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K7X3bFoxRFUeFfcboUDitgSrhcWfaCUQlyvaErQMvWzJ3m/u4gxSa1zs/6o56SNXEUtvbmZ4a7hi9a2Kedxu3Je5vwtGe21tVEe+R/zHMx/nHJRKGg0d8wvpNBw5DHrIOed3eY6FIR2nqvBX/BUbsF2TY03yZZaIP/XgagX379MfZU3bsbrGv8iabje/0+0ddsTd8gBAHgUxKrCTXZZKrIogoxAcnqmaIY/E/PIn37yTsCsE7JVybE8hV9U6hW1xOjCXHIBiESiVuWkFGRqNS2x55NjygUjt7FnjDp+ZOkyylE7UciV2f+a33dYFacBS8XYwVrUCkI8FyKe756+33LE8fPZ3/+HKn+pa1OXAxn44oVsY1EN/+3UrbK92NhA90Qc4StEiKvprixkYrAhvqd5cPGBgTrKBuq7NK7vm2kMKNvUos2252wfAUGxnAZzN06Q0P/XjMAOhq9Kg8V5WHXFKkVw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed Aug 12, 2026 at 2:48 PM EDT, Kairui Song via B4 Relay wrote: > From: Kairui Song > > Let each split helper handle its own locking instead of relying on > the caller, so both helpers manage their own irq and locking state. > This lets __folio_split() drop its local irq handling and fail label, > preparing for further cleanup. > > The file path now uses xas_lock_irq() instead of local_irq_disable() > with xas_lock(). The two are equivalent on non-RT, and > TRANSPARENT_HUGEPAGE cannot be enabled on RT anyway. This conversion > also buys consistency: every other place in mm/ that freezes a folio > while it is still reachable through the page cache already takes the > lock this way. This was actually the last plain xas_lock() on > mapping->i_pages left in mm. If we are going to support RT, spinning > on frozen folio refs could be a problem, but it already exists in > many places and should be fixed generically. > > The anon helper keeps a single local_irq_disable() as before, because > it has to cover several plain spinlocks at once. > > The dropped xas_reset() was a no-op as the xa_state is not walked > before the xas_load() under the lock. > > Signed-off-by: Kairui Song > --- > mm/huge_memory.c | 52 ++++++++++++++++++++++++--------------------------= -- > 1 file changed, 24 insertions(+), 28 deletions(-) > The changes look good to me and the commit message looks great! Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi