linux-kernel - [PATCH] arm64/uprobes: change the uprobe_opcode

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Date:   Wed, 28 Dec 2022 09:54:12 +0800 (CST)
From:   <guo.ziliang@....com.cn>
To:     <will@...nel.org>
Cc:     <catalin.marinas@....com>, <lkp@...el.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <huang.junhua@....com.cn>,
        <guo.ziliang@....com.cn>
Subject: [PATCH] arm64/uprobes: change the uprobe_opcode_t typedef to fix the sparse warning

From: junhua huang <huang.junhua@....com.cn>

After we fixed the uprobe inst endian in aarch_be, the sparse check report
the following warning info:

sparse warnings: (new ones prefixed by >>)
>> kernel/events/uprobes.c:223:25: sparse: sparse: restricted __le32 degrades to integer
>> kernel/events/uprobes.c:574:56: sparse: sparse: incorrect type in argument 4 (different base types)
@@     expected unsigned int [addressable] [usertype] opcode @@     got restricted __le32 [usertype] @@
   kernel/events/uprobes.c:574:56: sparse:     expected unsigned int [addressable] [usertype] opcode
   kernel/events/uprobes.c:574:56: sparse:     got restricted __le32 [usertype]
>> kernel/events/uprobes.c:1483:32: sparse: sparse: incorrect type in initializer (different base types)
@@     expected unsigned int [usertype] insn @@     got restricted __le32 [usertype] @@
   kernel/events/uprobes.c:1483:32: sparse:     expected unsigned int [usertype] insn
   kernel/events/uprobes.c:1483:32: sparse:     got restricted __le32 [usertype]

use the __le32 to u32 for uprobe_opcode_t, to keep the same.

Fixes: 60f07e22a73d ("arm64:uprobe fix the uprobe SWBP_INSN in big-endian")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: junhua huang <huang.junhua@....com.cn>
---
 arch/arm64/include/asm/uprobes.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/uprobes.h b/arch/arm64/include/asm/uprobes.h
index ba4bff5ca674..2b09495499c6 100644
--- a/arch/arm64/include/asm/uprobes.h
+++ b/arch/arm64/include/asm/uprobes.h
@@ -16,7 +16,7 @@
 #define UPROBE_SWBP_INSN_SIZE	AARCH64_INSN_SIZE
 #define UPROBE_XOL_SLOT_BYTES	MAX_UINSN_BYTES

-typedef u32 uprobe_opcode_t;
+typedef __le32 uprobe_opcode_t;

 struct arch_uprobe_task {
 };
-- 
2.15.2