linux-kernel - [RFC RESEND PATCH 3/6] mm, x86: make __kernel_map

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Message-Id: <0ba5f3c6d7fc0078d091c507cda980ef5cd710b2.1542905228.git.jsteckli@amazon.de>
Date:   Thu, 22 Nov 2018 17:49:36 +0100
From:   Julian Stecklina <jsteckli@...zon.de>
To:     kernel-hardening@...ts.openwall.com
Cc:     Julian Stecklina <jsteckli@...zon.de>,
        Liran Alon <liran.alon@...cle.com>,
        Tycho Andersen <tycho@...ho.ws>,
        Jonathan Adams <jwadams@...gle.com>,
        David Woodhouse <dwmw2@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [RFC RESEND PATCH 3/6] mm, x86: make __kernel_map_pages always available

__kernel_map_pages is currently only enabled when CONFIG_DEBUG_PAGEALLOC
is defined. Enable it unconditionally instead.

Signed-off-by: Julian Stecklina <jsteckli@...zon.de>
---
 arch/x86/mm/pageattr.c | 3 +--
 include/linux/mm.h     | 3 ++-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 51a5a69ecac9..bd3b194400c1 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -2025,8 +2025,6 @@ int set_pages_rw(struct page *page, int numpages)
 	return set_memory_rw(addr, numpages);
 }
 
-#ifdef CONFIG_DEBUG_PAGEALLOC
-
 static int __set_pages_p(struct page *page, int numpages)
 {
 	unsigned long tempaddr = (unsigned long) page_address(page);
@@ -2093,6 +2091,7 @@ void __kernel_map_pages(struct page *page, int numpages, int enable)
 	arch_flush_lazy_mmu_mode();
 }
 
+#ifdef CONFIG_DEBUG_PAGEALLOC
 #ifdef CONFIG_HIBERNATION
 
 bool kernel_page_present(struct page *page)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index a61ebe8ad4ca..a0b9feefebb1 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2589,9 +2589,10 @@ static inline void kernel_poison_pages(struct page *page, int numpages,
 					int enable) { }
 #endif
 
+extern void __kernel_map_pages(struct page *page, int numpages, int enable);
+
 #ifdef CONFIG_DEBUG_PAGEALLOC
 extern bool _debug_pagealloc_enabled;
-extern void __kernel_map_pages(struct page *page, int numpages, int enable);
 
 static inline bool debug_pagealloc_enabled(void)
 {
-- 
2.17.1