x86, asm: Use CC_SET()/CC_OUT() and static_cpu_has() in archrandom.h

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Use CC_SET()/CC_OUT() and static_cpu_has().  This produces code good
enough to eliminate ad hoc use of alternatives in <asm/archrandom.h>,
greatly simplifying the code.

While we are at it, make x86_init_rdrand() compile out completely if
we don't need it.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1465414726-197858-11-git-send-email-hpa@linux.intel.com

v2: fix a conflict between <linux/random.h> and <asm/archrandom.h>
    discovered by Ingo Molnar.  There are a few places in x86-specific
    code where we need all of <arch/archrandom.h> even when
    CONFIG_ARCH_RANDOM is disabled, so <linux/random.h> does not
    suffice.

...

This commit is contained in:

H. Peter Anvin 2016-06-08 12:38:46 -07:00

parent 66928b4eb9

commit 3b29039863

2 changed files with 62 additions and 70 deletions

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128

arch/x86/include/asm/archrandom.h

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4

arch/x86/kernel/cpu/rdrand.c

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