linux-kernel - Re: [PATCH 2/4] riscv: support DEBUG

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Date:   Sat, 25 Apr 2020 18:05:37 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Zong Li <zong.li@...ive.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        paul.walmsley@...ive.com, palmer@...belt.com,
        linux-riscv@...ts.infradead.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
        catalin.marinas@....com, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/4] riscv: support DEBUG_WX

On Tue, 21 Apr 2020 16:17:13 +0800 Zong Li <zong.li@...ive.com> wrote:

> Support DEBUG_WX to check whether there are mapping with write and
> execute permission at the same time.
> 
> --- a/arch/riscv/include/asm/ptdump.h
> +++ b/arch/riscv/include/asm/ptdump.h
> @@ -8,4 +8,10 @@
>  
>  void ptdump_check_wx(void);
>  
> +#ifdef CONFIG_DEBUG_WX
> +#define debug_checkwx() ptdump_check_wx()
> +#else
> +#define debug_checkwx() do { } while (0)
> +#endif
> +
>  #endif /* _ASM_RISCV_PTDUMP_H */

It's preferred to implement things in regular C, unless they MUST be
implemented in the preprocessor.  So...

--- a/arch/riscv/include/asm/ptdump.h~riscv-support-debug_wx-fix
+++ a/arch/riscv/include/asm/ptdump.h
@@ -9,9 +9,14 @@
 void ptdump_check_wx(void);
 
 #ifdef CONFIG_DEBUG_WX
-#define debug_checkwx() ptdump_check_wx()
+static inline void debug_checkwx(void)
+{
+	ptdump_check_wx();
+}
 #else
-#define debug_checkwx() do { } while (0)
+static inline void debug_checkwx(void)
+{
+}
 #endif
 
 #endif /* _ASM_RISCV_PTDUMP_H */
_