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SubjectRe: [PATCH v6 01/16] initrd: Add weakly-linked generic free_initrd_mem.
Hi Palmer,

Palmer Dabbelt <> writes:

> On Wed, 18 Apr 2018 04:10:16 PDT (-0700), wrote:
>> Hi all,
>> Shea Levy <> writes:
>>> This function is effectively identical across 14 architectures, and
>>> the generic implementation is small enough to be negligible in the
>>> architectures that do override it. Many of the remaining divergent
>>> implementations can be included in the common code path in future,
>>> further reducing code duplication and sharing improvements between
>>> architectures.
>>> Series boot-tested on RISC-V (which now uses the generic
>>> implementation) and x86_64 (which doesn't).
>>> v6: Add information about build/run testing.
>>> v5: Add more complete commit messages.
>>> v4: Use weak symbols instead of Kconfig.
>>> v3: Make the generic path opt-out instead of opt-in.
>>> v2: Mark generic free_initrd_mem __init.
>>> Signed-off-by: Shea Levy <>
>>> ---
>>> init/initramfs.c | 5 +++++
>>> 1 file changed, 5 insertions(+)
>>> diff --git a/init/initramfs.c b/init/initramfs.c
>>> index 7e99a0038942..c8fe150f958a 100644
>>> --- a/init/initramfs.c
>>> +++ b/init/initramfs.c
>>> @@ -526,6 +526,11 @@ extern unsigned long __initramfs_size;
>>> #include <linux/initrd.h>
>>> #include <linux/kexec.h>
>>> +void __init __weak free_initrd_mem(unsigned long start, unsigned long end)
>>> +{
>>> + free_reserved_area((void *)start, (void *)end, -1, "initrd");
>>> +}
>>> +
>>> static void __init free_initrd(void)
>>> {
>>> --
>>> 2.16.2
>> This series has been quiet for a few weeks other than picking up some
>> arch-specific acks. What is the next step here?
> I'm not sure. I don't really think it's sane for the RISC-V tree because it
> touches so many architectures -- I haven't looked closely, though.

Yeah, I think that makes sense.

> there's a slight behavior change to the RISC-V port, which I'd be OK taking
> through my tree (and then obviously the RISC-V cleanup as well, unless it goes
> in as a whole patch set).

So currently the behavior for RISC-V is changed by simply deleting the
arch-specific free_initrd_mem, which was a noop. Would you like me to
first submit a patch to have the arch-specific free_initrd_mem and then
change that in this series?

> For the IRQ cleanup I currently have in flight
> * Add the generic support
> * Move every arch over (RISC-V is in, the rest aren't yet)
> * Clean up a bit now that everyone is generic
> That lets all the arch-specific patches go in parallel, but can be a bit of a
> headache to manage.

With the current series, the first patch could go in on its own and all
of the arch-specific patches can go in in parallel if we wanted to, but
beyond the above-suggested implementation of the RISC-V free_initrd_mem
there's no real reordering meaningful here.

> I'm adding Arnd and Olof, as they know a lot more about Linux than I do.
> Here's the top-level of the v4 patch set:

And here's the top-level of v6, the latest:
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