Commit 5707bf6b authored by Ralf Baechle's avatar Ralf Baechle

MIPS: Document why RELOC_HIDE is there.

Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 1ec0e739
...@@ -150,6 +150,20 @@ typedef struct { unsigned long pgprot; } pgprot_t; ...@@ -150,6 +150,20 @@ typedef struct { unsigned long pgprot; } pgprot_t;
((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
#endif #endif
#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
/*
* RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
* (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The
* discussion can be found in lkml posting
* <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
* archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
*
* It is unclear if the misscompilations mentioned in
* http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
* until GCC 3.x has been retired before we can apply
* https://patchwork.linux-mips.org/patch/1541/
*/
#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment