dma: kmsan: export kmsan_handle_dma() for modules

JIRA: https://issues.redhat.com/browse/RHEL-116573

Upstream Status: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit 19fac3c
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Tue Feb 18 10:14:11 2025 +0100

    dma: kmsan: export kmsan_handle_dma() for modules

    kmsan_handle_dma() is used by virtio_ring() which can be built as a
    module.  kmsan_handle_dma() needs to be exported otherwise building the
    virtio_ring fails.

    Export kmsan_handle_dma for modules.

    Link: https://lkml.kernel.org/r/20250218091411.MMS3wBN9@linutronix.de
    Reported-by: kernel test robot <lkp@intel.com>
    Closes: https://lore.kernel.org/oe-kbuild-all/202502150634.qjxwSeJR-lkp@intel.com/
    Fixes: 7ade4f1 ("dma: kmsan: unpoison DMA mappings")
    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
    Cc: Alexander Potapenko <glider@google.com>
    Cc: Dmitriy Vyukov <dvyukov@google.com>
    Cc: Macro Elver <elver@google.com>
    Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: <stable@vger.kernel.org>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Signed-off-by: Eder Zulian <ezulian@redhat.com>

Author: efzrh

mm/kmsan/hooks.c

@@ -357,6 +357,7 @@ void kmsan_handle_dma(struct page *page, size_t offset, size_t size,
 		size -= to_go;
 	}
 }
+EXPORT_SYMBOL_GPL(kmsan_handle_dma);
 
 void kmsan_handle_dma_sg(struct scatterlist *sg, int nents,
 			 enum dma_data_direction dir)