diff -urN linux-2.4.32-libata1/drivers/scsi/libata-core.c linux-2.4.32-libata1-highmem/drivers/scsi/libata-core.c
--- linux-2.4.32-libata1/drivers/scsi/libata-core.c	2005-12-04 16:32:33.000000000 +0100
+++ linux-2.4.32-libata1-highmem/drivers/scsi/libata-core.c	2005-12-04 18:37:28.000000000 +0100
@@ -2424,9 +2424,9 @@
 		sg[qc->orig_n_elem - 1].length += qc->pad_len;
 		if (pad_buf) {
 			struct scatterlist *psg = &qc->pad_sgent;
-			void *addr = kmap_atomic(psg->page, KM_IRQ0);
+			void *addr = kmap_atomic(psg->page, KM_SOFTIRQ0);
 			memcpy(addr + psg->offset, pad_buf, qc->pad_len);
-			kunmap_atomic(psg->page, KM_IRQ0);
+			kunmap_atomic(psg->page, KM_SOFTIRQ0);
 		}
 	} else {
 		if (sg_dma_len(&sg[0]) > 0)
@@ -2698,9 +2698,9 @@
 		psg->offset = offset_in_page(offset);
 
 		if (qc->tf.flags & ATA_TFLAG_WRITE) {
-			void *addr = kmap_atomic(psg->page, KM_IRQ0);
+			void *addr = kmap_atomic(psg->page, KM_SOFTIRQ0);
 			memcpy(pad_buf, addr + psg->offset, qc->pad_len);
-			kunmap_atomic(psg->page, KM_IRQ0);
+			kunmap_atomic(psg->page, KM_SOFTIRQ0);
 		}
 
 		sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);