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SubjectRe: [RFC PATCH] rootfs: Use tmpfs for rootfs even if root= is given
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On 10/31/23 16:33, H. Peter Anvin wrote:
> On October 31, 2023 10:11:01 AM PDT, Stefan Berger <stefanb@linux.ibm.com> wrote:
>>
>> On 10/31/23 12:56, Greg Kroah-Hartman wrote:
>>> On Tue, Oct 31, 2023 at 11:44:17AM -0400, Stefan Berger wrote:
>>>> rootfs currently does not use tmpfs if the root= boot option is passed
>>>> even though the documentation about rootfs (added in 6e19eded3684) in
>>>> Documentation/filesystems/ramfs-rootfs-initramfs.rst states:
>>>>
>>>> If CONFIG_TMPFS is enabled, rootfs will use tmpfs instead of ramfs by
>>>> default. To force ramfs, add "rootfstype=ramfs" to the kernel command
>>>> line.
>>> At this point in time, is there even any difference between ramfs and
>>> tmpfs anymore? Why would you want to choose one over the other here?
>>
>> CONFIG_TPMFS_XATTRS allows us to set xattrs, such as security.ima.
>>
>>    Stefan
>>
>>>
>>> thanks,
>>>
>>> greg k-h
> Why do we even keep ramfs as a standalone file system? To guarantee it cannot be swapped out? Does anyone actually use it?

Probably all machines that have root= on the boot command line use it...

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