[PATCH v2 24/24] linux-user: Simplify target_madvise

[Richard Henderson <richard.henderson@linaro.org>]

The trivial length 0 check can be moved up, simplifying some
of the other cases.  The end < start test is handled by
guest_range_valid_untagged.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/mmap.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index a2bef1ebe6..48b83ca8bf 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -900,28 +900,17 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
 
 abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice)
 {
-    abi_ulong len, end;
+    abi_ulong len;
     int ret = 0;
 
     if (start & ~TARGET_PAGE_MASK) {
         return -TARGET_EINVAL;
     }
-    len = TARGET_PAGE_ALIGN(len_in);
-
-    if (len_in && !len) {
-        return -TARGET_EINVAL;
-    }
-
-    end = start + len;
-    if (end < start) {
-        return -TARGET_EINVAL;
-    }
-
-    if (end == start) {
+    if (len_in == 0) {
         return 0;
     }
-
-    if (!guest_range_valid_untagged(start, len)) {
+    len = TARGET_PAGE_ALIGN(len_in);
+    if (len == 0 || !guest_range_valid_untagged(start, len)) {
         return -TARGET_EINVAL;
     }
 
-- 
2.34.1