llvm.org/bugs/show_bug.cgi?id=9425
Summary: 'implicit conversion' warning for impossible path
Product: clang
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Blocks: 4068
compiling linux/i386 with clang r127235 produces this warning:
arch/x86/include/asm/dma-mapping.h:96:51: warning: implicit conversion from
'unsigned long long' to 'unsigned long' changes value from 18446744073709551615
to 4294967295 [-Wconstant-conversion]
dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) :
DMA_BIT_MASK(32);
^~~~~~~~~~~~~~~~
In file included from arch/x86/kernel/setup.c:48:
In file included from include/linux/pci.h:1227:
In file included from arch/x86/include/asm/pci.h:111:
In file included from include/asm-generic/pci-dma-compat.h:7:
include/linux/dma-mapping.h:55:40: note: instantiated from:
#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
~ ^~~~~
note this is the same expression that triggered another warning mentioned in
bug #9402 but this time it's the other branch of the conditional expression.
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