IB/hfi1: Constify struct flag_table

'struct flag_table' are not modified in this driver.

Constifying this structure moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig:
Before:
======
   text	   data	    bss	    dec	    hex	filename
 302932	  40271	    112	 343315	  53d13	drivers/infiniband/hw/hfi1/chip.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
 311636	  31567	    112	 343315	  53d13	drivers/infiniband/hw/hfi1/chip.o

Link: https://lore.kernel.org/r/782b6a648bfbbf2bb83f81a73c0460b5bb7642a1.1720959310.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

Author: tititiou36

drivers/infiniband/hw/hfi1/chip.c

@@ -251,7 +251,7 @@ struct flag_table {
 /*
  * CCE Error flags.
  */
-static struct flag_table cce_err_status_flags[] = {
+static const struct flag_table cce_err_status_flags[] = {
 /* 0*/	FLAG_ENTRY0("CceCsrParityErr",
 		CCE_ERR_STATUS_CCE_CSR_PARITY_ERR_SMASK),
 /* 1*/	FLAG_ENTRY0("CceCsrReadBadAddrErr",
@@ -341,7 +341,7 @@ static struct flag_table cce_err_status_flags[] = {
  * Misc Error flags
  */
 #define MES(text) MISC_ERR_STATUS_MISC_##text##_ERR_SMASK
-static struct flag_table misc_err_status_flags[] = {
+static const struct flag_table misc_err_status_flags[] = {
 /* 0*/	FLAG_ENTRY0("CSR_PARITY", MES(CSR_PARITY)),
 /* 1*/	FLAG_ENTRY0("CSR_READ_BAD_ADDR", MES(CSR_READ_BAD_ADDR)),
 /* 2*/	FLAG_ENTRY0("CSR_WRITE_BAD_ADDR", MES(CSR_WRITE_BAD_ADDR)),
@@ -360,7 +360,7 @@ static struct flag_table misc_err_status_flags[] = {
 /*
  * TXE PIO Error flags and consequences
  */
-static struct flag_table pio_err_status_flags[] = {
+static const struct flag_table pio_err_status_flags[] = {
 /* 0*/	FLAG_ENTRY("PioWriteBadCtxt",
 	SEC_WRITE_DROPPED,
 	SEND_PIO_ERR_STATUS_PIO_WRITE_BAD_CTXT_ERR_SMASK),
@@ -502,7 +502,7 @@ static struct flag_table pio_err_status_flags[] = {
 /*
  * TXE SDMA Error flags
  */
-static struct flag_table sdma_err_status_flags[] = {
+static const struct flag_table sdma_err_status_flags[] = {
 /* 0*/	FLAG_ENTRY0("SDmaRpyTagErr",
 		SEND_DMA_ERR_STATUS_SDMA_RPY_TAG_ERR_SMASK),
 /* 1*/	FLAG_ENTRY0("SDmaCsrParityErr",
@@ -530,7 +530,7 @@ static struct flag_table sdma_err_status_flags[] = {
  * TXE Egress Error flags
  */
 #define SEES(text) SEND_EGRESS_ERR_STATUS_##text##_ERR_SMASK
-static struct flag_table egress_err_status_flags[] = {
+static const struct flag_table egress_err_status_flags[] = {
 /* 0*/	FLAG_ENTRY0("TxPktIntegrityMemCorErr", SEES(TX_PKT_INTEGRITY_MEM_COR)),
 /* 1*/	FLAG_ENTRY0("TxPktIntegrityMemUncErr", SEES(TX_PKT_INTEGRITY_MEM_UNC)),
 /* 2 reserved */
@@ -631,7 +631,7 @@ static struct flag_table egress_err_status_flags[] = {
  * TXE Egress Error Info flags
  */
 #define SEEI(text) SEND_EGRESS_ERR_INFO_##text##_ERR_SMASK
-static struct flag_table egress_err_info_flags[] = {
+static const struct flag_table egress_err_info_flags[] = {
 /* 0*/	FLAG_ENTRY0("Reserved", 0ull),
 /* 1*/	FLAG_ENTRY0("VLErr", SEEI(VL)),
 /* 2*/	FLAG_ENTRY0("JobKeyErr", SEEI(JOB_KEY)),
@@ -680,7 +680,7 @@ static struct flag_table egress_err_info_flags[] = {
  * TXE Send error flags
  */
 #define SES(name) SEND_ERR_STATUS_SEND_##name##_ERR_SMASK
-static struct flag_table send_err_status_flags[] = {
+static const struct flag_table send_err_status_flags[] = {
 /* 0*/	FLAG_ENTRY0("SendCsrParityErr", SES(CSR_PARITY)),
 /* 1*/	FLAG_ENTRY0("SendCsrReadBadAddrErr", SES(CSR_READ_BAD_ADDR)),
 /* 2*/	FLAG_ENTRY0("SendCsrWriteBadAddrErr", SES(CSR_WRITE_BAD_ADDR))
@@ -689,7 +689,7 @@ static struct flag_table send_err_status_flags[] = {
 /*
  * TXE Send Context Error flags and consequences
  */
-static struct flag_table sc_err_status_flags[] = {
+static const struct flag_table sc_err_status_flags[] = {
 /* 0*/	FLAG_ENTRY("InconsistentSop",
 		SEC_PACKET_DROPPED | SEC_SC_HALTED,
 		SEND_CTXT_ERR_STATUS_PIO_INCONSISTENT_SOP_ERR_SMASK),
@@ -712,7 +712,7 @@ static struct flag_table sc_err_status_flags[] = {
  * RXE Receive Error flags
  */
 #define RXES(name) RCV_ERR_STATUS_RX_##name##_ERR_SMASK
-static struct flag_table rxe_err_status_flags[] = {
+static const struct flag_table rxe_err_status_flags[] = {
 /* 0*/	FLAG_ENTRY0("RxDmaCsrCorErr", RXES(DMA_CSR_COR)),
 /* 1*/	FLAG_ENTRY0("RxDcIntfParityErr", RXES(DC_INTF_PARITY)),
 /* 2*/	FLAG_ENTRY0("RxRcvHdrUncErr", RXES(RCV_HDR_UNC)),
@@ -847,7 +847,7 @@ static struct flag_table rxe_err_status_flags[] = {
  * DCC Error Flags
  */
 #define DCCE(name) DCC_ERR_FLG_##name##_SMASK
-static struct flag_table dcc_err_flags[] = {
+static const struct flag_table dcc_err_flags[] = {
 	FLAG_ENTRY0("bad_l2_err", DCCE(BAD_L2_ERR)),
 	FLAG_ENTRY0("bad_sc_err", DCCE(BAD_SC_ERR)),
 	FLAG_ENTRY0("bad_mid_tail_err", DCCE(BAD_MID_TAIL_ERR)),
@@ -900,7 +900,7 @@ static struct flag_table dcc_err_flags[] = {
  * LCB error flags
  */
 #define LCBE(name) DC_LCB_ERR_FLG_##name##_SMASK
-static struct flag_table lcb_err_flags[] = {
+static const struct flag_table lcb_err_flags[] = {
 /* 0*/	FLAG_ENTRY0("CSR_PARITY_ERR", LCBE(CSR_PARITY_ERR)),
 /* 1*/	FLAG_ENTRY0("INVALID_CSR_ADDR", LCBE(INVALID_CSR_ADDR)),
 /* 2*/	FLAG_ENTRY0("RST_FOR_FAILED_DESKEW", LCBE(RST_FOR_FAILED_DESKEW)),
@@ -943,7 +943,7 @@ static struct flag_table lcb_err_flags[] = {
  * DC8051 Error Flags
  */
 #define D8E(name) DC_DC8051_ERR_FLG_##name##_SMASK
-static struct flag_table dc8051_err_flags[] = {
+static const struct flag_table dc8051_err_flags[] = {
 	FLAG_ENTRY0("SET_BY_8051", D8E(SET_BY_8051)),
 	FLAG_ENTRY0("LOST_8051_HEART_BEAT", D8E(LOST_8051_HEART_BEAT)),
 	FLAG_ENTRY0("CRAM_MBE", D8E(CRAM_MBE)),
@@ -962,7 +962,7 @@ static struct flag_table dc8051_err_flags[] = {
  *
  * Flags in DC8051_DBG_ERR_INFO_SET_BY_8051.ERROR field.
  */
-static struct flag_table dc8051_info_err_flags[] = {
+static const struct flag_table dc8051_info_err_flags[] = {
 	FLAG_ENTRY0("Spico ROM check failed",  SPICO_ROM_FAILED),
 	FLAG_ENTRY0("Unknown frame received",  UNKNOWN_FRAME),
 	FLAG_ENTRY0("Target BER not met",      TARGET_BER_NOT_MET),
@@ -986,7 +986,7 @@ static struct flag_table dc8051_info_err_flags[] = {
  *
  * Flags in DC8051_DBG_ERR_INFO_SET_BY_8051.HOST_MSG field.
  */
-static struct flag_table dc8051_info_host_msg_flags[] = {
+static const struct flag_table dc8051_info_host_msg_flags[] = {
 	FLAG_ENTRY0("Host request done", 0x0001),
 	FLAG_ENTRY0("BC PWR_MGM message", 0x0002),
 	FLAG_ENTRY0("BC SMA message", 0x0004),
@@ -5275,7 +5275,7 @@ static int append_str(char *buf, char **curp, int *lenp, const char *s)
  * the buffer.  End in '*' if the buffer is too short.
  */
 static char *flag_string(char *buf, int buf_len, u64 flags,
-			 struct flag_table *table, int table_size)
+			 const struct flag_table *table, int table_size)
 {
 	char extra[32];
 	char *p = buf;