linux-kernel - [PATCH] x86/init: fix build with CONFIG

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Message-Id: <20180814185047.21139-1-vbabka@suse.cz>
Date:   Tue, 14 Aug 2018 20:50:47 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>
Cc:     "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tomas Pruzina <pruzinat@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>, stable@...r.kernel.org
Subject: [PATCH] x86/init: fix build with CONFIG_SWAP=n

The introduction of generic_max_swapfile_size and arch-specific versions has
broken linking on x86 with CONFIG_SWAP=n due to undefined reference to
'generic_max_swapfile_size'. Fix it by compiling the x86-specific
max_swapfile_size() only with CONFIG_SWAP=y.

Reported-by: Tomas Pruzina <pruzinat@...il.com>
Fixes: 377eeaa8e11f ("x86/speculation/l1tf: Limit swap file size to MAX_PA/2")
Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
Cc: stable@...r.kernel.org
---
 arch/x86/mm/init.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 156ed8154af8..acfab322fbe0 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -914,6 +914,7 @@ void update_cache_mode_entry(unsigned entry, enum page_cache_mode cache)
 	__pte2cachemode_tbl[entry] = cache;
 }
 
+#ifdef CONFIG_SWAP
 unsigned long max_swapfile_size(void)
 {
 	unsigned long pages;
@@ -934,3 +935,4 @@ unsigned long max_swapfile_size(void)
 	}
 	return pages;
 }
+#endif
-- 
2.18.0