Andi Kleen <a...@firstfloor.org> writes:
> From: Andi Kleen <a...@linux.intel.com>
>
> Tell the compiler that the inline assembler statement
> references lguest_entry.
>
> This fixes compile problems with LTO where the variable
> and the assembler code may end up in different files.
>
> Cc: x...@kernel.org
> Cc: ru...@rustcorp.com.au
> Signed-off-by: Andi Kleen <a...@linux.intel.com>
Great, thanks. Might as well keep this with the others:
Acked-by: Rusty Russell <ru...@rustcorp.com.au>
Tested-by: Rusty Russell <ru...@rustcorp.com.au>
Cheers,
Rusty.
> ---
> drivers/lguest/x86/core.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
> index 5169239..922a1ac 100644
> --- a/drivers/lguest/x86/core.c
> +++ b/drivers/lguest/x86/core.c
> @@ -157,7 +157,7 @@ static void run_guest_once(struct lg_cpu *cpu, struct
> lguest_pages *pages)
> * stack, then the address of this call. This stack layout happens to
> * exactly match the stack layout created by an interrupt...
> */
> - asm volatile("pushf; lcall *lguest_entry"
> + asm volatile("pushf; lcall *%4"
> /*
> * This is how we tell GCC that %eax ("a") and %ebx ("b")
> * are changed by this routine. The "=" means output.
> @@ -169,7 +169,9 @@ static void run_guest_once(struct lg_cpu *cpu, struct
> lguest_pages *pages)
> * physical address of the Guest's top-level page
> * directory.
> */
> - : "0"(pages),
> "1"(__pa(cpu->lg->pgdirs[cpu->cpu_pgd].pgdir))
> + : "0"(pages),
> + "1"(__pa(cpu->lg->pgdirs[cpu->cpu_pgd].pgdir)),
> + "m"(lguest_entry)
> /*
> * We tell gcc that all these registers could change,
> * which means we don't have to save and restore them in
> --
> 1.8.3.1
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