s390: remove unused _swsusp_reset_dma

Since commit 39421627 ("s390: remove broken hibernate / power
management support") _swsusp_reset_dma is unused and could be safely
removed.
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/boot/startup.c

@@ -48,8 +48,6 @@ struct diag_ops __bootdata_preserved(diag_dma_ops) = {
 };
 static struct diag210 _diag210_tmp_dma __section(.dma.data);
 struct diag210 *__bootdata_preserved(__diag210_tmp_dma) = &_diag210_tmp_dma;
-void _swsusp_reset_dma(void);
-unsigned long __bootdata_preserved(__swsusp_reset_dma) = __pa(_swsusp_reset_dma);
 
 void error(char *x)
 {

arch/s390/boot/text_dma.S

@@ -96,23 +96,6 @@ ENTRY(_diag0c_dma)
 	BR_EX_DMA_r14
 ENDPROC(_diag0c_dma)
 
-/*
- * void _swsusp_reset_dma(void)
- */
-ENTRY(_swsusp_reset_dma)
-	larl	%r1,restart_entry
-	larl	%r2,.Lrestart_diag308_psw
-	og	%r1,0(%r2)
-	stg	%r1,0(%r0)
-	lghi	%r0,0
-	diag	%r0,%r0,0x308
-restart_entry:
-	lhi	%r1,1
-	sigp	%r1,%r0,SIGP_SET_ARCHITECTURE
-	sam64
-	BR_EX_DMA_r14
-ENDPROC(_swsusp_reset_dma)
-
 /*
  * void _diag308_reset_dma(void)
  *

arch/s390/include/asm/setup.h

@@ -92,7 +92,6 @@ extern int memory_end_set;
 extern unsigned long memory_end;
 extern unsigned long vmalloc_size;
 extern unsigned long max_physmem_end;
-extern unsigned long __swsusp_reset_dma;
 
 /* The Write Back bit position in the physaddr is given by the SLPC PCI */
 extern unsigned long mio_wb_bit_mask;

arch/s390/kernel/setup.c

@@ -102,7 +102,6 @@ struct mem_detect_info __bootdata(mem_detect);
 
 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
-unsigned long __bootdata_preserved(__swsusp_reset_dma);
 unsigned long __bootdata_preserved(__stext_dma);
 unsigned long __bootdata_preserved(__etext_dma);
 unsigned long __bootdata_preserved(__sdma);