From 61598093bbdd283a7edc367d900f223070ead8d2 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:43:03 +0000
Subject: [PATCH] add ax88772C AX88772C_eeprom_tools
---
kernel/kernel/kexec_core.c | 58 +++++++++++++++++++++++++++++++++-------------------------
1 files changed, 33 insertions(+), 25 deletions(-)
diff --git a/kernel/kernel/kexec_core.c b/kernel/kernel/kexec_core.c
index 6b3d7f7..3a37fc6 100644
--- a/kernel/kernel/kexec_core.c
+++ b/kernel/kernel/kexec_core.c
@@ -1,9 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* kexec.c - kexec system call core code.
* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
- *
- * This source code is licensed under the GNU General Public License,
- * Version 2. See the file COPYING for more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -38,7 +36,7 @@
#include <linux/syscore_ops.h>
#include <linux/compiler.h>
#include <linux/hugetlb.h>
-#include <linux/frame.h>
+#include <linux/objtool.h>
#include <asm/page.h>
#include <asm/sections.h>
@@ -47,7 +45,7 @@
#include <crypto/sha.h>
#include "kexec_internal.h"
-DEFINE_MUTEX(kexec_mutex);
+atomic_t __kexec_lock = ATOMIC_INIT(0);
/* Per cpu memory for storing cpu states in case of system crash. */
note_buf_t __percpu *crash_notes;
@@ -111,7 +109,7 @@
* defined more restrictively in <asm/kexec.h>.
*
* The code for the transition from the current kernel to the
- * the new kernel is placed in the control_code_buffer, whose size
+ * new kernel is placed in the control_code_buffer, whose size
* is given by KEXEC_CONTROL_PAGE_SIZE. In the best case only a single
* page of memory is necessary, but some architectures require more.
* Because this memory must be identity mapped in the transition from
@@ -152,6 +150,7 @@
int i;
unsigned long nr_segments = image->nr_segments;
unsigned long total_pages = 0;
+ unsigned long nr_pages = totalram_pages();
/*
* Verify we have good destination addresses. The caller is
@@ -217,13 +216,13 @@
* wasted allocating pages, which can cause a soft lockup.
*/
for (i = 0; i < nr_segments; i++) {
- if (PAGE_COUNT(image->segment[i].memsz) > totalram_pages / 2)
+ if (PAGE_COUNT(image->segment[i].memsz) > nr_pages / 2)
return -EINVAL;
total_pages += PAGE_COUNT(image->segment[i].memsz);
}
- if (total_pages > totalram_pages / 2)
+ if (total_pages > nr_pages / 2)
return -EINVAL;
/*
@@ -590,6 +589,12 @@
kimage_free_page_list(&image->unusable_pages);
}
+
+int __weak machine_kexec_post_load(struct kimage *image)
+{
+ return 0;
+}
+
void kimage_terminate(struct kimage *image)
{
if (*image->entry != 0)
@@ -938,7 +943,7 @@
*/
void __noclone __crash_kexec(struct pt_regs *regs)
{
- /* Take the kexec_mutex here to prevent sys_kexec_load
+ /* Take the kexec_lock here to prevent sys_kexec_load
* running on one cpu from replacing the crash kernel
* we are using after a panic on a different cpu.
*
@@ -946,7 +951,7 @@
* of memory the xchg(&kexec_crash_image) would be
* sufficient. But since I reuse the memory...
*/
- if (mutex_trylock(&kexec_mutex)) {
+ if (kexec_trylock()) {
if (kexec_crash_image) {
struct pt_regs fixed_regs;
@@ -955,7 +960,7 @@
machine_crash_shutdown(&fixed_regs);
machine_kexec(kexec_crash_image);
}
- mutex_unlock(&kexec_mutex);
+ kexec_unlock();
}
}
STACK_FRAME_NON_STANDARD(__crash_kexec);
@@ -984,14 +989,17 @@
}
}
-size_t crash_get_memory_size(void)
+ssize_t crash_get_memory_size(void)
{
- size_t size = 0;
+ ssize_t size = 0;
- mutex_lock(&kexec_mutex);
+ if (!kexec_trylock())
+ return -EBUSY;
+
if (crashk_res.end != crashk_res.start)
size = resource_size(&crashk_res);
- mutex_unlock(&kexec_mutex);
+
+ kexec_unlock();
return size;
}
@@ -1011,7 +1019,8 @@
unsigned long old_size;
struct resource *ram_res;
- mutex_lock(&kexec_mutex);
+ if (!kexec_trylock())
+ return -EBUSY;
if (kexec_crash_image) {
ret = -ENOENT;
@@ -1020,6 +1029,7 @@
start = crashk_res.start;
end = crashk_res.end;
old_size = (end == 0) ? 0 : end - start + 1;
+ new_size = roundup(new_size, KEXEC_CRASH_MEM_ALIGN);
if (new_size >= old_size) {
ret = (new_size == old_size) ? 0 : -EINVAL;
goto unlock;
@@ -1031,9 +1041,7 @@
goto unlock;
}
- start = roundup(start, KEXEC_CRASH_MEM_ALIGN);
- end = roundup(start + new_size, KEXEC_CRASH_MEM_ALIGN);
-
+ end = start + new_size;
crash_free_reserved_phys_range(end, crashk_res.end);
if ((start == end) && (crashk_res.parent != NULL))
@@ -1049,7 +1057,7 @@
insert_resource(&iomem_resource, ram_res);
unlock:
- mutex_unlock(&kexec_mutex);
+ kexec_unlock();
return ret;
}
@@ -1121,7 +1129,7 @@
{
int error = 0;
- if (!mutex_trylock(&kexec_mutex))
+ if (!kexec_trylock())
return -EBUSY;
if (!kexec_image) {
error = -EINVAL;
@@ -1150,7 +1158,7 @@
error = dpm_suspend_end(PMSG_FREEZE);
if (error)
goto Resume_devices;
- error = disable_nonboot_cpus();
+ error = suspend_disable_secondary_cpus();
if (error)
goto Enable_cpus;
local_irq_disable();
@@ -1171,7 +1179,7 @@
* CPU hotplug again; so re-enable it here.
*/
cpu_hotplug_enable();
- pr_emerg("Starting new kernel\n");
+ pr_notice("Starting new kernel\n");
machine_shutdown();
}
@@ -1183,7 +1191,7 @@
Enable_irqs:
local_irq_enable();
Enable_cpus:
- enable_nonboot_cpus();
+ suspend_enable_secondary_cpus();
dpm_resume_start(PMSG_RESTORE);
Resume_devices:
dpm_resume_end(PMSG_RESTORE);
@@ -1196,7 +1204,7 @@
#endif
Unlock:
- mutex_unlock(&kexec_mutex);
+ kexec_unlock();
return error;
}
--
Gitblit v1.6.2