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powerpc/mmu: add is_strict_kernel_rwx() helper
Add a helper to know whether STRICT_KERNEL_RWX is enabled. This is based on rodata_enabled flag which is defined only when CONFIG_STRICT_KERNEL_RWX is selected. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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02d5d13b45
commit
28ea38b9cb
2 changed files with 12 additions and 3 deletions
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@ -289,6 +289,17 @@ static inline u16 get_mm_addr_key(struct mm_struct *mm, unsigned long address)
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}
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#endif /* CONFIG_PPC_MEM_KEYS */
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#ifdef CONFIG_STRICT_KERNEL_RWX
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static inline bool strict_kernel_rwx_enabled(void)
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{
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return rodata_enabled;
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}
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#else
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static inline bool strict_kernel_rwx_enabled(void)
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{
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return false;
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}
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#endif
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#endif /* !__ASSEMBLY__ */
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/* The kernel use the constants below to index in the page sizes array.
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@ -108,12 +108,10 @@ static void __init MMU_setup(void)
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__map_without_bats = 1;
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__map_without_ltlbs = 1;
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}
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#ifdef CONFIG_STRICT_KERNEL_RWX
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if (rodata_enabled) {
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if (strict_kernel_rwx_enabled()) {
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__map_without_bats = 1;
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__map_without_ltlbs = 1;
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}
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#endif
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}
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/*
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