| From | Sergei Zviagintsev <> | Subject | [PATCH 15/44] kdbus: Simplify bitwise expression in kdbus_meta_get_mask() | Date | Thu, 8 Oct 2015 14:31:44 +0300 |
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Replace the expression with more concise and readable equivalent. It can be proven by opening parentheses:
r & ~((p | i) & r) == r & (~(p | i) | ~r) == (r & ~(p | i)) | (r & ~r) == r & ~(p | i) == r & ~p & ~i
Signed-off-by: Sergei Zviagintsev <sergei@s15v.net> --- ipc/kdbus/metadata.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/ipc/kdbus/metadata.c b/ipc/kdbus/metadata.c index 788b4d9c7ecb..61215a078359 100644 --- a/ipc/kdbus/metadata.c +++ b/ipc/kdbus/metadata.c @@ -1321,7 +1321,7 @@ static u64 kdbus_meta_get_mask(struct pid *prv_pid, u64 prv_mask, * the sender, but still requested by the receiver. If any are left, * perform rather expensive /proc access checks for them. */ - missing = req_mask & ~((prv_mask | impl_mask) & req_mask); + missing = req_mask & ~prv_mask & ~impl_mask; if (missing) proc_mask = kdbus_meta_proc_mask(prv_pid, req_pid, req_cred, missing); -- 1.8.3.1
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