[PATCH 4/8] selftests: x86: fsgsbase_restore: fix asm directive from =rm to =r

From: Muhammad Usama Anjum
Date: Wed May 01 2024 - 08:30:24 EST


The clang gives unknown use of instruction mnemonic error. Fix it by
specifying =r only. The operand would be placed in register only.

fsgsbase_restore.c:45:16: error: unknown use of instruction mnemonic without a size suffix
45 | asm volatile ("mov %" SEG ":(0), %0" : "=rm" (ret));
| ^
<inline asm>:1:2: note: instantiated into assembly here
1 | mov %fs:(0), 20(%esp)
| ^
fsgsbase_restore.c:45:16: error: unknown use of instruction mnemonic without a size suffix
45 | asm volatile ("mov %" SEG ":(0), %0" : "=rm" (ret));
| ^
<inline asm>:1:2: note: instantiated into assembly here
1 | mov %fs:(0), 20(%esp)
| ^

Signed-off-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>
---
tools/testing/selftests/x86/fsgsbase_restore.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/x86/fsgsbase_restore.c b/tools/testing/selftests/x86/fsgsbase_restore.c
index 6fffadc515791..12871b482185b 100644
--- a/tools/testing/selftests/x86/fsgsbase_restore.c
+++ b/tools/testing/selftests/x86/fsgsbase_restore.c
@@ -42,7 +42,7 @@
static unsigned int dereference_seg_base(void)
{
int ret;
- asm volatile ("mov %" SEG ":(0), %0" : "=rm" (ret));
+ asm volatile ("mov %" SEG ":(0), %0" : "=r" (ret));
return ret;
}

--
2.39.2