linux-kernel - [PATCH v4 2/4] mm: move is_kernel_rodata() to asm-generic/sections.h

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Date:   Tue, 25 Sep 2018 14:46:27 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Arnd Bergmann <arnd@...db.de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Arend van Spriel <aspriel@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Joe Perches <joe@...ches.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Roman Gushchin <guro@...com>, Michal Hocko <mhocko@...e.com>,
        Huang Ying <ying.huang@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        Bartosz Golaszewski <brgl@...ev.pl>
Subject: [PATCH v4 2/4] mm: move is_kernel_rodata() to asm-generic/sections.h

Export this routine so that we can use it later in devm_kstrdup_const()
and devm_kfree_const().

Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Acked-by: Mike Rapoport <rppt@...ux.vnet.ibm.com>
---
 include/asm-generic/sections.h | 14 ++++++++++++++
 mm/util.c                      |  7 -------
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index 849cd8eb5ca0..d79abca81a52 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -141,4 +141,18 @@ static inline bool init_section_intersects(void *virt, size_t size)
 	return memory_intersects(__init_begin, __init_end, virt, size);
 }
 
+/**
+ * is_kernel_rodata - checks if the pointer address is located in the
+ *                    .rodata section
+ *
+ * @addr: address to check
+ *
+ * Returns: true if the address is located in .rodata, false otherwise.
+ */
+static inline bool is_kernel_rodata(unsigned long addr)
+{
+	return addr >= (unsigned long)__start_rodata &&
+	       addr < (unsigned long)__end_rodata;
+}
+
 #endif /* _ASM_GENERIC_SECTIONS_H_ */
diff --git a/mm/util.c b/mm/util.c
index 9e3ebd2ef65f..470f5cd80b64 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -15,17 +15,10 @@
 #include <linux/vmalloc.h>
 #include <linux/userfaultfd_k.h>
 
-#include <asm/sections.h>
 #include <linux/uaccess.h>
 
 #include "internal.h"
 
-static inline int is_kernel_rodata(unsigned long addr)
-{
-	return addr >= (unsigned long)__start_rodata &&
-		addr < (unsigned long)__end_rodata;
-}
-
 /**
  * kfree_const - conditionally free memory
  * @x: pointer to the memory
-- 
2.18.0