Hi Theodore,
Today's linux-next merge of the random tree got a conflict in
arch/x86/include/asm/archrandom.h between commit 5bfce5ef55cb ("x86,
kaslr: Provide randomness functions") from Linus' tree and commits
e3be36e60bdc ("x86, random: Enable the RDSEED instruction") and
91a60dc7aa88 ("random: Add arch_has_random[_seed]()") from the random tree.
I fixed it up (see below) and can carry the fix as necessary (no action
is required).
--
Cheers,
Stephen Rothwell sfr@xxxxxxxxxxxxxxxx
diff --cc arch/x86/include/asm/archrandom.h
index e6a92455740e,c7ed4a61e928..000000000000
--- a/arch/x86/include/asm/archrandom.h
+++ b/arch/x86/include/asm/archrandom.h
@@@ -39,20 -42,16 +42,30 @@@
#ifdef CONFIG_ARCH_RANDOM
+/* Instead of arch_get_random_long() when alternatives haven't run. */
+static inline int rdrand_long(unsigned long *v)
+{
+ int ok;
+ asm volatile("1: " RDRAND_LONG "\n\t"
+ "jc 2f\n\t"
+ "decl %0\n\t"
+ "jnz 1b\n\t"
+ "2:"
+ : "=r" (ok), "=a" (*v)
+ : "0" (RDRAND_RETRY_LOOPS));
+ return ok;
+}
+
+ /* A single attempt at RDSEED */
+ static inline bool rdseed_long(unsigned long *v)
+ {
+ unsigned char ok;
+ asm volatile(RDSEED_LONG "\n\t"
+ "setc %0"
+ : "=qm" (ok), "=a" (*v));
+ return ok;
+ }
+
#define GET_RANDOM(name, type, rdrand, nop) \
static inline int name(type *v) \
{ \
@@@ -80,15 -95,14 +109,21 @@@ GET_SEED(arch_get_random_seed_int, unsi
GET_RANDOM(arch_get_random_long, unsigned long, RDRAND_LONG, ASM_NOP3);
GET_RANDOM(arch_get_random_int, unsigned int, RDRAND_INT, ASM_NOP3);
+ GET_SEED(arch_get_random_seed_long, unsigned long, RDSEED_LONG, ASM_NOP4);
+ 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)
+{
+ return 0;
+}
+
#endif /* CONFIG_ARCH_RANDOM */
extern void x86_init_rdrand(struct cpuinfo_x86 *c);
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