From bccf1ec369ac126b0997d01a6e1deae00e2cf6b3 Mon Sep 17 00:00:00 2001
From: Mark Rutland <mark.rutland@arm.com>
Date: Tue, 25 May 2021 15:02:32 +0100
Subject: locking/atomics: atomic-instrumented: simplify ifdeffery

Now that all architectures implement ARCH_ATOMIC, the fallbacks are
generated before the instrumented wrappers are generated. Due to this,
in atomic-instrumented.h we can assume that the whole set of atomic
functions has been generated. Likewise, atomic-instrumented.h doesn't
need to provide a preprocessor definition for every atomic it wraps.

This patch removes the redundant ifdeffery.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210525140232.53872-34-mark.rutland@arm.com
---
 scripts/atomic/gen-atomic-instrumented.sh | 51 ++-----------------------------
 1 file changed, 2 insertions(+), 49 deletions(-)

(limited to 'scripts/atomic')

diff --git a/scripts/atomic/gen-atomic-instrumented.sh b/scripts/atomic/gen-atomic-instrumented.sh
index 5766ffcec7c5..b0c45aee19d7 100755
--- a/scripts/atomic/gen-atomic-instrumented.sh
+++ b/scripts/atomic/gen-atomic-instrumented.sh
@@ -41,34 +41,6 @@ gen_params_checks()
 	done
 }
 
-# gen_guard(meta, atomic, pfx, name, sfx, order)
-gen_guard()
-{
-	local meta="$1"; shift
-	local atomic="$1"; shift
-	local pfx="$1"; shift
-	local name="$1"; shift
-	local sfx="$1"; shift
-	local order="$1"; shift
-
-	local atomicname="arch_${atomic}_${pfx}${name}${sfx}${order}"
-
-	local template="$(find_fallback_template "${pfx}" "${name}" "${sfx}" "${order}")"
-
-	# We definitely need a preprocessor symbol for this atomic if it is an
-	# ordering variant, or if there's a generic fallback.
-	if [ ! -z "${order}" ] || [ ! -z "${template}" ]; then
-		printf "defined(${atomicname})"
-		return
-	fi
-
-	# If this is a base variant, but a relaxed variant *may* exist, then we
-	# only have a preprocessor symbol if the relaxed variant isn't defined
-	if meta_has_relaxed "${meta}"; then
-		printf "!defined(${atomicname}_relaxed) || defined(${atomicname})"
-	fi
-}
-
 #gen_proto_order_variant(meta, pfx, name, sfx, order, atomic, int, arg...)
 gen_proto_order_variant()
 {
@@ -82,16 +54,12 @@ gen_proto_order_variant()
 
 	local atomicname="${atomic}_${pfx}${name}${sfx}${order}"
 
-	local guard="$(gen_guard "${meta}" "${atomic}" "${pfx}" "${name}" "${sfx}" "${order}")"
-
 	local ret="$(gen_ret_type "${meta}" "${int}")"
 	local params="$(gen_params "${int}" "${atomic}" "$@")"
 	local checks="$(gen_params_checks "${meta}" "$@")"
 	local args="$(gen_args "$@")"
 	local retstmt="$(gen_ret_stmt "${meta}")"
 
-	[ ! -z "${guard}" ] && printf "#if ${guard}\n"
-
 cat <<EOF
 static __always_inline ${ret}
 ${atomicname}(${params})
@@ -99,11 +67,8 @@ ${atomicname}(${params})
 ${checks}
 	${retstmt}arch_${atomicname}(${args});
 }
-#define ${atomicname} ${atomicname}
 EOF
 
-	[ ! -z "${guard}" ] && printf "#endif\n"
-
 	printf "\n"
 }
 
@@ -139,19 +104,6 @@ EOF
 	fi
 }
 
-gen_optional_xchg()
-{
-	local name="$1"; shift
-	local sfx="$1"; shift
-	local guard="defined(arch_${name}${sfx})"
-
-	[ -z "${sfx}" ] && guard="!defined(arch_${name}_relaxed) || defined(arch_${name})"
-
-	printf "#if ${guard}\n"
-	gen_xchg "${name}${sfx}" ""
-	printf "#endif\n\n"
-}
-
 cat << EOF
 // SPDX-License-Identifier: GPL-2.0
 
@@ -188,7 +140,8 @@ done
 
 for xchg in "xchg" "cmpxchg" "cmpxchg64" "try_cmpxchg"; do
 	for order in "" "_acquire" "_release" "_relaxed"; do
-		gen_optional_xchg "${xchg}" "${order}"
+		gen_xchg "${xchg}${order}" ""
+		printf "\n"
 	done
 done
 
-- 
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