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Revert "objtool: Support addition to set CFA base" 

[ Upstream commit e18398e80c ]

Commit 468af56a7b ("objtool: Support addition to set CFA base") was
added as a preparatory patch for arm64 support, but that support never
came.  It triggers a false positive warning on x86, so just revert it
for now.

Fixes the following warning:

  vmlinux.o: warning: objtool: cdce925_regmap_i2c_write+0xdb: stack state mismatch: cfa1=4+120 cfa2=5+40

Fixes: 468af56a7b ("objtool: Support addition to set CFA base")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/oe-kbuild-all/202304080538.j5G6h1AB-lkp@intel.com/
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Josh Poimboeuf 2023-04-12 10:29:01 -07:00 committed by Greg Kroah-Hartman
parent 2d44928903
commit e38f070a57
1 changed files with 0 additions and 11 deletions
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11
tools/objtool/check.c
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@ -2757,17 +2757,6 @@ static int update_cfi_state(struct instruction *insn,
break; break;
} }
if (!cfi->drap && op->src.reg == CFI_SP &&
op->dest.reg == CFI_BP && cfa->base == CFI_SP &&
check_reg_frame_pos(&regs[CFI_BP], -cfa->offset + op->src.offset)) {
/* lea disp(%rsp), %rbp */
cfa->base = CFI_BP;
cfa->offset -= op->src.offset;
cfi->bp_scratch = false;
break;
}
if (op->src.reg == CFI_SP && cfa->base == CFI_SP) { if (op->src.reg == CFI_SP && cfa->base == CFI_SP) {
/* drap: lea disp(%rsp), %drap */ /* drap: lea disp(%rsp), %drap */