[patch 20/24] Add __discard section to x86

Mathieu Desnoyers
2007-12-21T02:02:39Z

[-- Attachment #1: add-discard-section-to-x86.patch --]
[-- Type: text/plain, Size: 1776 bytes --]

Add a __discard sectionto the linker script. Code produced in this section will
not be put in the vmlinux file. This is useful when we have to calculate the
size of an instruction before actually declaring it (for alignment purposes for
instance). This is used by the immediate values.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Acked-by: H. Peter Anvin <hpa@zytor.com>
CC: Andi Kleen <ak@muc.de>
CC: Chuck Ebbert <cebbert@redhat.com>
CC: Christoph Hellwig <hch@infradead.org>
CC: Jeremy Fitzhardinge <jeremy@goop.org>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
---
arch/x86/kernel/vmlinux_32.lds.S | 1 +
arch/x86/kernel/vmlinux_64.lds.S | 1 +
2 files changed, 2 insertions(+)

Index: linux-2.6-lttng/arch/x86/kernel/vmlinux_32.lds.S
===================================================================
--- linux-2.6-lttng.orig/arch/x86/kernel/vmlinux_32.lds.S 2007-11-14 14:10:43.000000000 -0500
+++ linux-2.6-lttng/arch/x86/kernel/vmlinux_32.lds.S 2007-11-14 14:11:32.000000000 -0500
@@ -205,6 +205,7 @@ SECTIONS
/* Sections to be discarded */
/DISCARD/ : {
*(.exitcall.exit)
+ *(__discard)
}

STABS_DEBUG
Index: linux-2.6-lttng/arch/x86/kernel/vmlinux_64.lds.S
===================================================================
--- linux-2.6-lttng.orig/arch/x86/kernel/vmlinux_64.lds.S 2007-11-14 14:10:46.000000000 -0500
+++ linux-2.6-lttng/arch/x86/kernel/vmlinux_64.lds.S 2007-11-14 14:11:48.000000000 -0500
@@ -227,6 +227,7 @@ SECTIONS
/DISCARD/ : {
*(.exitcall.exit)
*(.eh_frame)
+ *(__discard)
}

STABS_DEBUG