[PATCH 2/5] objtool: More consistent use of arch_callee_saved_reg()

[Peter Zijlstra]

Since save_regs() will only ever set a reg when it is
arch_callee_saved_reg() all the other regs will always be unused and
are effectively scratch space.

No point in comparing them.

Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
---
 tools/objtool/check.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1725,6 +1725,9 @@ static bool has_modified_stack_frame(str
                return false;
 
        for (i = 0; i < CFI_NUM_REGS; i++) {
+               if (!arch_callee_saved_reg(i))
+                       continue;
+
                if (cfi->regs[i].base != initial_func_cfi.regs[i].base ||
                    cfi->regs[i].offset != initial_func_cfi.regs[i].offset)
                        return true;
@@ -2248,6 +2251,9 @@ static bool insn_cfi_match(struct instru
 
        } else if (memcmp(&cfi1->regs, &cfi2->regs, sizeof(cfi1->regs))) {
                for (i = 0; i < CFI_NUM_REGS; i++) {
+                       if (!arch_callee_saved_reg(i))
+                               continue;
+
                        if (!memcmp(&cfi1->regs[i], &cfi2->regs[i],
                                    sizeof(struct cfi_reg)))
                                continue;