Merge bk://kernel.bkbits.net/davem/sparc-2.6

into ppc970.osdl.org:/home/torvalds/v2.6/linux

arch/arm/common/sa1111.c

@@ -589,8 +589,7 @@ sa1111_init_one_child(struct sa1111 *sachip, struct resource *parent,
 			ret = dmabounce_register_dev(&dev->dev, 1024, 4096);
 			if (ret) {
 				printk("SA1111: Failed to register %s with dmabounce", dev->dev.bus_id);
-				kfree(dev);
-				device_unregister(dev);
+				device_unregister(&dev->dev);
 			}
 		}
 	}
@@ -779,8 +778,7 @@ int dma_needs_bounce(struct device *dev, dma_addr_t addr, size_t size)
 	/*
 	 * Check to see if either the start or end are illegal.
 	 */
-	return ((addr & ~(*dev->dma_mask))) ||
-		((addr + size - 1) & ~(*dev->dma_mask));
+	return ((addr & ~dma_mask)) || ((addr + size - 1) & ~dma_mask);
 }
 
 struct sa1111_save_data {

arch/arm/tools/mach-types

@@ -6,7 +6,7 @@
 # To add an entry into this database, please see Documentation/arm/README,
 # or contact rmk@arm.linux.org.uk
 #
-# Last update: Thu Apr 15 10:14:37 2004
+# Last update: Thu Apr 29 19:06:33 2004
 #
 # machine_is_xxx	CONFIG_xxxx		MACH_TYPE_xxx		number
 #
@@ -242,7 +242,7 @@ killbear		SA1100_KILLBEAR		KILLBEAR		230
 yoho			ARCH_YOHO		YOHO			231
 jasper			ARCH_JASPER		JASPER			232
 dsc25			ARCH_DSC25		DSC25			233
-innovator		ARCH_INNOVATOR		INNOVATOR		234
+omap_innovator		MACH_OMAP_INNOVATOR	OMAP_INNOVATOR		234
 ramses			ARCH_RAMSES		RAMSES			235
 s28x			ARCH_S28X		S28X			236
 mport3			ARCH_MPORT3		MPORT3			237
@@ -390,7 +390,7 @@ espd_4510b		ARCH_ESPD_4510B		ESPD_4510B		378
 mp1x			ARCH_MP1X		MP1X			379
 at91rm9200tb		ARCH_AT91RM9200TB	AT91RM9200TB		380
 adsvgx			ARCH_ADSVGX		ADSVGX			381
-omap_h2			ARCH_OMAP_H2		OMAP_H2			382
+omap_h2			MACH_OMAP_H2		OMAP_H2			382
 pelee			ARCH_PELEE		PELEE			383
 e740			MACH_E740		E740			384
 iq80331			ARCH_IQ80331		IQ80331			385
@@ -523,3 +523,13 @@ montajade		MACH_MONTAJADE		MONTAJADE		512
 sg560			MACH_SG560		SG560			513
 dp1000			MACH_DP1000		DP1000			514
 omap_osk		MACH_OMAP_OSK		OMAP_OSK		515
+rg100v3			MACH_RG100V3		RG100V3			516
+mx2ads			MACH_MX2ADS		MX2ADS			517
+pxa_kilo		MACH_PXA_KILO		PXA_KILO		518
+ixp4xx_eagle		MACH_IXP4XX_EAGLE	IXP4XX_EAGLE		519
+tosa			MACH_TOSA		TOSA			520
+mb2520f			MACH_MB2520F		MB2520F			521
+emc1000			MACH_EMC1000		EMC1000			522
+tidsc25			MACH_TIDSC25		TIDSC25			523
+akcpmxl			MACH_AKCPMXL		AKCPMXL			524
+av3xx			MACH_AV3XX		AV3XX			525

arch/ia64/kernel/efi.c

@@ -733,3 +733,47 @@ valid_phys_addr_range (unsigned long phys_addr, unsigned long *size)
 	return 0;
 }
 
+int __init
+efi_uart_console_only(void)
+{
+	efi_status_t status;
+	char *s, name[] = "ConOut";
+	efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
+	efi_char16_t *utf16, name_utf16[32];
+	unsigned char data[1024];
+	unsigned long size = sizeof(data);
+	struct efi_generic_dev_path *hdr, *end_addr;
+	int uart = 0;
+
+	/* Convert to UTF-16 */
+	utf16 = name_utf16;
+	s = name;
+	while (*s)
+		*utf16++ = *s++ & 0x7f;
+	*utf16 = 0;
+
+	status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
+	if (status != EFI_SUCCESS) {
+		printk(KERN_ERR "No EFI %s variable?\n", name);
+		return 0;
+	}
+
+	hdr = (struct efi_generic_dev_path *) data;
+	end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
+	while (hdr < end_addr) {
+		if (hdr->type == EFI_DEV_MSG &&
+		    hdr->sub_type == EFI_DEV_MSG_UART)
+			uart = 1;
+		else if (hdr->type == EFI_DEV_END_PATH ||
+			  hdr->type == EFI_DEV_END_PATH2) {
+			if (!uart)
+				return 0;
+			if (hdr->sub_type == EFI_DEV_END_ENTIRE)
+				return 1;
+			uart = 0;
+		}
+		hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
+	}
+	printk(KERN_ERR "Malformed %s value\n", name);
+	return 0;
+}

drivers/pcmcia/ti113x.h

@@ -150,6 +150,10 @@
 /* ExCA IO offset registers */
 #define TI113X_IO_OFFSET(map)		(0x36+((map)<<1))
 
+/* EnE test register */
+#define ENE_TEST_C9			0xc9	/* 8bit */
+#define ENE_TEST_C9_TLTENABLE		0x02
+
 #ifdef CONFIG_CARDBUS
 
 /*
@@ -160,6 +164,7 @@
 #define ti_devctl(socket)	((socket)->private[2])
 #define ti_diag(socket)		((socket)->private[3])
 #define ti_mfunc(socket)	((socket)->private[4])
+#define ene_test_c9(socket)	((socket)->private[5])
 
 /*
  * These are the TI specific power management handlers.
@@ -171,6 +176,9 @@ static void ti_save_state(struct yenta_socket *socket)
 	ti_cardctl(socket) = config_readb(socket, TI113X_CARD_CONTROL);
 	ti_devctl(socket) = config_readb(socket, TI113X_DEVICE_CONTROL);
 	ti_diag(socket) = config_readb(socket, TI1250_DIAGNOSTIC);
+
+	if (socket->dev->vendor == PCI_VENDOR_ID_ENE)
+		ene_test_c9(socket) = config_readb(socket, ENE_TEST_C9);
 }
 
 static void ti_restore_state(struct yenta_socket *socket)
@@ -180,6 +188,9 @@ static void ti_restore_state(struct yenta_socket *socket)
 	config_writeb(socket, TI113X_CARD_CONTROL, ti_cardctl(socket));
 	config_writeb(socket, TI113X_DEVICE_CONTROL, ti_devctl(socket));
 	config_writeb(socket, TI1250_DIAGNOSTIC, ti_diag(socket));
+
+	if (socket->dev->vendor == PCI_VENDOR_ID_ENE)
+		config_writeb(socket, ENE_TEST_C9, ene_test_c9(socket));
 }
 
 /*
@@ -591,6 +602,16 @@ static int ti12xx_override(struct yenta_socket *socket)
 		config_writel(socket, TI113X_SYSTEM_CONTROL, val);
 	}
 
+	/*
+	 * for EnE bridges only: clear testbit TLTEnable. this makes the
+	 * RME Hammerfall DSP sound card working.
+	 */
+	if (socket->dev->vendor == PCI_VENDOR_ID_ENE) {
+		u8 test_c9 = config_readb(socket, ENE_TEST_C9);
+		test_c9 &= ~ENE_TEST_C9_TLTENABLE;
+		config_writeb(socket, ENE_TEST_C9, test_c9);
+	}
+
 	/*
 	 * Yenta expects controllers to use CSCINT to route
 	 * CSC interrupts to PCI rather than INTVAL.

drivers/serial/8250_hcdp.c

@@ -11,6 +11,7 @@
  */
 
 #include <linux/config.h>
+#include <linux/console.h>
 #include <linux/kernel.h>
 #include <linux/efi.h>
 #include <linux/init.h>
@@ -44,6 +45,7 @@ setup_serial_hcdp(void *tablep)
 	unsigned long iobase;
 	hcdp_t hcdp;
 	int gsi, nr;
+	static char options[16];
 #if 0
 	static int shift_once = 1;
 #endif
@@ -147,7 +149,7 @@ setup_serial_hcdp(void *tablep)
 		printk("  gsi = %d, baud rate = %lu, bits = %d, clock = %d\n",
 		       gsi, (unsigned long) hcdp_dev->baud, hcdp_dev->bits,
 		       hcdp_dev->clock_rate);
-		if (hcdp_dev->base_addr.space_id == ACPI_PCICONF_SPACE)
+		if (HCDP_PCI_UART(hcdp_dev))
 			printk(" PCI id: %02x:%02x:%02x, vendor ID=0x%x, "
 				"dev ID=0x%x\n", hcdp_dev->pci_seg,
 				hcdp_dev->pci_bus, hcdp_dev->pci_dev,
@@ -179,16 +181,26 @@ setup_serial_hcdp(void *tablep)
 			printk(KERN_WARNING"warning: No support for PCI serial console\n");
 			return;
 		}
+
+		if (HCDP_IRQ_SUPPORTED(hcdp_dev)) {
 #ifdef CONFIG_IA64
-		port.irq = acpi_register_irq(gsi, ACPI_ACTIVE_HIGH,
-				ACPI_EDGE_SENSITIVE);
+			if (HCDP_PCI_UART(hcdp_dev))
+				port.irq = acpi_register_irq(gsi,
+					ACPI_ACTIVE_LOW, ACPI_LEVEL_SENSITIVE);
+			else
+				port.irq = acpi_register_irq(gsi,
+					ACPI_ACTIVE_HIGH, ACPI_EDGE_SENSITIVE);
 #else
 			port.irq = gsi;
 #endif
-		port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_RESOURCES;
-		if (gsi)
 			port.flags |= UPF_AUTO_IRQ;
 
+			if (HCDP_PCI_UART(hcdp_dev))
+				port.flags |= UPF_SHARE_IRQ;
+		}
+
+		port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_RESOURCES;
+
 		/*
 		 * Note: the above memset() initializes port.line to 0,
 		 * so we register this port as ttyS0.
@@ -197,8 +209,15 @@ setup_serial_hcdp(void *tablep)
 			printk("setup_serial_hcdp(): early_serial_setup() "
 				"for HCDP serial console port failed. "
 				"Will try any additional consoles in HCDP.\n");
+			memset(&port, 0, sizeof(port));
 			continue;
 		}
+
+		if (efi_uart_console_only()) {
+			snprintf(options, sizeof(options), "%lun%d",
+				hcdp_dev->baud, hcdp_dev->bits);
+			add_preferred_console("ttyS", port.line, options);
+		}
 		break;
 	}
 

drivers/serial/8250_hcdp.h

@@ -77,3 +77,6 @@ typedef struct {
 	u32	num_entries;
 	hcdp_dev_t	hcdp_dev[MAX_HCDP_DEVICES];
 } hcdp_t;
+
+#define HCDP_PCI_UART(x) (x->pci_func & 1UL<<7)
+#define HCDP_IRQ_SUPPORTED(x) (x->pci_func & 1UL<<6)

drivers/serial/8250_pci.c

@@ -20,6 +20,7 @@
 #include <linux/string.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
+#include <linux/delay.h>
 #include <linux/tty.h>
 #include <linux/serial.h>
 #include <linux/serial_core.h>
@@ -305,6 +306,72 @@ static void __devexit pci_plx9050_exit(struct pci_dev *dev)
 	}
 }
 
+/* SBS Technologies Inc. PMC-OCTPRO and P-OCTAL cards */
+static int
+sbs_setup(struct pci_dev *dev, struct pci_board *board,
+		struct serial_struct *req, int idx)
+{
+	unsigned int bar, offset = board->first_offset;
+
+	bar = 0;
+
+	if (idx < 4) {
+		/* first four channels map to 0, 0x100, 0x200, 0x300 */
+		offset += idx * board->uart_offset;
+	} else if (idx < 8) {
+		/* last four channels map to 0x1000, 0x1100, 0x1200, 0x1300 */
+		offset += idx * board->uart_offset + 0xC00;
+	} else /* we have only 8 ports on PMC-OCTALPRO */
+		return 1;
+
+	return setup_port(dev, req, bar, offset, board->reg_shift);
+}
+
+/*
+* This does initialization for PMC OCTALPRO cards:
+* maps the device memory, resets the UARTs (needed, bc
+* if the module is removed and inserted again, the card
+* is in the sleep mode) and enables global interrupt.
+*/
+
+/* global control register offset for SBS PMC-OctalPro */
+#define OCT_REG_CR_OFF		0x500
+
+static int __devinit sbs_init(struct pci_dev *dev)
+{
+	u8 * p;
+
+	p = ioremap(pci_resource_start(dev, 0),pci_resource_len(dev,0));
+
+	if (p == NULL)
+		return -ENOMEM;
+	/* Set bit-4 Control Register (UART RESET) in to reset the uarts */
+	writeb(0x10,p + OCT_REG_CR_OFF);
+	udelay(50);
+	writeb(0x0,p + OCT_REG_CR_OFF);
+
+	/* Set bit-2 (INTENABLE) of Control Register */
+	writeb(0x4, p + OCT_REG_CR_OFF);
+	iounmap(p);
+
+	return 0;
+}
+
+/*
+ * Disables the global interrupt of PMC-OctalPro
+ */
+
+static void __devexit sbs_exit(struct pci_dev *dev)
+{
+	u8 * p;
+
+	p = ioremap(pci_resource_start(dev, 0),pci_resource_len(dev,0));
+	if (p != NULL) {
+		writeb(0, p + OCT_REG_CR_OFF);
+	}
+	iounmap(p);
+}
+
 /*
  * SIIG serial cards have an PCI interface chip which also controls
  * the UART clocking frequency. Each UART can be clocked independently
@@ -534,6 +601,15 @@ pci_default_setup(struct pci_dev *dev, struct pci_board *board,
 	return setup_port(dev, req, bar, offset, board->reg_shift);
 }
 
+/* This should be in linux/pci_ids.h */
+#define PCI_VENDOR_ID_SBSMODULARIO	0x124B
+#define PCI_SUBVENDOR_ID_SBSMODULARIO	0x124B
+#define PCI_DEVICE_ID_OCTPRO		0x0001
+#define PCI_SUBDEVICE_ID_OCTPRO232	0x0108
+#define PCI_SUBDEVICE_ID_OCTPRO422	0x0208
+#define PCI_SUBDEVICE_ID_POCTAL232	0x0308
+#define PCI_SUBDEVICE_ID_POCTAL422	0x0408
+
 /*
  * Master list of serial port init/setup/exit quirks.
  * This does not describe the general nature of the port.
@@ -618,6 +694,55 @@ static struct pci_serial_quirk pci_serial_quirks[] = {
 		.setup		= pci_default_setup,
 		.exit		= __devexit_p(pci_plx9050_exit),
 	},
+	/*
+	 * SBS Technologies, Inc., PMC-OCTALPRO 232
+	 */
+	{
+		.vendor		= PCI_VENDOR_ID_SBSMODULARIO,
+		.device		= PCI_DEVICE_ID_OCTPRO,
+		.subvendor	= PCI_SUBVENDOR_ID_SBSMODULARIO,
+		.subdevice	= PCI_SUBDEVICE_ID_OCTPRO232,
+		.init		= sbs_init,
+		.setup		= sbs_setup,
+		.exit		= sbs_exit
+	},
+	/*
+	 * SBS Technologies, Inc., PMC-OCTALPRO 422
+	 */
+	{
+		.vendor		= PCI_VENDOR_ID_SBSMODULARIO,
+		.device		= PCI_DEVICE_ID_OCTPRO,
+		.subvendor	= PCI_SUBVENDOR_ID_SBSMODULARIO,
+		.subdevice	= PCI_SUBDEVICE_ID_OCTPRO422,
+		.init		= sbs_init,
+		.setup		= sbs_setup,
+		.exit		= sbs_exit
+	},
+	/*
+	 * SBS Technologies, Inc., P-Octal 232
+	 */
+	{
+		.vendor		= PCI_VENDOR_ID_SBSMODULARIO,
+		.device		= PCI_DEVICE_ID_OCTPRO,
+		.subvendor	= PCI_SUBVENDOR_ID_SBSMODULARIO,
+		.subdevice	= PCI_SUBDEVICE_ID_POCTAL232,
+		.init		= sbs_init,
+		.setup		= sbs_setup,
+		.exit		= sbs_exit
+	},
+	/*
+	 * SBS Technologies, Inc., P-Octal 422
+	 */
+	{
+		.vendor		= PCI_VENDOR_ID_SBSMODULARIO,
+		.device		= PCI_DEVICE_ID_OCTPRO,
+		.subvendor	= PCI_SUBVENDOR_ID_SBSMODULARIO,
+		.subdevice	= PCI_SUBDEVICE_ID_POCTAL422,
+		.init		= sbs_init,
+		.setup		= sbs_setup,
+		.exit		= sbs_exit
+	},
+
 	/*
 	 * SIIG cards.
 	 *  It is not clear whether these could be collapsed.
@@ -944,8 +1069,19 @@ enum pci_board_num_t {
 	pbn_computone_4,
 	pbn_computone_6,
 	pbn_computone_8,
+	pbn_sbsxrsio,
 };
 
+/*
+ * uart_offset - the space between channels
+ * reg_shift   - describes how the UART registers are mapped
+ *               to PCI memory by the card.
+ * For example IER register on SBS, Inc. PMC-OctPro is located at
+ * offset 0x10 from the UART base, while UART_IER is defined as 1
+ * in include/linux/serial_reg.h,
+ * see first lines of serial_in() and serial_out() in 8250.c
+*/
+
 static struct pci_board pci_boards[] __devinitdata = {
 	[pbn_default] = {
 		.flags		= FL_BASE0,
@@ -1348,6 +1484,13 @@ static struct pci_board pci_boards[] __devinitdata = {
 		.reg_shift	= 2,
 		.first_offset	= 0x200,
 	},
+	[pbn_sbsxrsio] = {
+		.flags		= FL_BASE0,
+		.num_ports	= 8,
+		.base_baud	= 460800,
+		.uart_offset	= 256,
+		.reg_shift	= 4,
+	}
 };
 
 /*
@@ -1776,6 +1919,23 @@ static struct pci_device_id serial_pci_tbl[] = {
 		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 		pbn_b0_bt_2_921600 },
 
+	/*
+	 * SBS Technologies, Inc. P-Octal and PMC-OCTPRO cards,
+	 * from skokodyn@yahoo.com
+	 */
+	{	PCI_VENDOR_ID_SBSMODULARIO, PCI_DEVICE_ID_OCTPRO,
+		PCI_SUBVENDOR_ID_SBSMODULARIO, PCI_SUBDEVICE_ID_OCTPRO232, 0, 0,
+		pbn_sbsxrsio },
+	{	PCI_VENDOR_ID_SBSMODULARIO, PCI_DEVICE_ID_OCTPRO,
+		PCI_SUBVENDOR_ID_SBSMODULARIO, PCI_SUBDEVICE_ID_OCTPRO422, 0, 0,
+		pbn_sbsxrsio },
+	{	PCI_VENDOR_ID_SBSMODULARIO, PCI_DEVICE_ID_OCTPRO,
+		PCI_SUBVENDOR_ID_SBSMODULARIO, PCI_SUBDEVICE_ID_POCTAL232, 0, 0,
+		pbn_sbsxrsio },
+	{	PCI_VENDOR_ID_SBSMODULARIO, PCI_DEVICE_ID_OCTPRO,
+		PCI_SUBVENDOR_ID_SBSMODULARIO, PCI_SUBDEVICE_ID_POCTAL422, 0, 0,
+		pbn_sbsxrsio },
+
 	/*
 	 * Digitan DS560-558, from jimd@esoft.com
 	 */

include/linux/efi.h

@@ -212,6 +212,9 @@ typedef efi_status_t efi_set_virtual_address_map_t (unsigned long memory_map_siz
 #define UGA_IO_PROTOCOL_GUID \
     EFI_GUID(  0x61a4d49e, 0x6f68, 0x4f1b, 0xb9, 0x22, 0xa8, 0x6e, 0xed, 0xb, 0x7, 0xa2 )
 
+#define EFI_GLOBAL_VARIABLE_GUID \
+    EFI_GUID(  0x8be4df61, 0x93ca, 0x11d2, 0xaa, 0x0d, 0x00, 0xe0, 0x98, 0x03, 0x2b, 0x8c )
+
 typedef struct {
 	efi_guid_t guid;
 	unsigned long table;
@@ -294,6 +297,7 @@ extern void efi_enter_virtual_mode (void);	/* switch EFI to virtual mode, if pos
 extern u64 efi_get_iobase (void);
 extern u32 efi_mem_type (unsigned long phys_addr);
 extern u64 efi_mem_attributes (unsigned long phys_addr);
+extern int __init efi_uart_console_only (void);
 extern void efi_initialize_iomem_resources(struct resource *code_resource,
 					struct resource *data_resource);
 extern efi_status_t phys_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc);
@@ -322,6 +326,49 @@ extern struct efi_memory_map memmap;
 #define EFI_VARIABLE_BOOTSERVICE_ACCESS 0x0000000000000002
 #define EFI_VARIABLE_RUNTIME_ACCESS     0x0000000000000004
 
+/*
+ * EFI Device Path information
+ */
+#define EFI_DEV_HW			0x01
+#define  EFI_DEV_PCI				 1
+#define  EFI_DEV_PCCARD				 2
+#define  EFI_DEV_MEM_MAPPED			 3
+#define  EFI_DEV_VENDOR				 4
+#define  EFI_DEV_CONTROLLER			 5
+#define EFI_DEV_ACPI			0x02
+#define   EFI_DEV_BASIC_ACPI			 1
+#define   EFI_DEV_EXPANDED_ACPI			 2
+#define EFI_DEV_MSG			0x03
+#define   EFI_DEV_MSG_ATAPI			 1
+#define   EFI_DEV_MSG_SCSI			 2
+#define   EFI_DEV_MSG_FC			 3
+#define   EFI_DEV_MSG_1394			 4
+#define   EFI_DEV_MSG_USB			 5
+#define   EFI_DEV_MSG_USB_CLASS			15
+#define   EFI_DEV_MSG_I20			 6
+#define   EFI_DEV_MSG_MAC			11
+#define   EFI_DEV_MSG_IPV4			12
+#define   EFI_DEV_MSG_IPV6			13
+#define   EFI_DEV_MSG_INFINIBAND		 9
+#define   EFI_DEV_MSG_UART			14
+#define   EFI_DEV_MSG_VENDOR			10
+#define EFI_DEV_MEDIA			0x04
+#define   EFI_DEV_MEDIA_HARD_DRIVE		 1
+#define   EFI_DEV_MEDIA_CDROM			 2
+#define   EFI_DEV_MEDIA_VENDOR			 3
+#define   EFI_DEV_MEDIA_FILE			 4
+#define   EFI_DEV_MEDIA_PROTOCOL		 5
+#define EFI_DEV_BIOS_BOOT		0x05
+#define EFI_DEV_END_PATH		0x7F
+#define EFI_DEV_END_PATH2		0xFF
+#define   EFI_DEV_END_INSTANCE			0x01
+#define   EFI_DEV_END_ENTIRE			0xFF
+
+struct efi_generic_dev_path {
+	u8 type;
+	u8 sub_type;
+	u16 length;
+} __attribute ((packed));
 
 /*
  * efi_dir is allocated in arch/ia64/kernel/efi.c.

ipc/mqueue.c

@@ -811,9 +811,9 @@ asmlinkage long sys_mq_timedsend(mqd_t mqdes, const char __user *u_msg_ptr,
 			wait.msg = (void *) msg_ptr;
 			wait.state = STATE_NONE;
 			ret = wq_sleep(info, SEND, timeout, &wait);
+		}
 		if (ret < 0)
 			free_msg(msg_ptr);
-		}
 	} else {
 		receiver = wq_get_first_waiter(info, RECV);
 		if (receiver) {

kernel/printk.c

@@ -240,6 +240,7 @@ __setup("log_buf_len=", log_buf_len_setup);
  * 	7 -- Enable printk's to console
  *	8 -- Set level of messages printed to console
  *	9 -- Return number of unread characters in the log buffer
+ *     10 -- Return size of the log buffer
  */
 int do_syslog(int type, char __user * buf, int len)
 {
@@ -359,6 +360,9 @@ int do_syslog(int type, char __user * buf, int len)
 	case 9:		/* Number of chars in the log buffer */
 		error = log_end - log_start;
 		break;
+	case 10:	/* Size of the log buffer */
+		error = log_buf_len;
+		break;
 	default:
 		error = -EINVAL;
 		break;