The patch titled
Use extended crashkernel command line on x86_64
has been added to the -mm tree. Its filename is
use-extended-crashkernel-command-line-on-x86_64.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Use extended crashkernel command line on x86_64
From: Bernhard Walle <bwalle@xxxxxxx>
This patch removes the crashkernel parsing from
arch/x86_64/kernel/machine_kexec.c and calls the generic function, introduced
in the last patch, in setup_bootmem_allocator().
This is necessary because the amount of System RAM must be known in this
function now because of the new syntax.
Signed-off-by: Bernhard Walle <bwalle@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86_64/kernel/e820.c | 3 +-
arch/x86_64/kernel/machine_kexec.c | 27 --------------------
arch/x86_64/kernel/setup.c | 35 +++++++++++++++++++++------
3 files changed, 30 insertions(+), 35 deletions(-)
diff -puN arch/x86_64/kernel/e820.c~use-extended-crashkernel-command-line-on-x86_64 arch/x86_64/kernel/e820.c
--- a/arch/x86_64/kernel/e820.c~use-extended-crashkernel-command-line-on-x86_64
+++ a/arch/x86_64/kernel/e820.c
@@ -226,7 +226,8 @@ void __init e820_reserve_resources(void)
request_resource(res, &code_resource);
request_resource(res, &data_resource);
#ifdef CONFIG_KEXEC
- request_resource(res, &crashk_res);
+ if (crashk_res.start != crashk_res.end)
+ request_resource(res, &crashk_res);
#endif
}
}
diff -puN arch/x86_64/kernel/machine_kexec.c~use-extended-crashkernel-command-line-on-x86_64 arch/x86_64/kernel/machine_kexec.c
--- a/arch/x86_64/kernel/machine_kexec.c~use-extended-crashkernel-command-line-on-x86_64
+++ a/arch/x86_64/kernel/machine_kexec.c
@@ -231,33 +231,6 @@ NORET_TYPE void machine_kexec(struct kim
image->start);
}
-/* crashkernel=size@addr specifies the location to reserve for
- * a crash kernel. By reserving this memory we guarantee
- * that linux never set's it up as a DMA target.
- * Useful for holding code to do something appropriate
- * after a kernel panic.
- */
-static int __init setup_crashkernel(char *arg)
-{
- unsigned long size, base;
- char *p;
- if (!arg)
- return -EINVAL;
- size = memparse(arg, &p);
- if (arg == p)
- return -EINVAL;
- if (*p == '@') {
- base = memparse(p+1, &p);
- /* FIXME: Do I want a sanity check to validate the
- * memory range? Yes you do, but it's too early for
- * e820 -AK */
- crashk_res.start = base;
- crashk_res.end = base + size - 1;
- }
- return 0;
-}
-early_param("crashkernel", setup_crashkernel);
-
void arch_crash_save_vmcoreinfo(void)
{
#ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
diff -puN arch/x86_64/kernel/setup.c~use-extended-crashkernel-command-line-on-x86_64 arch/x86_64/kernel/setup.c
--- a/arch/x86_64/kernel/setup.c~use-extended-crashkernel-command-line-on-x86_64
+++ a/arch/x86_64/kernel/setup.c
@@ -196,6 +196,33 @@ static inline void copy_edd(void)
}
#endif
+#ifdef CONFIG_KEXEC
+static inline void reserve_crashkernel(void)
+{
+ unsigned long long free_mem;
+ unsigned long long crash_size, crash_base;
+ int ret;
+
+ free_mem = max_low_pfn << PAGE_SHIFT;
+
+ ret = parse_crashkernel(boot_command_line, free_mem,
+ &crash_size, &crash_base);
+ if (ret == 0 && crash_size > 0 && crash_base > 0) {
+ printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
+ "for crashkernel (System RAM: %ldMB)\n",
+ (unsigned long)(crash_size >> 20),
+ (unsigned long)(crash_base >> 20),
+ (unsigned long)(free_mem >> 20));
+ crashk_res.start = crash_base;
+ crashk_res.end = crash_base + crash_size - 1;
+ reserve_bootmem(crash_base, crash_size);
+ }
+}
+#else
+static inline void reserve_crashkernel(void)
+{}
+#endif
+
#define EBDA_ADDR_POINTER 0x40E
unsigned __initdata ebda_addr;
@@ -367,13 +394,7 @@ void __init setup_arch(char **cmdline_p)
}
}
#endif
-#ifdef CONFIG_KEXEC
- if (crashk_res.start != crashk_res.end) {
- reserve_bootmem_generic(crashk_res.start,
- crashk_res.end - crashk_res.start + 1);
- }
-#endif
-
+ reserve_crashkernel();
paging_init();
#ifdef CONFIG_PCI
_
Patches currently in -mm which might be from bwalle@xxxxxxx are
add-vmcoreinfo.patch
express-relocatability-of-kernel-on-x86_64-in-documentation.patch
express-relocatability-of-kernel-on-x86_64-in.patch
express-new-elf32-mechanisms-in-documentation.patch
add-reset_devices-to-the-recommended-parameters.patch
extended-crashkernel-command-line.patch
use-extended-crashkernel-command-line-on-i386.patch
use-extended-crashkernel-command-line-on-x86_64.patch
use-extended-crashkernel-command-line-on-ia64.patch
use-extended-crashkernel-command-line-on-ppc64.patch
use-extended-crashkernel-command-line-on-sh.patch
add-documentation-for-extended-crashkernel-syntax.patch
-
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