PRINTK_TIMED_RATELIM(9) Driver Basics PRINTK_TIMED_RATELIM(9)NAME
printk_timed_ratelimit - caller-controlled printk ratelimiting
bool printk_timed_ratelimit(unsigned long * caller_jiffies, unsigned int interval_msecs);
pointer to caller's state
minimum interval between prints
printk_timed_ratelimit returns true if more than interval_msecs milliseconds have elapsed since the last time printk_timed_ratelimit
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 PRINTK_TIMED_RATELIM(9)
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MTRR_ADD(9) Hardware Interfaces MTRR_ADD(9)NAME
mtrr_add - Add a memory type region
int mtrr_add(unsigned long base, unsigned long size, unsigned int type, bool increment);
Physical base address of region
Physical size of region
Type of MTRR desired
If this is true do usage counting on the region
Memory type region registers control the caching on newer Intel and non Intel processors. This function allows drivers to request an MTRR
is added. The details and hardware specifics of each processor's implementation are hidden from the caller, but nevertheless the caller
should expect to need to provide a power of two size on an equivalent power of two boundary.
If the region cannot be added either because all regions are in use or the CPU cannot support it a negative value is returned. On success
the register number for this entry is returned, but should be treated as a cookie only.
On a multiprocessor machine the changes are made to all processors. This is required on x86 by the Intel processors.
The available types are
MTRR_TYPE_UNCACHABLE - No caching
MTRR_TYPE_WRBACK - Write data back in bursts whenever
MTRR_TYPE_WRCOMB - Write data back soon but allow bursts
MTRR_TYPE_WRTHROUGH - Cache reads but not writes
Needs a quiet flag for the cases where drivers do not mind failures and do not wish system log messages to be sent.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 MTRR_ADD(9)
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