[U-Boot] [PATCH V2] disk: make get_partition_info() always available to disk.c

Stephen Warren swarren at wwwdotorg.org
Sat Sep 22 00:53:05 CEST 2012

On 09/21/2012 04:51 PM, Tom Rini wrote:
> On Fri, Sep 21, 2012 at 04:46:54PM -0600, Stephen Warren wrote:
>> From: Stephen Warren <swarren at nvidia.com>
>> Now that get_device_and_partition() always calls
>> get_partition_info() when disk.c is compiled, we must always
>> compile the function, rather than ifdef it away.
>> The implementation must be conditional based on CONFIG_CMD_*
>> etc., since that's what e.g. part_dos.c uses to ifdef out
>> get_partition_info_dos(); CONFIG_DOS_PARTITION can be enabled
>> even without those commands being enabled.
>> Technically, this change is required before Rob's "disk/part:
>> introduce get_device_and_partition" patch. However, at least when
>> the compiler optimizer is turned on, it isn't required before
>> then in practice, since get_device_and_partition() calls
>> get_dev(), which is stubbed out in disk.c under exactly the same
>> conditions that get_partition_info() is not compiled, and hence
>> the compiler never generates code for the call to the missing
>> function. However, in my later patch "disk: 
>> get_device_and_partition() "auto" partition and cleanup", the
>> optimizer doesn't succeed at this, and may attempt to reference
>> the undefined function.
>> Signed-off-by: Stephen Warren <swarren at nvidia.com> --- v2: Add
>> CONFIG_CMD_* etc. ifdefs around the implementation.
>> Rob, I wonder if you shouldn't squash this into your series.
>> Then, I'll need to rebase mine on your again since this causes a
>> few nasty conflicts with my series.
> I _really_ want to see incremental changes.  It's one of the good 
> practices of the kernel folks and I'd like to see us do it as well
> as much as we can.

OK, well in that case, you can just apply the patch standalone before
you apply Rob's series then. I think we'll both need to rebase to
avoid conflict issues those - e.g. I edited the function that got
moved in my patch series and had to manually re-apply the change to
the new code location after I created this patch.

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