[Xen-devel] [patch 42/44] xen: suppress abs symbol warnings for unused reloc pointers

[Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>]

arch/i386/xen/xen-asm.S defines some small pieces of code which are
used to implement a few paravirt_ops.  They're designed so they can be
used either in-place, or be inline patched into their callsites if
there's enough space.

Some of those operations need to make calls out (specifically, if you
re-enable events [interrupts], and there's a pending event at that
time).  These calls need the call instruction to be relocated if the
code is patched inline.  In this case xen_foo_reloc is a
section-relative symbol which points to xen_foo's required relocation.

Other operations have no need of a relocation, and so their
corresponding xen_bar_reloc is absolute 0.  These are the cases which
are triggering the warning.

This patch adds those symbols to the list of safe abs symbols.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
Cc: Adrian Bunk <bunk@xxxxxxxxx>

---
 arch/i386/boot/compressed/relocs.c |    2 ++
 1 file changed, 2 insertions(+)

===================================================================
--- a/arch/i386/boot/compressed/relocs.c
+++ b/arch/i386/boot/compressed/relocs.c
@@ -31,6 +31,8 @@ static const char* safe_abs_relocs[] = {
                "__kernel_rt_sigreturn",
                "__kernel_sigreturn",
                "SYSENTER_RETURN",
+               "xen_irq_disable_direct_reloc",
+               "xen_save_fl_direct_reloc",
 };
 
 static int is_safe_abs_reloc(const char* sym_name)

-- 


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