[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] x86emul: correct DECLARE_ALIGNED()
Stop creating an excessively large array on the stack, by properly taking into account the array element size when establishing its element count (and of course also when calculating the pointer to be actually used to access the memory). Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -553,10 +553,10 @@ typedef union { * the compiler for automatic variables. Use this helper to instantiate a * suitably aligned variable, producing a pointer to access it. */ -#define DECLARE_ALIGNED(type, var) \ - long __##var[sizeof(type) + __alignof(type) - __alignof(long)]; \ - type *const var##p = \ - (void *)((long)(__##var + __alignof(type) - __alignof(long)) \ +#define DECLARE_ALIGNED(type, var) \ + long __##var[(sizeof(type) + __alignof(type)) / __alignof(long) - 1]; \ + type *const var##p = \ + (void *)(((long)__##var + __alignof(type) - __alignof(__##var)) \ & -__alignof(type)) #ifdef __GCC_ASM_FLAG_OUTPUTS__ Attachment:
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