x86: Document linker script ASSERT() quirk
Older binutils breaks if ASSERT() is used without a sink for the output. For example 2.14.90.0.6 is known to be broken, the link fails with: LD .tmp_vmlinux1 ld:arch/x86/kernel/vmlinux.lds:678: parse error Document this quirk in all three files that use it. See: http://marc.info/?l=linux-kbuild&m=124930110427870&w=2 See[2]: d2ba8b21 ("x86: Fix assert syntax in vmlinux.lds.S") Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Roland McGrath <roland@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Sam Ravnborg <sam@ravnborg.org> LKML-Reference: <4AD6523D.5030909@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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