linux-kernel - Re: [PATCH mm v4 28/39] kasan, page_alloc: allow skipping unpoisoning for HW

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Date:   Tue, 21 Dec 2021 13:04:53 +0100
From:   Marco Elver <elver@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH mm v4 28/39] kasan, page_alloc: allow skipping
 unpoisoning for HW_TAGS

On Mon, Dec 20, 2021 at 11:02PM +0100, andrey.konovalov@...ux.dev wrote:
[...]
>  #ifdef CONFIG_KASAN_HW_TAGS
>  #define __def_gfpflag_names_kasan					      \
> -	, {(unsigned long)__GFP_SKIP_KASAN_POISON, "__GFP_SKIP_KASAN_POISON"}
> +	, {(unsigned long)__GFP_SKIP_KASAN_POISON, "__GFP_SKIP_KASAN_POISON"} \
> +	, {(unsigned long)__GFP_SKIP_KASAN_UNPOISON,			      \
> +						"__GFP_SKIP_KASAN_UNPOISON"}
>  #else
>  #define __def_gfpflag_names_kasan
>  #endif

Adhering to 80 cols here makes the above less readable. If you do a v5,
my suggestion is:

diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index f18eeb5fdde2..f9f0ae3a4b6b 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -51,11 +51,10 @@
 	{(unsigned long)__GFP_ZEROTAGS,		"__GFP_ZEROTAGS"}	\
 
 #ifdef CONFIG_KASAN_HW_TAGS
-#define __def_gfpflag_names_kasan					      \
-	, {(unsigned long)__GFP_SKIP_ZERO, "__GFP_SKIP_ZERO"}		      \
-	, {(unsigned long)__GFP_SKIP_KASAN_POISON, "__GFP_SKIP_KASAN_POISON"} \
-	, {(unsigned long)__GFP_SKIP_KASAN_UNPOISON,			      \
-						"__GFP_SKIP_KASAN_UNPOISON"}
+#define __def_gfpflag_names_kasan ,							\
+	{(unsigned long)__GFP_SKIP_ZERO,		"__GFP_SKIP_ZERO"},		\
+	{(unsigned long)__GFP_SKIP_KASAN_POISON,	"__GFP_SKIP_KASAN_POISON"},	\
+	{(unsigned long)__GFP_SKIP_KASAN_UNPOISON,	"__GFP_SKIP_KASAN_UNPOISON"}
 #else
 #define __def_gfpflag_names_kasan
 #endif