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Commit 16ecf85a authored by Linus Torvalds's avatar Linus Torvalds
Browse files

e1000: fix stack size 



Here's the patch. It shrinks the stack from 1152 bytes to 192 bytes (the
first version, that only did the e1000_option part, got it down to 600
bytes). About half comes from not using multiple "e1000_option"
structures, the other half comes from turning the "e1000_opt_list[]"
arrays into "static const" instead, so that gcc doesn't copy them onto the
stack.

Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Reveiewed-by: default avatarAuke Kok <auke-jan.h.kok@intel.com>
Tested-by: default avatarEmil Tantilov <emil.s.tantilov@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0559bc8e

drivers/net/e1000/e1000_param.c

+45 −36
Original line number Diff line number Diff line
@@ -208,7 +208,7 @@ struct e1000_option { 
		} r;

		struct { /* list_option info */

			int nr;

			struct e1000_opt_list { int i; char *str; } *p;

			const struct e1000_opt_list { int i; char *str; } *p;

		} l;

	} arg;

};
@@ -242,7 +242,7 @@ static int __devinit e1000_validate_option(unsigned int *value, 
		break;

	case list_option: {

		int i;

		struct e1000_opt_list *ent;

		const struct e1000_opt_list *ent;



		for (i = 0; i < opt->arg.l.nr; i++) {

			ent = &opt->arg.l.p[i];
@@ -279,7 +279,9 @@ static void e1000_check_copper_options(struct e1000_adapter *adapter); 


void __devinit e1000_check_options(struct e1000_adapter *adapter)

{

	struct e1000_option opt;

	int bd = adapter->bd_number;



	if (bd >= E1000_MAX_NIC) {

		DPRINTK(PROBE, NOTICE,

		       "Warning: no configuration for board #%i\n", bd);
@@ -287,19 +289,21 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter) 
	}



	{ /* Transmit Descriptor Count */

		struct e1000_option opt = {

		struct e1000_tx_ring *tx_ring = adapter->tx_ring;

		int i;

		e1000_mac_type mac_type = adapter->hw.mac_type;



		opt = (struct e1000_option) {

			.type = range_option,

			.name = "Transmit Descriptors",

			.err  = "using default of "

				__MODULE_STRING(E1000_DEFAULT_TXD),

			.def  = E1000_DEFAULT_TXD,

			.arg  = { .r = { .min = E1000_MIN_TXD }}

			.arg  = { .r = {

				.min = E1000_MIN_TXD,

				.max = mac_type < e1000_82544 ? E1000_MAX_TXD : E1000_MAX_82544_TXD

				}}

		};

		struct e1000_tx_ring *tx_ring = adapter->tx_ring;

		int i;

		e1000_mac_type mac_type = adapter->hw.mac_type;

		opt.arg.r.max = mac_type < e1000_82544 ?

			E1000_MAX_TXD : E1000_MAX_82544_TXD;



		if (num_TxDescriptors > bd) {

			tx_ring->count = TxDescriptors[bd];
@@ -313,19 +317,21 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter) 
			tx_ring[i].count = tx_ring->count;

	}

	{ /* Receive Descriptor Count */

		struct e1000_option opt = {

		struct e1000_rx_ring *rx_ring = adapter->rx_ring;

		int i;

		e1000_mac_type mac_type = adapter->hw.mac_type;



		opt = (struct e1000_option) {

			.type = range_option,

			.name = "Receive Descriptors",

			.err  = "using default of "

				__MODULE_STRING(E1000_DEFAULT_RXD),

			.def  = E1000_DEFAULT_RXD,

			.arg  = { .r = { .min = E1000_MIN_RXD }}

			.arg  = { .r = {

				.min = E1000_MIN_RXD,

				.max = mac_type < e1000_82544 ? E1000_MAX_RXD : E1000_MAX_82544_RXD

			}}

		};

		struct e1000_rx_ring *rx_ring = adapter->rx_ring;

		int i;

		e1000_mac_type mac_type = adapter->hw.mac_type;

		opt.arg.r.max = mac_type < e1000_82544 ? E1000_MAX_RXD :

			E1000_MAX_82544_RXD;



		if (num_RxDescriptors > bd) {

			rx_ring->count = RxDescriptors[bd];
@@ -339,7 +345,7 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter) 
			rx_ring[i].count = rx_ring->count;

	}

	{ /* Checksum Offload Enable/Disable */

		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = enable_option,

			.name = "Checksum Offload",

			.err  = "defaulting to Enabled",
@@ -363,7 +369,7 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter) 
			 { E1000_FC_FULL,    "Flow Control Enabled" },

			 { E1000_FC_DEFAULT, "Flow Control Hardware Default" }};



		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = list_option,

			.name = "Flow Control",

			.err  = "reading default settings from EEPROM",
@@ -381,7 +387,7 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter) 
		}

	}

	{ /* Transmit Interrupt Delay */

		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = range_option,

			.name = "Transmit Interrupt Delay",

			.err  = "using default of " __MODULE_STRING(DEFAULT_TIDV),
@@ -399,7 +405,7 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter) 
		}

	}

	{ /* Transmit Absolute Interrupt Delay */

		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = range_option,

			.name = "Transmit Absolute Interrupt Delay",

			.err  = "using default of " __MODULE_STRING(DEFAULT_TADV),
@@ -417,7 +423,7 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter) 
		}

	}

	{ /* Receive Interrupt Delay */

		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = range_option,

			.name = "Receive Interrupt Delay",

			.err  = "using default of " __MODULE_STRING(DEFAULT_RDTR),
@@ -435,7 +441,7 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter) 
		}

	}

	{ /* Receive Absolute Interrupt Delay */

		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = range_option,

			.name = "Receive Absolute Interrupt Delay",

			.err  = "using default of " __MODULE_STRING(DEFAULT_RADV),
@@ -453,7 +459,7 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter) 
		}

	}

	{ /* Interrupt Throttling Rate */

		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = range_option,

			.name = "Interrupt Throttling Rate (ints/sec)",

			.err  = "using default of " __MODULE_STRING(DEFAULT_ITR),
@@ -497,7 +503,7 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter) 
		}

	}

	{ /* Smart Power Down */

		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = enable_option,

			.name = "PHY Smart Power Down",

			.err  = "defaulting to Disabled",
@@ -513,7 +519,7 @@ void __devinit e1000_check_options(struct e1000_adapter *adapter) 
		}

	}

	{ /* Kumeran Lock Loss Workaround */

		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = enable_option,

			.name = "Kumeran Lock Loss Workaround",

			.err  = "defaulting to Enabled",
@@ -578,16 +584,18 @@ static void __devinit e1000_check_fiber_options(struct e1000_adapter *adapter) 


static void __devinit e1000_check_copper_options(struct e1000_adapter *adapter)

{

	struct e1000_option opt;

	unsigned int speed, dplx, an;

	int bd = adapter->bd_number;



	{ /* Speed */

		struct e1000_opt_list speed_list[] = {{          0, "" },

		static const struct e1000_opt_list speed_list[] = {

			{          0, "" },

			{   SPEED_10, "" },

			{  SPEED_100, "" },

			{ SPEED_1000, "" }};



		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = list_option,

			.name = "Speed",

			.err  = "parameter ignored",
@@ -604,11 +612,12 @@ static void __devinit e1000_check_copper_options(struct e1000_adapter *adapter) 
		}

	}

	{ /* Duplex */

		struct e1000_opt_list dplx_list[] = {{           0, "" },

		static const struct e1000_opt_list dplx_list[] = {

			{           0, "" },

			{ HALF_DUPLEX, "" },

			{ FULL_DUPLEX, "" }};



		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = list_option,

			.name = "Duplex",

			.err  = "parameter ignored",
@@ -637,7 +646,7 @@ static void __devinit e1000_check_copper_options(struct e1000_adapter *adapter) 
		       "parameter ignored\n");

		adapter->hw.autoneg_advertised = AUTONEG_ADV_DEFAULT;

	} else { /* Autoneg */

		struct e1000_opt_list an_list[] =

		static const struct e1000_opt_list an_list[] =

			#define AA "AutoNeg advertising "

			{{ 0x01, AA "10/HD" },

			 { 0x02, AA "10/FD" },
@@ -671,7 +680,7 @@ static void __devinit e1000_check_copper_options(struct e1000_adapter *adapter) 
			 { 0x2e, AA "1000/FD, 100/FD, 100/HD, 10/FD" },

			 { 0x2f, AA "1000/FD, 100/FD, 100/HD, 10/FD, 10/HD" }};



		struct e1000_option opt = {

		opt = (struct e1000_option) {

			.type = list_option,

			.name = "AutoNeg",

			.err  = "parameter ignored",