Messages in this thread | | | Date | Mon, 27 Nov 2017 22:00:16 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 10/24] x86/mm/kaiser: Map the entry stack variables |
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On Mon, Nov 27, 2017 at 06:32:11PM +0100, Thomas Gleixner wrote: > On Mon, 27 Nov 2017, Peter Zijlstra wrote: > > > On Mon, Nov 27, 2017 at 11:49:09AM +0100, Ingo Molnar wrote: > > > diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c > > > index 157f81816915..631e229ab428 100644 > > > --- a/arch/x86/kernel/process_64.c > > > +++ b/arch/x86/kernel/process_64.c > > > @@ -59,7 +59,7 @@ > > > #include <asm/unistd_32_ia32.h> > > > #endif > > > > > > -__visible DEFINE_PER_CPU(unsigned long, rsp_scratch); > > > +__visible DEFINE_PER_CPU_USER_MAPPED(unsigned long, rsp_scratch); > > > > > > /* Prints also some state that isn't saved in the pt_regs */ > > > void __show_regs(struct pt_regs *regs, int all) > > > > Do we still need this one? It appears to me we'll never actually execute > > that part of entry_SYSCALL_64 anymore, due to > > entry_SYSCALL_64_trampoline. > > Unless we use entry_SYSCALL_64 when kaiser is disabled at boottime
Right for which you need that patchlet I send earlier today. The patches as they are will never ever reach that code.
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