linux-kernel - [PATCH 15/21] lto, x86, mm: Disable vmalloc BUILD_BUG

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Date:   Mon, 27 Nov 2017 13:34:17 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     linux-kernel@...r.kernel.org
Cc:     x86@...nel.org, samitolvanen@...gle.com, alxmtvv@...il.com,
        linux-kbuild@...r.kernel.org, yamada.masahiro@...ionext.com,
        akpm@...ux-foundation.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 15/21] lto, x86, mm: Disable vmalloc BUILD_BUG_ON for LTO

From: Andi Kleen <ak@...ux.intel.com>

On 32bit builds this BUILD_BUG_ON often fires with LTO for unknown
reasons. As far as I can tell it's a false positive. So disable
it for LTO.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/mm/init_32.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 8a64a6f2848d..8187d8ee98ee 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -808,7 +808,9 @@ void __init mem_init(void)
 	BUILD_BUG_ON(VMALLOC_END			> PKMAP_BASE);
 #endif
 #define high_memory (-128UL << 20)
+#ifndef CONFIG_LTO
 	BUILD_BUG_ON(VMALLOC_START			>= VMALLOC_END);
+#endif
 #undef high_memory
 #undef __FIXADDR_TOP
 
-- 
2.13.6