x86/kvm: Resolve shadow warnings in macro expansion

Resolve shadow warnings that appear in W=2 builds. Instead of
using ret to hold the return pointer, save the length in a new
variable saved_len and compute the pointer on exit. This also
resolves a very technical error, in that ret was declared as
a const char *, when it really was a char * const.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
index 9d2e0ff..5aaf356 100644 (file)
--- a/arch/x86/kvm/mmutrace.h
+++ b/arch/x86/kvm/mmutrace.h
@@ -22,7 +22,7 @@
        __entry->unsync = sp->unsync;
 
 #define KVM_MMU_PAGE_PRINTK() ({                                       \
-       const char *ret = p->buffer + p->len;                           \
+       const u32 saved_len = p->len;                                   \
        static const char *access_str[] = {                             \
                "---", "--x", "w--", "w-x", "-u-", "-ux", "wu-", "wux"  \
        };                                                              \
@@ -41,7 +41,7 @@
                         role.nxe ? "" : "!",                           \
                         __entry->root_count,                           \
                         __entry->unsync ? "unsync" : "sync", 0);       \
-       ret;                                                            \
+       p->buffer + saved_len;                                          \
                })
 
 #define kvm_mmu_trace_pferr_flags       \