Re: [PATCH] mm: don't convert the page to folio before splitting in split_huge_page()

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On 02.09.24 14:49, Pankaj Raghav (Samsung) wrote:
From: Pankaj Raghav <p.raghav@xxxxxxxxxxx>

Sven reported that a commit from bs > ps series was breaking the ksm ltp
test[1].

split_huge_page() takes precisely a page that is locked, and it also
expects the folio that contains that page to be locked after that
huge page has been split. The changes introduced converted the page to
folio, and passed the head page to be split, which might not be locked,
resulting in a kernel panic.

This commit fixes it by always passing the correct page to be split from
split_huge_page() with the appropriate minimum order for splitting.

Looks reasonable.

--
Cheers,

David / dhildenb





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