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[15/21] lto, x86, mm: Disable vmalloc BUILD_BUG_ON for LTO

Message ID 20171127213423.27218-16-andi@firstfloor.org (mailing list archive)
State New, archived
Headers show

Commit Message

Andi Kleen Nov. 27, 2017, 9:34 p.m. UTC 
From: Andi Kleen <ak@linux.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@linux.intel.com>
---
 arch/x86/mm/init_32.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

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