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x86, asmlinkage, lguest: Pass in globals into assembler statement

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commit cdd77e87ea upstream.

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: x86@kernel.org
Cc: rusty@rustcorp.com.au
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
This commit is contained in:
Andi Kleen 2013-11-05 21:22:28 +10:30 committed by Jiri Slaby
parent 0208cd5282
commit 2d7bf05eff
1 changed files with 4 additions and 2 deletions
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6
drivers/lguest/x86/core.c
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@ -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