diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2010-02-17 18:27:37 +0100 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2010-02-17 18:28:05 +0100 |
commit | b7e56edba4b02f2079042c326a8cd72a44635817 (patch) | |
tree | b5042002e9747cd8fb1278d61f86d8b92a74c018 /kernel/kexec.c | |
parent | 13ca0fcaa33f6b1984c4111b6ec5df42689fea6f (diff) | |
parent | b0483e78e5c4c9871fc5541875b3bc006846d46b (diff) |
Merge branch 'linus' into x86/mm
x86/mm is on 32-rc4 and missing the spinlock namespace changes which
are needed for further commits into this topic.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/kexec.c')
-rw-r--r-- | kernel/kexec.c | 65 |
1 files changed, 64 insertions, 1 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c index f336e2107f9..ef077fb7315 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -21,7 +21,7 @@ #include <linux/hardirq.h> #include <linux/elf.h> #include <linux/elfcore.h> -#include <linux/utsrelease.h> +#include <generated/utsrelease.h> #include <linux/utsname.h> #include <linux/numa.h> #include <linux/suspend.h> @@ -31,6 +31,8 @@ #include <linux/cpu.h> #include <linux/console.h> #include <linux/vmalloc.h> +#include <linux/swap.h> +#include <linux/kmsg_dump.h> #include <asm/page.h> #include <asm/uaccess.h> @@ -1073,6 +1075,9 @@ void crash_kexec(struct pt_regs *regs) if (mutex_trylock(&kexec_mutex)) { if (kexec_crash_image) { struct pt_regs fixed_regs; + + kmsg_dump(KMSG_DUMP_KEXEC); + crash_setup_regs(&fixed_regs, regs); crash_save_vmcoreinfo(); machine_crash_shutdown(&fixed_regs); @@ -1082,6 +1087,64 @@ void crash_kexec(struct pt_regs *regs) } } +size_t crash_get_memory_size(void) +{ + size_t size; + mutex_lock(&kexec_mutex); + size = crashk_res.end - crashk_res.start + 1; + mutex_unlock(&kexec_mutex); + return size; +} + +static void free_reserved_phys_range(unsigned long begin, unsigned long end) +{ + unsigned long addr; + + for (addr = begin; addr < end; addr += PAGE_SIZE) { + ClearPageReserved(pfn_to_page(addr >> PAGE_SHIFT)); + init_page_count(pfn_to_page(addr >> PAGE_SHIFT)); + free_page((unsigned long)__va(addr)); + totalram_pages++; + } +} + +int crash_shrink_memory(unsigned long new_size) +{ + int ret = 0; + unsigned long start, end; + + mutex_lock(&kexec_mutex); + + if (kexec_crash_image) { + ret = -ENOENT; + goto unlock; + } + start = crashk_res.start; + end = crashk_res.end; + + if (new_size >= end - start + 1) { + ret = -EINVAL; + if (new_size == end - start + 1) + ret = 0; + goto unlock; + } + + start = roundup(start, PAGE_SIZE); + end = roundup(start + new_size, PAGE_SIZE); + + free_reserved_phys_range(end, crashk_res.end); + + if (start == end) { + crashk_res.end = end; + release_resource(&crashk_res); + } else + crashk_res.end = end - 1; + +unlock: + mutex_unlock(&kexec_mutex); + return ret; +} + static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data, size_t data_len) { |