Messages in this thread | | | Date | Thu, 30 Aug 2012 14:21:55 -0500 | From | Kent Yoder <> | Subject | Re: [PATCH] tpm: fix tpm_acpi sparse warning on different address spaces |
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On Thu, Aug 30, 2012 at 10:45:56AM -0700, Dan Carpenter wrote: > On Thu, Aug 30, 2012 at 09:38:41AM -0500, Kent Yoder wrote: > > acpi_os_map_memory expects its return value to be in the __iomem address > > space. Cast it back later when used in a memcpy to avoid the same sparse > > warning there. > > > > Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com> > > I can't download linux-next right now but I don't think this is the > correct fix. I don't think you can memcpy() directly from __iomem. > The static checker is warning about a valid bug which should be > addressed instead of just casted away and silenced.
I took a look at other uses of the return from acpi_os_map_memory(), such as acpi_tb_parse_fadt(), which passes the returned pointer to acpi_tb_create_local_fadt(), which uses ACPI_MEMCPY on it, which is just memcpy. This code lives in drivers/acpi.
Kent
> > regards, > dan carpenter > >
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