Series comparison

UBSAN complains:
runtime error: addition of unsigned offset to 0x7bc06e1f5000
overflowed to 0x7bc02e1f5000

Cast the pointer to unsigned integer to perform the arithmetic and
silence the error.

Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
 tcg/region.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/tcg/region.c b/tcg/region.c
index XXXXXXX..XXXXXXX 100644
--- a/tcg/region.c
+++ b/tcg/region.c
@@ -XXX,XX +XXX,XX @@ const void *tcg_splitwx_to_rx(void *rw)
     /* Pass NULL pointers unchanged. */
     if (rw) {
         g_assert(in_code_gen_buffer(rw));
-        rw += tcg_splitwx_diff;
+        rw = (void *)((uintptr_t)rw + tcg_splitwx_diff);
     }
     return rw;
 }
@@ -XXX,XX +XXX,XX @@ void *tcg_splitwx_to_rw(const void *rx)
 {
     /* Pass NULL pointers unchanged. */
     if (rx) {
-        rx -= tcg_splitwx_diff;
+        rx = (void *)((uintptr_t)rx - tcg_splitwx_diff);
         /* Assert that we end with a pointer in the rw region. */
         g_assert(in_code_gen_buffer(rx));
     }
@@ -XXX,XX +XXX,XX @@ static struct tcg_region_tree *tc_ptr_to_region_tree(const void *p)
      * a signal handler over which the caller has no control.
      */
     if (!in_code_gen_buffer(p)) {
-        p -= tcg_splitwx_diff;
+        p = (void *)((uintptr_t)p - tcg_splitwx_diff);
         if (!in_code_gen_buffer(p)) {
             return NULL;
         }
@@ -XXX,XX +XXX,XX @@ void tcg_region_init(size_t tb_size, int splitwx, unsigned max_threads)
     /* Request large pages for the buffer and the splitwx.  */
     qemu_madvise(region.start_aligned, region.total_size, QEMU_MADV_HUGEPAGE);
     if (tcg_splitwx_diff) {
-        qemu_madvise(region.start_aligned + tcg_splitwx_diff,
-                     region.total_size, QEMU_MADV_HUGEPAGE);
+        uintptr_t buf_rx = (uintptr_t)region.start_aligned + tcg_splitwx_diff;
+
+        qemu_madvise((void *)buf_rx, region.total_size, QEMU_MADV_HUGEPAGE);
     }
 
     /*
-- 
2.53.0

UBSAN complains:
runtime error: addition of unsigned offset to 0x7bc06e1f5000
overflowed to 0x7bc02e1f5000

Change tcg_splitwx_diff to ptrdiff_t and silence the error.

Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
 include/tcg/tcg.h | 2 +-
 tcg/tcg.c         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
index XXXXXXX..XXXXXXX 100644
--- a/include/tcg/tcg.h
+++ b/include/tcg/tcg.h
@@ -XXX,XX +XXX,XX @@ static inline bool temp_readonly(TCGTemp *ts)
 
 extern __thread TCGContext *tcg_ctx;
 extern const void *tcg_code_gen_epilogue;
-extern uintptr_t tcg_splitwx_diff;
+extern ptrdiff_t tcg_splitwx_diff;
 extern TCGv_env tcg_env;
 
 bool in_code_gen_buffer(const void *p);
diff --git a/tcg/tcg.c b/tcg/tcg.c
index XXXXXXX..XXXXXXX 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -XXX,XX +XXX,XX @@ unsigned int tcg_cur_ctxs;
 unsigned int tcg_max_ctxs;
 TCGv_env tcg_env;
 const void *tcg_code_gen_epilogue;
-uintptr_t tcg_splitwx_diff;
+ptrdiff_t tcg_splitwx_diff;
 
 #ifndef CONFIG_TCG_INTERPRETER
 tcg_prologue_fn *tcg_qemu_tb_exec;
-- 
2.53.0