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| author | Matthias Kaehlcke <mka@chromium.org> | 2019-06-19 00:14:40 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-06-20 00:29:38 +0300 |
| commit | 25cec756891e8733433efea63b2254ddc93aa5cc (patch) | |
| tree | 0b64e73061a7d708b1fc8946cb912c24613586a0 /net/ipv4/fib_trie.c | |
| parent | 16e5a266f51639492ac30761d043525d7d43f4c8 (diff) | |
| download | linux-25cec756891e8733433efea63b2254ddc93aa5cc.tar.xz | |
net/ipv4: fib_trie: Avoid cryptic ternary expressions
empty_child_inc/dec() use the ternary operator for conditional
operations. The conditions involve the post/pre in/decrement
operator and the operation is only performed when the condition
is *not* true. This is hard to parse for humans, use a regular
'if' construct instead and perform the in/decrement separately.
This also fixes two warnings that are emitted about the value
of the ternary expression being unused, when building the kernel
with clang + "kbuild: Remove unnecessary -Wno-unused-value"
(https://lore.kernel.org/patchwork/patch/1089869/):
CC net/ipv4/fib_trie.o
net/ipv4/fib_trie.c:351:2: error: expression result unused [-Werror,-Wunused-value]
++tn_info(n)->empty_children ? : ++tn_info(n)->full_children;
Fixes: 95f60ea3e99a ("fib_trie: Add collapse() and should_collapse() to resize")
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_trie.c')
| -rw-r--r-- | net/ipv4/fib_trie.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c index 94e5d83db4db..90f0fc8c87bd 100644 --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -338,12 +338,18 @@ static struct tnode *tnode_alloc(int bits) static inline void empty_child_inc(struct key_vector *n) { - ++tn_info(n)->empty_children ? : ++tn_info(n)->full_children; + tn_info(n)->empty_children++; + + if (!tn_info(n)->empty_children) + tn_info(n)->full_children++; } static inline void empty_child_dec(struct key_vector *n) { - tn_info(n)->empty_children-- ? : tn_info(n)->full_children--; + if (!tn_info(n)->empty_children) + tn_info(n)->full_children--; + + tn_info(n)->empty_children--; } static struct key_vector *leaf_new(t_key key, struct fib_alias *fa) |