linux-kernel - [PATCH v5.10 13/15] arm64: armv8_deprecated: move aarch32 helper earlier

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Date:   Wed, 11 Oct 2023 07:26:59 +0000
From:   Jinjie Ruan <ruanjinjie@...wei.com>
To:     <catalin.marinas@....com>, <will@...nel.org>,
        <yuzenghui@...wei.com>, <anshuman.khandual@....com>,
        <gregkh@...uxfoundation.org>, <mark.rutland@....com>,
        <broonie@...nel.org>, <youngmin.nam@...sung.com>,
        <renzhijie2@...wei.com>, <ardb@...nel.org>, <f.fainelli@...il.com>,
        <james.morse@....com>, <sashal@...nel.org>,
        <scott@...amperecomputing.com>, <ebiederm@...ssion.com>,
        <haibinzhang@...cent.com>, <hewenliang4@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <ruanjinjie@...wei.com>
Subject: [PATCH v5.10 13/15] arm64: armv8_deprecated: move aarch32 helper earlier

From: Mark Rutland <mark.rutland@....com>

Subsequent patches will rework the logic in armv8_deprecated.c.

In preparation for subsequent changes, this patch moves some shared logic
earlier in the file. This will make subsequent diffs simpler and easier to
read.

At the same time, drop the `__kprobes` annotation from
aarch32_check_condition(), as this is only used for traps from compat
userspace, and has no risk of recursion within kprobes. As this is the
last kprobes annotation in armve8_deprecated.c, we no longer need to
include <asm/kprobes.h>.

Signed-off-by: Mark Rutland <mark.rutland@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: James Morse <james.morse@....com>
Cc: Joey Gouly <joey.gouly@....com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Will Deacon <will@...nel.org>
Link: https://lore.kernel.org/r/20221019144123.612388-9-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@...nel.org>
---
 arch/arm64/kernel/armv8_deprecated.c | 39 ++++++++++++++--------------
 1 file changed, 19 insertions(+), 20 deletions(-)

diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c
index 529a877a1bb2..98dc7f8b8c08 100644
--- a/arch/arm64/kernel/armv8_deprecated.c
+++ b/arch/arm64/kernel/armv8_deprecated.c
@@ -17,7 +17,6 @@
 #include <asm/sysreg.h>
 #include <asm/system_misc.h>
 #include <asm/traps.h>
-#include <asm/kprobes.h>
 
 #define CREATE_TRACE_POINTS
 #include "trace-events-emulation.h"
@@ -52,6 +51,25 @@ struct insn_emulation {
 	int max;
 };
 
+#define ARM_OPCODE_CONDTEST_FAIL   0
+#define ARM_OPCODE_CONDTEST_PASS   1
+#define ARM_OPCODE_CONDTEST_UNCOND 2
+
+#define	ARM_OPCODE_CONDITION_UNCOND	0xf
+
+static unsigned int aarch32_check_condition(u32 opcode, u32 psr)
+{
+	u32 cc_bits  = opcode >> 28;
+
+	if (cc_bits != ARM_OPCODE_CONDITION_UNCOND) {
+		if ((*aarch32_opcode_cond_checks[cc_bits])(psr))
+			return ARM_OPCODE_CONDTEST_PASS;
+		else
+			return ARM_OPCODE_CONDTEST_FAIL;
+	}
+	return ARM_OPCODE_CONDTEST_UNCOND;
+}
+
 /*
  *  Implement emulation of the SWP/SWPB instructions using load-exclusive and
  *  store-exclusive.
@@ -138,25 +156,6 @@ static int emulate_swpX(unsigned int address, unsigned int *data,
 	return res;
 }
 
-#define ARM_OPCODE_CONDTEST_FAIL   0
-#define ARM_OPCODE_CONDTEST_PASS   1
-#define ARM_OPCODE_CONDTEST_UNCOND 2
-
-#define	ARM_OPCODE_CONDITION_UNCOND	0xf
-
-static unsigned int __kprobes aarch32_check_condition(u32 opcode, u32 psr)
-{
-	u32 cc_bits  = opcode >> 28;
-
-	if (cc_bits != ARM_OPCODE_CONDITION_UNCOND) {
-		if ((*aarch32_opcode_cond_checks[cc_bits])(psr))
-			return ARM_OPCODE_CONDTEST_PASS;
-		else
-			return ARM_OPCODE_CONDTEST_FAIL;
-	}
-	return ARM_OPCODE_CONDTEST_UNCOND;
-}
-
 /*
  * swp_handler logs the id of calling process, dissects the instruction, sanity
  * checks the memory location, calls emulate_swpX for the actual operation and
-- 
2.34.1