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To: linux-tip-commits@vger.kernel.org
Subject: [tip: objtool/core] Revert "objtool: Support addition to set CFA
base"
Cc: kernel test robot <lkp@intel.com>,
Josh Poimboeuf <jpoimboe@kernel.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>, x86@kernel.org,
linux-kernel@vger.kernel.org
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[tip:,objtool/core] Revert "objtool: Support addition to set CFA base"
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Commit Message
tip-bot2 for Thomas Gleixner
April 14, 2023, 2:47 p.m. UTC
The following commit has been merged into the objtool/core branch of tip:
Commit-ID: e18398e80c73e3cc7d9c3d2e0bc06a4af8f4f1cb
Gitweb: https://git.kernel.org/tip/e18398e80c73e3cc7d9c3d2e0bc06a4af8f4f1cb
Author: Josh Poimboeuf <jpoimboe@kernel.org>
AuthorDate: Wed, 12 Apr 2023 10:29:01 -07:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Fri, 14 Apr 2023 16:08:27 +02:00
Revert "objtool: Support addition to set CFA base"
Commit 468af56a7bba ("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: 468af56a7bba ("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/
---
tools/objtool/check.c | 11 -----------
1 file changed, 11 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index cae6ac6..9440b07 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -3002,17 +3002,6 @@ static int update_cfi_state(struct instruction *insn, break; } - if (!cfi->drap && op->src.reg == CFI_SP && - op->dest.reg == CFI_BP && cfa->base == CFI_SP && - check_reg_frame_pos(®s[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) { /* drap: lea disp(%rsp), %drap */