Revision 9aea5a65aa7a1af9a4236dfaeb0088f1624f9919 authored by Roland McGrath on 08 September 2010, 02:37:06 UTC, committed by Linus Torvalds on 10 September 2010, 15:10:26 UTC
An execve with a very large total of argument/environment strings can take a really long time in the execve system call. It runs uninterruptibly to count and copy all the strings. This change makes it abort the exec quickly if sent a SIGKILL. Note that this is the conservative change, to interrupt only for SIGKILL, by using fatal_signal_pending(). It would be perfectly correct semantics to let any signal interrupt the string-copying in execve, i.e. use signal_pending() instead of fatal_signal_pending(). We'll save that change for later, since it could have user-visible consequences, such as having a timer set too quickly make it so that an execve can never complete, though it always happened to work before. Signed-off-by: Roland McGrath <roland@redhat.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 7993bc1
samsung.h
/* linux/drivers/serial/samsung.h
*
* Driver for Samsung SoC onboard UARTs.
*
* Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
* http://armlinux.simtec.co.uk/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
struct s3c24xx_uart_info {
char *name;
unsigned int type;
unsigned int fifosize;
unsigned long rx_fifomask;
unsigned long rx_fifoshift;
unsigned long rx_fifofull;
unsigned long tx_fifomask;
unsigned long tx_fifoshift;
unsigned long tx_fifofull;
/* uart port features */
unsigned int has_divslot:1;
/* clock source control */
int (*get_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
int (*set_clksrc)(struct uart_port *, struct s3c24xx_uart_clksrc *clk);
/* uart controls */
int (*reset_port)(struct uart_port *, struct s3c2410_uartcfg *);
};
struct s3c24xx_uart_port {
unsigned char rx_claimed;
unsigned char tx_claimed;
unsigned int pm_level;
unsigned long baudclk_rate;
unsigned int rx_irq;
unsigned int tx_irq;
struct s3c24xx_uart_info *info;
struct s3c24xx_uart_clksrc *clksrc;
struct clk *clk;
struct clk *baudclk;
struct uart_port port;
#ifdef CONFIG_CPU_FREQ
struct notifier_block freq_transition;
#endif
};
/* conversion functions */
#define s3c24xx_dev_to_port(__dev) (struct uart_port *)dev_get_drvdata(__dev)
#define s3c24xx_dev_to_cfg(__dev) (struct s3c2410_uartcfg *)((__dev)->platform_data)
/* register access controls */
#define portaddr(port, reg) ((port)->membase + (reg))
#define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
#define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))
#define wr_regb(port, reg, val) __raw_writeb(val, portaddr(port, reg))
#define wr_regl(port, reg, val) __raw_writel(val, portaddr(port, reg))
extern int s3c24xx_serial_probe(struct platform_device *dev,
struct s3c24xx_uart_info *uart);
extern int __devexit s3c24xx_serial_remove(struct platform_device *dev);
extern int s3c24xx_serial_initconsole(struct platform_driver *drv,
struct s3c24xx_uart_info **uart);
extern int s3c24xx_serial_init(struct platform_driver *drv,
struct s3c24xx_uart_info *info);
#ifdef CONFIG_SERIAL_SAMSUNG_CONSOLE
#define s3c24xx_console_init(__drv, __inf) \
static int __init s3c_serial_console_init(void) \
{ \
struct s3c24xx_uart_info *uinfo[CONFIG_SERIAL_SAMSUNG_UARTS]; \
int i; \
\
for (i = 0; i < CONFIG_SERIAL_SAMSUNG_UARTS; i++) \
uinfo[i] = __inf; \
return s3c24xx_serial_initconsole(__drv, uinfo); \
} \
\
console_initcall(s3c_serial_console_init)
#else
#define s3c24xx_console_init(drv, inf) extern void no_console(void)
#endif
#ifdef CONFIG_SERIAL_SAMSUNG_DEBUG
extern void printascii(const char *);
static void dbg(const char *fmt, ...)
{
va_list va;
char buff[256];
va_start(va, fmt);
vsprintf(buff, fmt, va);
va_end(va);
printascii(buff);
}
#else
#define dbg(x...) do { } while (0)
#endif
Computing file changes ...
