linux-kernel - [PATCH 3.16 108/131] x86/init: fix build with CONFIG

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Date:   Sat, 29 Sep 2018 22:43:07 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Vlastimil Babka" <vbabka@...e.cz>,
        "Tomas Pruzina" <pruzinat@...il.com>
Subject: [PATCH 3.16 108/131] x86/init: fix build with CONFIG_SWAP=n

3.16.59-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Vlastimil Babka <vbabka@...e.cz>

commit 792adb90fa724ce07c0171cbc96b9215af4b1045 upstream.

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>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/mm/init.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -701,6 +701,7 @@ void __init zone_sizes_init(void)
 	free_area_init_nodes(max_zone_pfns);
 }
 
+#ifdef CONFIG_SWAP
 unsigned long max_swapfile_size(void)
 {
 	unsigned long pages;
@@ -713,3 +714,4 @@ unsigned long max_swapfile_size(void)
 	}
 	return pages;
 }
+#endif