[PATCH 10/12] kexec: arrange for paddr_vmcoreinfo_note() to return phys_addr_t

Mark Rutland mark.rutland at arm.com
Fri Apr 29 08:16:39 PDT 2016

On Fri, Apr 29, 2016 at 08:36:43PM +0530, Pratyush Anand wrote:
> > +       phys_addr_t vmcore_base = paddr_vmcoreinfo_note();
> > +       return sprintf(buf, "%pa %x\n", &vmcore_base,
> Why do we pass &vmcore_base? Shouldn't it be vmcore_base?

The %pa* printk format specifiers take the value by reference (as
phys_addr_t and friends are not necessarily the same width as a
pointer). Per Documentation/printk-formats.txt:

Physical addresses types phys_addr_t:

        %pa[p]  0x01234567 or 0x0123456789abcdef

        For printing a phys_addr_t type (and its derivatives, such as
        resource_size_t) which can vary based on build options, regardless of
        the width of the CPU data path. Passed by reference.

So the above prints the value of vmcore_base as expected.


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