mirror of
https://github.com/Fishwaldo/Star64_linux.git
synced 2025-03-16 12:14:06 +00:00
x86/tsc: Use fallback for random_get_entropy() instead of zero
commit 3bd4abc07a
upstream.
In the event that random_get_entropy() can't access a cycle counter or
similar, falling back to returning 0 is suboptimal. Instead, fallback
to calling random_get_entropy_fallback(), which isn't extremely high
precision or guaranteed to be entropic, but is certainly better than
returning zero all the time.
If CONFIG_X86_TSC=n, then it's possible for the kernel to run on systems
without RDTSC, such as 486 and certain 586, so the fallback code is only
required for that case.
As well, fix up both the new function and the get_cycles() function from
which it was derived to use cpu_feature_enabled() rather than
boot_cpu_has(), and use !IS_ENABLED() instead of #ifndef.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: x86@kernel.org
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
b7e6ebd290
commit
43e546ef79
2 changed files with 12 additions and 4 deletions
|
@ -5,6 +5,15 @@
|
|||
#include <asm/processor.h>
|
||||
#include <asm/tsc.h>
|
||||
|
||||
static inline unsigned long random_get_entropy(void)
|
||||
{
|
||||
if (!IS_ENABLED(CONFIG_X86_TSC) &&
|
||||
!cpu_feature_enabled(X86_FEATURE_TSC))
|
||||
return random_get_entropy_fallback();
|
||||
return rdtsc();
|
||||
}
|
||||
#define random_get_entropy random_get_entropy
|
||||
|
||||
/* Assume we use the PIT time source for the clock tick */
|
||||
#define CLOCK_TICK_RATE PIT_TICK_RATE
|
||||
|
||||
|
|
|
@ -20,13 +20,12 @@ extern void disable_TSC(void);
|
|||
|
||||
static inline cycles_t get_cycles(void)
|
||||
{
|
||||
#ifndef CONFIG_X86_TSC
|
||||
if (!boot_cpu_has(X86_FEATURE_TSC))
|
||||
if (!IS_ENABLED(CONFIG_X86_TSC) &&
|
||||
!cpu_feature_enabled(X86_FEATURE_TSC))
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
return rdtsc();
|
||||
}
|
||||
#define get_cycles get_cycles
|
||||
|
||||
extern struct system_counterval_t convert_art_to_tsc(u64 art);
|
||||
extern struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns);
|
||||
|
|
Loading…
Add table
Reference in a new issue