From: Jiping Ma <jiping....@windriver.com>
arch/arm64/kernel/perf_callchain.c:107:6: warning: cast from
pointer to integer of different size [-Wpointer-to-int-cast]
if ((u32)tail + 4 >= buftail.fp)
^
arch/arm64/kernel/perf_callchain.c:110:9: warning: cast to
pointer from integer of different size [-Wint-to-pointer-cast]
return (struct compat_frame_tail __user *)(buftail.fp - 4);
^
Signed-off-by: Jiping Ma <jiping....@windriver.com>
---
arch/arm64/kernel/perf_callchain.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kernel/perf_callchain.c
b/arch/arm64/kernel/perf_callchain.c
index 1be96e3631ea..b00408445674 100644
--- a/arch/arm64/kernel/perf_callchain.c
+++ b/arch/arm64/kernel/perf_callchain.c
@@ -97,10 +97,11 @@ compat_user_backtrace(struct compat_frame_tail __user *tail,
* Frame pointers should strictly progress back up the stack
* (towards higher addresses).
*/
- if ((u32)tail + 4 >= buftail.fp)
+ if ((u32)(u64)tail + 4 >= buftail.fp)
return NULL;
- return (struct compat_frame_tail __user *)(buftail.fp - 4);
+
+ return (struct compat_frame_tail __user *)((u64)buftail.fp - 4);
}
#endif /* CONFIG_COMPAT */
--
2.18.2
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