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authorHe Zhe <zhe.he@windriver.com>2019-08-20 17:53:10 +0300
committerJessica Yu <jeyu@kernel.org>2019-08-21 11:43:56 +0300
commit3b5be16c7e90a69c93349d210766250fffcb54bd (patch)
tree51ee2d4207b59df48a4123070713d7772838f7d6 /kernel
parent38f054d549a869f22a02224cd276a27bf14b6171 (diff)
downloadlinux-3b5be16c7e90a69c93349d210766250fffcb54bd.tar.xz
modules: page-align module section allocations only for arches supporting strict module rwx
We should keep the case of "#define debug_align(X) (X)" for all arches without CONFIG_HAS_STRICT_MODULE_RWX ability, which would save people, who are sensitive to system size, a lot of memory when using modules, especially for embedded systems. This is also the intention of the original #ifdef... statement and still valid for now. Note that this still keeps the effect of the fix of the following commit, 38f054d549a8 ("modules: always page-align module section allocations"), since when CONFIG_ARCH_HAS_STRICT_MODULE_RWX is enabled, module pages are aligned. Signed-off-by: He Zhe <zhe.he@windriver.com> Signed-off-by: Jessica Yu <jeyu@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/module.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/module.c b/kernel/module.c
index cd8df516666d..9ee93421269c 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -64,9 +64,14 @@
/*
* Modules' sections will be aligned on page boundaries
- * to ensure complete separation of code and data
+ * to ensure complete separation of code and data, but
+ * only when CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y
*/
+#ifdef CONFIG_ARCH_HAS_STRICT_MODULE_RWX
# define debug_align(X) ALIGN(X, PAGE_SIZE)
+#else
+# define debug_align(X) (X)
+#endif
/* If this is set, the section belongs in the init part of the module */
#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))