[PATCH v4 04/16] powerpc: Curb objtool unannotated intra-function warnings

Sathvika Vasireddy
2022-10-02T10:44:31Z

objtool throws the following unannotated intra-function call warnings:
arch/powerpc/kernel/entry_64.o: warning: objtool: .text+0x4: unannotated intra-function call
arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0xe64: unannotated intra-function call
arch/powerpc/kvm/book3s_hv_rmhandlers.o: warning: objtool: .text+0xee4: unannotated intra-function call

Fix these warnings by annotating intra-function calls, using
ANNOTATE_INTRA_FUNCTION_CALL macro, to indicate that the branch targets
are valid.

Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Sathvika Vasireddy <sv@linux.ibm.com>
---
arch/powerpc/kernel/entry_64.S | 2 ++
arch/powerpc/kvm/book3s_hv_rmhandlers.S | 3 +++
2 files changed, 5 insertions(+)

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 01ace4c56104..fb444bc64f3f 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -14,6 +14,7 @@
* code, and exception/interrupt return code for PowerPC.
*/

+#include <linux/objtool.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <asm/cache.h>
@@ -73,6 +74,7 @@ flush_branch_caches:

// Flush the link stack
.rept 64
+ ANNOTATE_INTRA_FUNCTION_CALL
bl .+4
.endr
b 1f
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index bc187bb216ac..20212eb30764 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -11,6 +11,7 @@
*/

#include <linux/linkage.h>
+#include <linux/objtool.h>
#include <asm/ppc_asm.h>
#include <asm/code-patching-asm.h>
#include <asm/kvm_asm.h>
@@ -1523,12 +1524,14 @@ kvm_flush_link_stack:

/* Flush the link stack. On Power8 it's up to 32 entries in size. */
.rept 32
+ ANNOTATE_INTRA_FUNCTION_CALL
bl .+4
.endr

/* And on Power9 it's up to 64. */
BEGIN_FTR_SECTION
.rept 32
+ ANNOTATE_INTRA_FUNCTION_CALL
bl .+4
.endr
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
--
2.31.1