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| author | H. Peter Anvin | 2014-03-18 00:36:30 +0100 |
|---|---|---|
| committer | Theodore Ts'o | 2014-03-20 03:24:08 +0100 |
| commit | 7b878d4b48c4e04b936918bb83836a107ba453b3 (patch) | |
| tree | 83df1d702e0162dc7785730356d934b8d59c45e2 /arch/x86/include/asm/archrandom.h | |
| parent | random: If we have arch_get_random_seed*(), try it before blocking (diff) | |
| download | kernel-qcow2-linux-7b878d4b48c4e04b936918bb83836a107ba453b3.tar.gz kernel-qcow2-linux-7b878d4b48c4e04b936918bb83836a107ba453b3.tar.xz kernel-qcow2-linux-7b878d4b48c4e04b936918bb83836a107ba453b3.zip | |
random: Add arch_has_random[_seed]()
Add predicate functions for having arch_get_random[_seed]*(). The
only current use is to avoid the loop in arch_random_refill() when
arch_get_random_seed_long() is unavailable.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'arch/x86/include/asm/archrandom.h')
| -rw-r--r-- | arch/x86/include/asm/archrandom.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/archrandom.h b/arch/x86/include/asm/archrandom.h index 6ad7f6d3f97f..69f1366f1aa3 100644 --- a/arch/x86/include/asm/archrandom.h +++ b/arch/x86/include/asm/archrandom.h @@ -114,6 +114,9 @@ GET_SEED(arch_get_random_seed_int, unsigned int, RDSEED_INT, ASM_NOP4); #endif /* CONFIG_X86_64 */ +#define arch_has_random() static_cpu_has(X86_FEATURE_RDRAND) +#define arch_has_random_seed() static_cpu_has(X86_FEATURE_RDSEED) + #else static inline int rdrand_long(unsigned long *v) |