Re: [patch] Re: using long instead of atomic_t when only set/read is required

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From: Alan Stern
Date: Monday, March 3, 2008 - 10:11 am

On Mon, 3 Mar 2008, Alan Cox wrote:


Miscommunication and lack of clarity.  CPU reads and writes _are_ 
guaranteed to be atomic.  What is not guaranteed is that the compiler 
will generate a single read or write instruction corresponding to a 
particular expression in C.

Consider a routine like the following:

	static task_struct *the_task;

	void store_task(void)
	{
		the_task = current;
	}

Is it possible to say whether readers examining "the_task" are 
guaranteed to see a coherent value?

Alan Stern		

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Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Wed Feb 20, 1:58 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Wed Feb 20, 3:15 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Wed Feb 20, 3:41 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Wed Feb 20, 5:02 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Thu Feb 21, 9:38 am)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Thu Feb 21, 3:47 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Fri Feb 22, 6:30 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Sat Feb 23, 1:16 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Sat Feb 23, 5:19 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Sun Feb 24, 6:33 am)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Sun Feb 24, 6:51 am)
Re: [linux-pm] [Bug 10030] Suspend doesn't work when SD ca ..., Rafael J. Wysocki, (Sun Feb 24, 7:00 am)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Sun Feb 24, 1:09 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Sun Feb 24, 1:25 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Sun Feb 24, 1:56 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Sun Feb 24, 3:18 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Sun Feb 24, 3:21 pm)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Mon Feb 25, 4:40 am)
Re: [Bug 10030] Suspend doesn't work when SD card is inserted, Rafael J. Wysocki, (Mon Feb 25, 4:41 am)
Re: [patch] Re: using long instead of atomic_t when only s ..., Alan Stern, (Mon Mar 3, 10:11 am)