The patch titled
kexec: Avoid overwriting the current pgd: stubs
has been removed from the -mm tree. Its filename is
kexec-avoid-overwriting-the-current-pgd-v2-stubs.patch
This patch was probably dropped from -mm because
it has now been merged into a subsystem tree or
into Linus's tree, or because it was folded into
its parent patch in the -mm tree.
------------------------------------------------------
Subject: kexec: Avoid overwriting the current pgd: stubs
From: Magnus Damm <magnus@xxxxxxxxxxxxx>
This patchset updates the kexec code for i386 and x86_64 to avoid overwriting
the current pgd. For most people is overwriting the current pgd is not a big
problem. When kexec:ing into a new kernel that reinitializes and makes use of
all memory we don't care about saving state.
But overwriting the current pgd is not a good solution in the case of kdump
(CONFIG_CRASH_DUMP) where we want to preserve as much state as possible when a
crash occurs. This patch solves the overwriting issue.
This patch:
Add an architecture specific structure "struct kimage_arch" to struct
kimage. This structure is filled in with members by the architecture
specific patches followed by this one.
Signed-off-by: Magnus Damm <magnus@xxxxxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Cc: Haren Myneni <hbabu@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/asm-i386/kexec.h | 2 ++
include/asm-powerpc/kexec.h | 2 ++
include/asm-s390/kexec.h | 2 ++
include/asm-sh/kexec.h | 2 ++
include/asm-x86_64/kexec.h | 2 ++
include/linux/kexec.h | 2 ++
6 files changed, 12 insertions(+)
diff -puN include/asm-i386/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs include/asm-i386/kexec.h
--- 25/include/asm-i386/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs Wed May 24 14:47:28 2006
+++ 25-akpm/include/asm-i386/kexec.h Wed May 24 14:47:47 2006
@@ -29,6 +29,8 @@
#define MAX_NOTE_BYTES 1024
+struct kimage_arch {};
+
/* CPU does not save ss and esp on stack if execution is already
* running in kernel mode at the time of NMI occurrence. This code
* fixes it.
diff -puN include/asm-powerpc/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs include/asm-powerpc/kexec.h
--- 25/include/asm-powerpc/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs Wed May 24 14:47:28 2006
+++ 25-akpm/include/asm-powerpc/kexec.h Wed May 24 14:47:28 2006
@@ -109,6 +109,8 @@ static inline void crash_setup_regs(stru
#define MAX_NOTE_BYTES 1024
+struct kimage_arch {};
+
#ifdef __powerpc64__
extern void kexec_smp_wait(void); /* get and clear naca physid, wait for
master to copy new code to 0 */
diff -puN include/asm-s390/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs include/asm-s390/kexec.h
--- 25/include/asm-s390/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs Wed May 24 14:47:28 2006
+++ 25-akpm/include/asm-s390/kexec.h Wed May 24 14:47:28 2006
@@ -36,6 +36,8 @@
#define MAX_NOTE_BYTES 1024
+struct kimage_arch {};
+
/* Provide a dummy definition to avoid build failures. */
static inline void crash_setup_regs(struct pt_regs *newregs,
struct pt_regs *oldregs) { }
diff -puN include/asm-sh/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs include/asm-sh/kexec.h
--- 25/include/asm-sh/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs Wed May 24 14:47:28 2006
+++ 25-akpm/include/asm-sh/kexec.h Wed May 24 14:47:28 2006
@@ -25,6 +25,8 @@
#ifndef __ASSEMBLY__
+struct kimage_arch {};
+
extern void machine_shutdown(void);
extern void *crash_notes;
diff -puN include/asm-x86_64/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs include/asm-x86_64/kexec.h
--- 25/include/asm-x86_64/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs Wed May 24 14:47:28 2006
+++ 25-akpm/include/asm-x86_64/kexec.h Wed May 24 14:47:47 2006
@@ -29,6 +29,8 @@
#define MAX_NOTE_BYTES 1024
+struct kimage_arch {};
+
/*
* Saving the registers of the cpu on which panic occured in
* crash_kexec to save a valid sp. The registers of other cpus
diff -puN include/linux/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs include/linux/kexec.h
--- 25/include/linux/kexec.h~kexec-avoid-overwriting-the-current-pgd-v2-stubs Wed May 24 14:47:28 2006
+++ 25-akpm/include/linux/kexec.h Wed May 24 14:47:28 2006
@@ -69,6 +69,8 @@ struct kimage {
unsigned long start;
struct page *control_code_page;
+ struct kimage_arch arch_data;
+
unsigned long nr_segments;
struct kexec_segment segment[KEXEC_SEGMENT_MAX];
_
Patches currently in -mm which might be from magnus@xxxxxxxxxxxxx are
kexec-avoid-overwriting-the-current-pgd-v2-stubs.patch
kexec-avoid-overwriting-the-current-pgd-v2-i386.patch
kexec-avoid-overwriting-the-current-pgd-v2-i386-tidy.patch
kexec-avoid-overwriting-the-current-pgd-v2-x86_64.patch
kexec-avoid-overwriting-the-current-pgd-v2-x86_64-tidy.patch
-
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