ARM: kernel: switch to relative exception tables

maillist inclusion
commit ccb456783dd71f474e5783a81d7f18c2cd4dda81
category: feature
feature: ARM kaslr support
bugzilla: 47952
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?h=arm-kaslr-latest&id=ccb456783dd71f474e5783a81d7f18c2cd4dda81



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To avoid having to relocate the contents of extable entries at
runtime when running with KASLR enabled, wire up the existing
support for emitting them as relative references. This ensures
these quantities are invariant under runtime relocation.

Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Cui GaoSheng <cuigaosheng1@huawei.com>
Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>