Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

Pull x86 PTI fixes from Ingo Molnar:
 "Two fixes: a relatively simple objtool fix that makes Clang built
  kernels work with ORC debug info, plus an alternatives macro fix"

* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/alternatives: Fixup alternative_call_2
  objtool: Add Clang support

diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h
index cf5961c..4cd6a3b 100644 (file)
--- a/arch/x86/include/asm/alternative.h
+++ b/arch/x86/include/asm/alternative.h
@@ -218,13 +218,11 @@ static inline int alternatives_text_reserved(void *start, void *end)
  */
 #define alternative_call_2(oldfunc, newfunc1, feature1, newfunc2, feature2,   \
                           output, input...)                                  \
-{                                                                            \
        asm volatile (ALTERNATIVE_2("call %P[old]", "call %P[new1]", feature1,\
                "call %P[new2]", feature2)                                    \
                : output, ASM_CALL_CONSTRAINT                                 \
                : [old] "i" (oldfunc), [new1] "i" (newfunc1),                 \
-                 [new2] "i" (newfunc2), ## input);                           \
-}
+                 [new2] "i" (newfunc2), ## input)
 
 /*
  * use this macro(s) if you need more than one output parameter

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 92b6a2c..5409f6f 100644 (file)
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1386,6 +1386,17 @@ static int update_insn_state(struct instruction *insn, struct insn_state *state)
                                state->vals[op->dest.reg].offset = -state->stack_size;
                        }
 
+                       else if (op->src.reg == CFI_BP && op->dest.reg == CFI_SP &&
+                                cfa->base == CFI_BP) {
+
+                               /*
+                                * mov %rbp, %rsp
+                                *
+                                * Restore the original stack pointer (Clang).
+                                */
+                               state->stack_size = -state->regs[CFI_BP].offset;
+                       }
+
                        else if (op->dest.reg == cfa->base) {
 
                                /* mov %reg, %rsp */