linux-kernel - [PATCH] RISC-V: uaccess: Wrap the get_user

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Message-Id: <20250610213058.24852-1-palmer@dabbelt.com>
Date: Tue, 10 Jun 2025 14:30:58 -0700
From: Palmer Dabbelt <palmer@...belt.com>
To:         linux-riscv@...ts.infradead.org
Cc: Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>,
  aou@...s.berkeley.edu, Alexandre Ghiti <alex@...ti.fr>, cyrilbur@...storrent.com, jszhang@...nel.org,
  cleger@...osinc.com, samuel.holland@...ive.com, linux-riscv@...ts.infradead.org,
  linux-kernel@...r.kernel.org
Subject: [PATCH] RISC-V: uaccess: Wrap the get_user_8 uaccess macro

From: Palmer Dabbelt <palmer@...belt.com>

I must have lost this rebasing things during the merge window, I know I
got it at some point but it's not here now.  Without this I get warnings
along the lines of

    include/linux/fs.h:3975:15: warning: label followed by a declaration is a C23 extension [-Wc23-extensions]
     3975 |         if (unlikely(get_user(c, path)))
          |                      ^
    arch/riscv/include/asm/uaccess.h:274:3: note: expanded from macro 'get_user'
      274 |                 __get_user((x), __p) :                          \
          |                 ^
    arch/riscv/include/asm/uaccess.h:244:2: note: expanded from macro '__get_user'
      244 |         __get_user_error(__gu_val, __gu_ptr, __gu_err);         \
          |         ^
    arch/riscv/include/asm/uaccess.h:207:2: note: expanded from macro '__get_user_error'
      207 |         __ge  LD [M]  net/802/psnap.ko
    t_user_nocheck(x, ptr, __gu_failed);                        \
          |         ^
    arch/riscv/include/asm/uaccess.h:196:3: note: expanded from macro '__get_user_nocheck'
      196 |                 __get_user_8((x), __gu_ptr, label);             \
          |                 ^
    arch/riscv/include/asm/uaccess.h:130:2: note: expanded from macro '__get_user_8'
      130 |         u32 __user *__ptr = (u32 __user *)(ptr);                \
          |         ^

Signed-off-by: Palmer Dabbelt <palmer@...belt.com>
---
 arch/riscv/include/asm/uaccess.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h
index d472da4450e6..525e50db24f7 100644
--- a/arch/riscv/include/asm/uaccess.h
+++ b/arch/riscv/include/asm/uaccess.h
@@ -127,6 +127,7 @@ do {								\
 
 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
 #define __get_user_8(x, ptr, label)				\
+do {								\
 	u32 __user *__ptr = (u32 __user *)(ptr);		\
 	u32 __lo, __hi;						\
 	asm_goto_output(					\
@@ -141,7 +142,7 @@ do {								\
 		: : label);                                     \
 	(x) = (__typeof__(x))((__typeof__((x) - (x)))(		\
 		(((u64)__hi << 32) | __lo)));			\
-
+} while (0)
 #else /* !CONFIG_CC_HAS_ASM_GOTO_OUTPUT */
 #define __get_user_8(x, ptr, label)				\
 do {								\
-- 
2.39.5 (Apple Git-154)