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m68k: Add infrastructure for machine-specific random_get_entropy()

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On m68k, get_cycles() (the default implementation for random_get_entropy())
always returns zero, providing no entropy for the random driver.

Add a hook where platforms can provide their own implementation, and wire
it up in the infrastructure provided by commit
61875f30da ("random: allow architectures to
optionally define random_get_entropy()").

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Geert Uytterhoeven 2013-10-18 13:10:08 +02:00
parent 7a15dd5c4b
commit 017cecee99
2 changed files with 14 additions and 0 deletions
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10
arch/m68k/include/asm/timex.h
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@ -28,4 +28,14 @@ static inline cycles_t get_cycles(void)
return 0; return 0;
} }
extern unsigned long (*mach_random_get_entropy)(void);
static inline unsigned long random_get_entropy(void)
{
if (mach_random_get_entropy)
return mach_random_get_entropy();
return 0;
}
#define random_get_entropy random_get_entropy
#endif #endif

4
arch/m68k/kernel/time.c
View file

@ -28,6 +28,10 @@
#include <linux/timex.h> #include <linux/timex.h>
#include <linux/profile.h> #include <linux/profile.h>
unsigned long (*mach_random_get_entropy)(void);
/* /*
* timer_interrupt() needs to keep up the real-time clock, * timer_interrupt() needs to keep up the real-time clock,
* as well as call the "xtime_update()" routine every clocktick * as well as call the "xtime_update()" routine every clocktick