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Message-ID: <AANLkTim7R3rNj0YdsTynQJUnk0crXRuAg2CHHqe1vttA@mail.gmail.com> Date: Sat, 17 Jul 2010 19:14:38 +0300 From: Pekka Enberg <penberg@...helsinki.fi> To: Brian Gerst <brgerst@...il.com> Cc: hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 3/3] x86-64: Simplify loading initial_gs On Sat, Jul 17, 2010 at 4:03 PM, Brian Gerst <brgerst@...il.com> wrote: > Load initial_gs as two 32-bit values instead of splitting a 64-bit value. > > Signed-off-by: Brian Gerst <brgerst@...il.com> > --- > arch/x86/kernel/head_64.S | 5 ++--- > 1 files changed, 2 insertions(+), 3 deletions(-) > > diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S > index 3d1e6f1..239046b 100644 > --- a/arch/x86/kernel/head_64.S > +++ b/arch/x86/kernel/head_64.S > @@ -234,9 +234,8 @@ ENTRY(secondary_startup_64) > * init data section till per cpu areas are set up. > */ > movl $MSR_GS_BASE,%ecx > - movq initial_gs(%rip),%rax > - movq %rax,%rdx > - shrq $32,%rdx > + movl initial_gs(%rip),%eax > + movl initial_gs+4(%rip),%edx > wrmsr > > /* esi is pointer to real mode structure with interesting info. Reviewed-by: Pekka Enberg <penberg@...helsinki.fi> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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