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authorLinus Torvalds <torvalds@linux-foundation.org>2020-06-28 10:29:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-28 10:29:38 -0700
commitc141b30e9960e81455ad9c3658c079051eea7e2d (patch)
tree4940596fa19d57c32f2f88a3037780bdb6c17db6 /scripts
parent7ecb59a56666506ebb1197f89ca7d587bd83309e (diff)
parentb58e733fd774f3f4b49d9e7640d172a57e35200e (diff)
Merge tag 'rcu_urgent_for_5.8_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RCU-vs-KCSAN fixes from Borislav Petkov: "A single commit that uses "arch_" atomic operations to avoid the instrumentation that comes with the non-"arch_" versions. In preparation for that commit, it also has another commit that makes these "arch_" atomic operations available to generic code. Without these commits, KCSAN uses can see pointless errors" * tag 'rcu_urgent_for_5.8_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: rcu: Fixup noinstr warnings locking/atomics: Provide the arch_atomic_ interface to generic code
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/atomic/gen-atomic-fallback.sh31
1 files changed, 31 insertions, 0 deletions
diff --git a/scripts/atomic/gen-atomic-fallback.sh b/scripts/atomic/gen-atomic-fallback.sh
index 0fd1cf0c2b94..693dfa1de430 100755
--- a/scripts/atomic/gen-atomic-fallback.sh
+++ b/scripts/atomic/gen-atomic-fallback.sh
@@ -58,6 +58,21 @@ cat << EOF
EOF
}
+gen_proto_order_variant()
+{
+ local meta="$1"; shift
+ local pfx="$1"; shift
+ local name="$1"; shift
+ local sfx="$1"; shift
+ local order="$1"; shift
+ local arch="$1"
+ local atomic="$2"
+
+ local basename="${arch}${atomic}_${pfx}${name}${sfx}"
+
+ printf "#define arch_${basename}${order} ${basename}${order}\n"
+}
+
#gen_proto_order_variants(meta, pfx, name, sfx, arch, atomic, int, args...)
gen_proto_order_variants()
{
@@ -72,6 +87,22 @@ gen_proto_order_variants()
local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
+ if [ -z "$arch" ]; then
+ gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "" "$@"
+
+ if meta_has_acquire "${meta}"; then
+ gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_acquire" "$@"
+ fi
+ if meta_has_release "${meta}"; then
+ gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_release" "$@"
+ fi
+ if meta_has_relaxed "${meta}"; then
+ gen_proto_order_variant "${meta}" "${pfx}" "${name}" "${sfx}" "_relaxed" "$@"
+ fi
+
+ echo ""
+ fi
+
# If we don't have relaxed atomics, then we don't bother with ordering fallbacks
# read_acquire and set_release need to be templated, though
if ! meta_has_relaxed "${meta}"; then