linux-kernel - [PATCH 8/8] kcsan: Move ctx to start of argument list

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Message-Id: <20210809112516.682816-9-elver@google.com>
Date:   Mon,  9 Aug 2021 13:25:16 +0200
From:   Marco Elver <elver@...gle.com>
To:     elver@...gle.com, paulmck@...nel.org
Cc:     mark.rutland@....com, dvyukov@...gle.com, glider@...gle.com,
        boqun.feng@...il.com, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: [PATCH 8/8] kcsan: Move ctx to start of argument list

It is clearer if ctx is at the start of the function argument list;
it'll be more consistent when adding functions with varying arguments
but all requiring ctx.

No functional change intended.

Signed-off-by: Marco Elver <elver@...gle.com>
---
 kernel/kcsan/core.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c
index 8b20af541776..4b84c8e7884b 100644
--- a/kernel/kcsan/core.c
+++ b/kernel/kcsan/core.c
@@ -222,7 +222,7 @@ static noinline void kcsan_check_scoped_accesses(void)
 
 /* Rules for generic atomic accesses. Called from fast-path. */
 static __always_inline bool
-is_atomic(const volatile void *ptr, size_t size, int type, struct kcsan_ctx *ctx)
+is_atomic(struct kcsan_ctx *ctx, const volatile void *ptr, size_t size, int type)
 {
 	if (type & KCSAN_ACCESS_ATOMIC)
 		return true;
@@ -259,7 +259,7 @@ is_atomic(const volatile void *ptr, size_t size, int type, struct kcsan_ctx *ctx
 }
 
 static __always_inline bool
-should_watch(const volatile void *ptr, size_t size, int type, struct kcsan_ctx *ctx)
+should_watch(struct kcsan_ctx *ctx, const volatile void *ptr, size_t size, int type)
 {
 	/*
 	 * Never set up watchpoints when memory operations are atomic.
@@ -268,7 +268,7 @@ should_watch(const volatile void *ptr, size_t size, int type, struct kcsan_ctx *
 	 * should not count towards skipped instructions, and (2) to actually
 	 * decrement kcsan_atomic_next for consecutive instruction stream.
 	 */
-	if (is_atomic(ptr, size, type, ctx))
+	if (is_atomic(ctx, ptr, size, type))
 		return false;
 
 	if (this_cpu_dec_return(kcsan_skip) >= 0)
@@ -637,7 +637,7 @@ check_access(const volatile void *ptr, size_t size, int type, unsigned long ip)
 	else {
 		struct kcsan_ctx *ctx = get_ctx(); /* Call only once in fast-path. */
 
-		if (unlikely(should_watch(ptr, size, type, ctx)))
+		if (unlikely(should_watch(ctx, ptr, size, type)))
 			kcsan_setup_watchpoint(ptr, size, type, ip);
 		else if (unlikely(ctx->scoped_accesses.prev))
 			kcsan_check_scoped_accesses();
-- 
2.32.0.605.g8dce9f2422-goog