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authorBalbir Singh <bsingharora@gmail.com>2017-06-28 20:04:09 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2017-07-04 04:37:39 +0300
commit7614ff3272a115a047139173cc04466e8132a1f2 (patch)
tree6215fd8d6460f772c73639a0c1459398067db360 /arch/powerpc/mm/pgtable_64.c
parentcd65d69713349fc7b33fa9de2b32989b99c9fb39 (diff)
downloadlinux-7614ff3272a115a047139173cc04466e8132a1f2.tar.xz
powerpc/mm/radix: Implement STRICT_RWX/mark_rodata_ro() for Radix
The Radix linear mapping code (create_physical_mapping()) tries to use the largest page size it can at each step. Currently the only reason it steps down to a smaller page size is if the start addr is unaligned (never happens in practice), or the end of memory is not aligned to a huge page boundary. To support STRICT_RWX we need to break the mapping at __init_begin, so that the text and rodata prior to that can be marked R_X and the regular pages after can be marked RW. Having done that we can now implement mark_rodata_ro() for Radix, knowing that we won't need to split any mappings. Signed-off-by: Balbir Singh <bsingharora@gmail.com> [mpe: Split down to PAGE_SIZE, not 2MB, rewrite change log] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/pgtable_64.c')
-rw-r--r--arch/powerpc/mm/pgtable_64.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index fc2e6def2eb7..5c0b795d656c 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -500,7 +500,9 @@ void mark_rodata_ro(void)
return;
}
- if (!radix_enabled())
+ if (radix_enabled())
+ radix__mark_rodata_ro();
+ else
hash__mark_rodata_ro();
}
#endif