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linux
MIPS: Document why RELOC_HIDE is there.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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arch/mips/include/asm/page.h
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arch/mips/include/asm/page.h
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((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
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#endif
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#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
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/*
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* RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
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* (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The
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* discussion can be found in lkml posting
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* <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
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* archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
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*
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* It is unclear if the misscompilations mentioned in
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* http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
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* until GCC 3.x has been retired before we can apply
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* https://patchwork.linux-mips.org/patch/1541/
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*/
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#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)