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

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>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
index 516923926335..922a1acbf652 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