Typecasting a void pointer to unsigned long in zsmalloc.c

Greg KH greg at kroah.com
Thu Jan 23 10:59:18 EST 2025


On Thu, Jan 23, 2025 at 04:52:24PM +0100, Sotir Danailov wrote:
> What's the guarantee that an unsigned long can hold the data
> from the void pointer?

This is a requirement that Linux makes for the compiler to work with
it for any platform that Linux runs on.

> Is this safe to do?

Yes.

> Shouldn't there be a special type for doing this type of conversion?

That type is "unsigned long" :)

thanks,

greg k-h



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