vhost net module wants to do copy to/from user from a kernel thread, which needs switch_mm (like what fs/aio has). export cpu_tlbstate to make this possible Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- arch/x86/mm/tlb.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c index 821e970..e33a5f0 100644 --- a/arch/x86/mm/tlb.c +++ b/arch/x86/mm/tlb.c @@ -13,6 +13,7 @@ DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate) = { &init_mm, 0, }; +EXPORT_PER_CPU_SYMBOL_GPL(cpu_tlbstate); /* * Smarter SMP flushing macros. -- 1.6.2.5
On 08/10/2009 11:53 AM, Michael S. Tsirkin wrote:> vhost net module wants to do copy to/from user from a kernel thread, > which needs switch_mm (like what fs/aio has). > export cpu_tlbstate to make this possible > > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> > --- > arch/x86/mm/tlb.c | 1 + > 1 files changed, 1 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c > index 821e970..e33a5f0 100644 > --- a/arch/x86/mm/tlb.c > +++ b/arch/x86/mm/tlb.c > @@ -13,6 +13,7 @@ > > DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate) > = { &init_mm, 0, }; > +EXPORT_PER_CPU_SYMBOL_GPL(cpu_tlbstate); > > /* > * Smarter SMP flushing macros.Wouldn't it be a *lot* better to move use_mm() from fs/aio.c into common code, and export that instead? -hpa
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