[Lcd4linux-devel] rdtscl() on i386

[Bernhard W. <ber...@gm...>]

Hello,

following kernel commit has removed rdtcl() from being exported in
userspace. It’s now inside __KERNEL__ ifdef.

    commit 4bc5aa91fb1e544ad37805520030a0d9fc6e11d3
    Author: H. Peter Anvin <hp...@zy...>
    Date:   Wed May 2 19:27:12 2007 +0200

    [PATCH] x86: Clean up x86 control register and MSR macros (corrected)

    This patch is based on Rusty's recent cleanup of the EFLAGS-related
    macros; it extends the same kind of cleanup to control registers and
    MSRs.

    It also unifies these between i386 and x86-64; at least with regards
    to MSRs, the two had definitely gotten out of sync.

    Signed-off-by: H. Peter Anvin <hp...@zy...>
    Signed-off-by: Andi Kleen <ak...@su...>


Therefore, checking if <asm/msr.h> exists is not sufficient any more. rdtscl()
is also problematic on multi-core systems. I guess it's time to get rid of
rdtscl() ...



Thanks,
   Bernhard