在 2024/8/21 19:28, Jonathan Cameron 写道:

On Tue, 20 Aug 2024 11:02:05 +0800
Tong Tiangen [off-list ref] wrote:

quoted

在 2024/8/19 19:56, Jonathan Cameron 写道:

quoted

On Tue, 28 May 2024 16:59:13 +0800
Tong Tiangen [off-list ref] wrote:
   

quoted

Currently, many scenarios that can tolerate memory errors when copying page
have been supported in the kernel[1~5], all of which are implemented by
copy_mc_[user]_highpage(). arm64 should also support this mechanism.

Due to mte, arm64 needs to have its own copy_mc_[user]_highpage()
architecture implementation, macros __HAVE_ARCH_COPY_MC_HIGHPAGE and
__HAVE_ARCH_COPY_MC_USER_HIGHPAGE have been added to control it.

Add new helper copy_mc_page() which provide a page copy implementation with
hardware memory error safe. The code logic of copy_mc_page() is the same as
copy_page(), the main difference is that the ldp insn of copy_mc_page()
contains the fixup type EX_TYPE_KACCESS_ERR_ZERO_ME_SAFE, therefore, the
main logic is extracted to copy_page_template.S.

[1] commit d302c2398ba2 ("mm, hwpoison: when copy-on-write hits poison, take page offline")
[2] commit 1cb9dc4b475c ("mm: hwpoison: support recovery from HugePage copy-on-write faults")
[3] commit 6b970599e807 ("mm: hwpoison: support recovery from ksm_might_need_to_copy()")
[4] commit 98c76c9f1ef7 ("mm/khugepaged: recover from poisoned anonymous memory")
[5] commit 12904d953364 ("mm/khugepaged: recover from poisoned file-backed memory")

Signed-off-by: Tong Tiangen <redacted>

Trivial stuff inline.

Jonathan

I'm sorry, I may not have understood what you meant. Where is the better
place to do inline? :)

Oops. All I meant was:

My comments are inline - as in within the patch later in the email.

OK, It's my fault for not getting your point :)

Thanks Jonathan.

.