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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,
38f054d549 ("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>
This commit is contained in:
He Zhe 2019-08-20 22:53:10 +08:00 committed by Jessica Yu
parent 38f054d549
commit 3b5be16c7e
1 changed files with 6 additions and 1 deletions
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7
kernel/module.c
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@ -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))