From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit cdd77e87eae52b7251acc5990207a1c4500a84ce 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@xxxxxxxxxx
Cc: rusty@xxxxxxxxxxxxxxx
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
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 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
--
2.9.3
--
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