alpha: fix the local TLB invalidate in the UP flush_tlb_page()

The uniprocessor flush_tlb_page() in asm/tlbflush.h has the same wrong
test as the SMP one: a targeted tbi() is only guaranteed to invalidate
the intended translations when the target mm's context is loaded, but
the gate is current->active_mm, which a lazily borrowed mm also
satisfies.

Test current->mm instead. The else branch it falls to already exists
here, so unlike the SMP side this is the whole fix.
arch/alpha/kernel/smp.c is not built with CONFIG_SMP=n, so this is how
the same defect reaches a uniprocessor, where the flusher kworker
necessarily shares the only CPU with the writer.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://lore.kernel.org/r/20261010142533.974797-7-linmag7@gmail.com
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>

0 files changed, 0 insertions, 0 deletions