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From:   "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
To:     linux-kernel@vger.kernel.org
Cc:     Martin Liska <mliska@suse.cz>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Alexander Potapenko <glider@google.com>,
        Andrey Konovalov <andreyknvl@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        kasan-dev@googlegroups.com, linux-mm@kvack.org,
        Jiri Slaby <jslaby@suse.cz>
Subject: [PATCH 45/46] kasan, lto: remove extra BUILD_BUG() in memory_is_poisoned
Date:   Mon, 14 Nov 2022 12:43:43 +0100
Message-Id: <20221114114344.18650-46-jirislaby@kernel.org>
In-Reply-To: <20221114114344.18650-1-jirislaby@kernel.org>
References: <20221114114344.18650-1-jirislaby@kernel.org>
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From: Martin Liska <mliska@suse.cz>

The function memory_is_poisoned() can handle any size which can be
propagated by LTO later on. So we can end up with a constant that is not
handled in the switch. Thus just break and call memory_is_poisoned_n()
which handles arbitrary size to avoid build errors with gcc LTO.

Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: kasan-dev@googlegroups.com
Cc: linux-mm@kvack.org
Signed-off-by: Martin Liska <mliska@suse.cz>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 mm/kasan/generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index d8b5590f9484..d261f83c6687 100644
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -152,7 +152,7 @@ static __always_inline bool memory_is_poisoned(unsigned long addr, size_t size)
 		case 16:
 			return memory_is_poisoned_16(addr);
 		default:
-			BUILD_BUG();
+			break;
 		}
 	}
 
-- 
2.38.1