3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Greg Kroah-Hartman <gre...@linuxfoundation.org>
This reverts commit 5b5b30580218eae22609989546bac6e44d0eda6e, which was
commit 660696d1d16a71e15549ce1bf74953be1592bcd3 upstream.
Paul Gortmaker <paul.gortma...@windriver.com> writes:
[this patch] introduces the following:
arch/x86/kvm/emulate.c: In function ‘decode_operand’:
arch/x86/kvm/emulate.c:3974:4: warning: passing argument 1 of ‘decode_register’
makes integer from pointer
+without a cast [enabled by default]
arch/x86/kvm/emulate.c:789:14: note: expected ‘u8’ but argument is of type
‘struct x86_emulate_ctxt *’
arch/x86/kvm/emulate.c:3974:4: warning: passing argument 2 of ‘decode_register’
makes pointer from integer
+without a cast [enabled by default]
arch/x86/kvm/emulate.c:789:14: note: expected ‘long unsigned int *’ but
argument is of type ‘u8’
Based on the severity of the warnings above, I'm reasonably sure there will
be some kind of runtime regressions due to this, but I stopped to investigate
the warnings as soon as I saw them, before any run time testing.
It happens because mainline v3.7-rc1~113^2~40 (dd856efafe60) does this:
-static void *decode_register(u8 modrm_reg, unsigned long *regs,
+static void *decode_register(struct x86_emulate_ctxt *ctxt, u8 modrm_reg,
Since 660696d1d16a71e1 was only applied to stable 3.4, 3.8, and 3.9 -- and
the prerequisite above is in 3.7+, the issue should be limited to 3.4.44+
Reported-by: Paul Gortmaker <paul.gortma...@windriver.com>
Acked-by: Paolo Bonzini <pbonz...@redhat.com>
Cc: Gleb Natapov <g...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/kvm/emulate.c | 4 ----
1 file changed, 4 deletions(-)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3737,10 +3737,6 @@ static int decode_operand(struct x86_emu
break;
case OpMem8:
ctxt->memop.bytes = 1;
- if (ctxt->memop.type == OP_REG) {
- ctxt->memop.addr.reg = decode_register(ctxt,
ctxt->modrm_rm, 1);
- fetch_register_operand(&ctxt->memop);
- }
goto mem_common;
case OpMem16:
ctxt->memop.bytes = 2;
--
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