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[Xen-devel] [PATCH] Xen i386 xen-head.S fix sections mixup

To: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, jeremy@xxxxxxxxxxxxx, chrisw@xxxxxxxxxxxx
Subject: [Xen-devel] [PATCH] Xen i386 xen-head.S fix sections mixup
From: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
Date: Sun, 19 Aug 2007 23:04:20 -0400
Cc: virtualization@xxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx
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Xen i386 xen-head.S fix sections mixup

xen-head.S does not come back to the data section, leaving the text section
as current section. It causes problems with a slightly enhanced DEBUG_RODATA
that supports CONFIG_HOTPLUG and bringing a CPU up after the text has been
marked read-only: reference to early_gdt_descr causes a page fault.

It applies on 2.6.22-rc2-mm2.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
CC: jeremy@xxxxxxxxxxxxx
CC: chrisw@xxxxxxxxxxxx
CC: virtualization@xxxxxxxxxxxxxx
CC: xen-devel@xxxxxxxxxxxxxxxxxxx
 arch/i386/xen/xen-head.S |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6-lttng/arch/i386/xen/xen-head.S
--- linux-2.6-lttng.orig/arch/i386/xen/xen-head.S       2007-08-19 
22:45:58.000000000 -0400
+++ linux-2.6-lttng/arch/i386/xen/xen-head.S    2007-08-19 22:46:19.000000000 
@@ -13,6 +13,7 @@ ENTRY(startup_xen)
        movl $(init_thread_union+THREAD_SIZE),%esp
        jmp xen_start_kernel
+       .previous
 .pushsection ".bss.page_aligned"
        .align PAGE_SIZE_asm
@@ -34,5 +35,6 @@ ENTRY(hypercall_page)
        ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE,       .asciz "no")
        ELFNOTE(Xen, XEN_ELFNOTE_LOADER,         .asciz "generic")
+       .previous
 #endif /*CONFIG_XEN */

Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68

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