hi,
Please apply the commit below to -stable: new binutils broke the kernel build
back to and including v2.6.27.
Thanks!
Ingo
----- Forwarded message from tip-bot for Alexander van Heukelum
<[email protected]> -----
Date: Sat, 12 Mar 2011 08:04:00 GMT
From: tip-bot for Alexander van Heukelum <[email protected]>
To: [email protected]
Cc: [email protected], [email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected], [email protected],
[email protected], [email protected], [email protected],
[email protected]
Subject: [tip:x86/asm] x86, binutils, xen: Fix another wrong size directive
Commit-ID: 371c394af27ab7d1e58a66bc19d9f1f3ac1f67b4
Gitweb: http://git.kernel.org/tip/371c394af27ab7d1e58a66bc19d9f1f3ac1f67b4
Author: Alexander van Heukelum <[email protected]>
AuthorDate: Fri, 11 Mar 2011 21:59:38 +0100
Committer: Ingo Molnar <[email protected]>
CommitDate: Sat, 12 Mar 2011 09:02:29 +0100
x86, binutils, xen: Fix another wrong size directive
The latest binutils (2.21.0.20110302/Ubuntu) breaks the build
yet another time, under CONFIG_XEN=y due to a .size directive that
refers to a slightly differently named (hence, to the now very
strict and unforgiving assembler, non-existent) symbol.
[ mingo:
This unnecessary build breakage caused by new binutils
version 2.21 gets escallated back several kernel releases spanning
several years of Linux history, affecting over 130,000 upstream
kernel commits (!), on CONFIG_XEN=y 64-bit kernels (i.e. essentially
affecting all major Linux distro kernel configs).
Git annotate tells us that this slight debug symbol code mismatch
bug has been introduced in 2008 in commit 3d75e1b8:
3d75e1b8 (Jeremy Fitzhardinge 2008-07-08 15:06:49 -0700 1231)
ENTRY(xen_do_hypervisor_callback) # do_hypervisor_callback(struct *pt_regs)
The 'bug' is just a slight assymetry in ENTRY()/END()
debug-symbols sequences, with lots of assembly code between the
ENTRY() and the END():
ENTRY(xen_do_hypervisor_callback) # do_hypervisor_callback(struct
*pt_regs)
...
END(do_hypervisor_callback)
Human reviewers almost never catch such small mismatches, and binutils
never even warned about it either.
This new binutils version thus breaks the Xen build on all upstream kernels
since v2.6.27, out of the blue.
This makes a straightforward Git bisection of all 64-bit Xen-enabled kernels
impossible on such binutils, for a bisection window of over hundred
thousand historic commits. (!)
This is a major fail on the side of binutils and binutils needs to turn
this show-stopper build failure into a warning ASAP. ]
Signed-off-by: Alexander van Heukelum <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Cc: Jan Beulich <[email protected]>
Cc: H.J. Lu <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Kees Cook <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
---
arch/x86/kernel/entry_64.S | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index aed1ffb..bbd5c80 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1248,7 +1248,7 @@ ENTRY(xen_do_hypervisor_callback) #
do_hypervisor_callback(struct *pt_regs)
decl PER_CPU_VAR(irq_count)
jmp error_exit
CFI_ENDPROC
-END(do_hypervisor_callback)
+END(xen_do_hypervisor_callback)
/*
* Hypervisor uses this for application faults while it executes.
----- End forwarded message -----
--
Thanks,
Ingo
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