[PATCH tip/core/rcu 15/21] keyring: Remove now-redundant smp_read_barrier_depends()
From: Paul E. McKenney <hidden>
Date: 2017-12-01 19:55:00
Also in:
keyrings, lkml
Subsystem:
keys/keyrings, security subsystem, the rest · Maintainers:
David Howells, Jarkko Sakkinen, Paul Moore, James Morris, "Serge E. Hallyn", Linus Torvalds
Now that the associative-array library properly heads dependency chains, the various smp_read_barrier_depends() calls in security/keys/keyring.c are no longer needed. This commit therefore removes them. Signed-off-by: Paul E. McKenney <redacted> Cc: David Howells <dhowells@redhat.com> Cc: James Morris <redacted> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: <redacted> Cc: <redacted> --- security/keys/keyring.c | 7 ------- 1 file changed, 7 deletions(-)
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
index d0bccebbd3b5..41bcf57e96f2 100644
--- a/security/keys/keyring.c
+++ b/security/keys/keyring.c@@ -713,7 +713,6 @@ static bool search_nested_keyrings(struct key *keyring, * doesn't contain any keyring pointers. */ shortcut = assoc_array_ptr_to_shortcut(ptr); - smp_read_barrier_depends(); if ((shortcut->index_key[0] & ASSOC_ARRAY_FAN_MASK) != 0) goto not_this_keyring;
@@ -723,8 +722,6 @@ static bool search_nested_keyrings(struct key *keyring, } node = assoc_array_ptr_to_node(ptr); - smp_read_barrier_depends(); - ptr = node->slots[0]; if (!assoc_array_ptr_is_meta(ptr)) goto begin_node;
@@ -736,7 +733,6 @@ static bool search_nested_keyrings(struct key *keyring, kdebug("descend"); if (assoc_array_ptr_is_shortcut(ptr)) { shortcut = assoc_array_ptr_to_shortcut(ptr); - smp_read_barrier_depends(); ptr = READ_ONCE(shortcut->next_node); BUG_ON(!assoc_array_ptr_is_node(ptr)); }
@@ -744,7 +740,6 @@ static bool search_nested_keyrings(struct key *keyring, begin_node: kdebug("begin_node"); - smp_read_barrier_depends(); slot = 0; ascend_to_node: /* Go through the slots in a node */
@@ -792,14 +787,12 @@ static bool search_nested_keyrings(struct key *keyring, if (ptr && assoc_array_ptr_is_shortcut(ptr)) { shortcut = assoc_array_ptr_to_shortcut(ptr); - smp_read_barrier_depends(); ptr = READ_ONCE(shortcut->back_pointer); slot = shortcut->parent_slot; } if (!ptr) goto not_this_keyring; node = assoc_array_ptr_to_node(ptr); - smp_read_barrier_depends(); slot++; /* If we've ascended to the root (zero backpointer), we must have just
--
2.5.2
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