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returned as it is not possible to split a > folio when THP is disabled. > > Make all these functions return -EINVAL to indicate failure instead of > 0. As large folios depend on CONFIG_THP, issue warning as this function > should not be called without a large folio. > > Signed-off-by: Pankaj Raghav > --- > This issue was discovered while experimenting enabling large folios > without THP and found that returning 0 in these functions is resulting in > undefined behavior in truncate operations. This change fixes the issue. > > include/linux/huge_mm.h | 16 ++++++++++++---- > 1 file changed, 12 insertions(+), 4 deletions(-) > Acked-by: Zi Yan Best Regards, Yan, Zi