[patch 5/7] Use extended crashkernel command line on ppc64

[patch 5/7] Use extended crashkernel command line on ppc64

[Bernhard Walle]

This patch adapts the ppc64 code to use the generic parse_crashkernel()
function introduced in the generic patch of that series.


Signed-off-by: Bernhard Walle <bwalle@suse.de>

---
 arch/powerpc/kernel/machine_kexec.c |   52 ++++++++++++++++++------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -61,45 +61,39 @@ NORET_TYPE void machine_kexec(struct kim
 	for(;;);
 }
 
-static int __init early_parse_crashk(char *p)
+void __init reserve_crashkernel(void)
 {
-	unsigned long size;
-
-	if (!p)
-		return 1;
-
-	size = memparse(p, &p);
+	unsigned long long crash_size, crash_base;
+	int ret;
 
-	if (*p == '@')
-		crashk_res.start = memparse(p + 1, &p);
-	else
-		crashk_res.start = KDUMP_KERNELBASE;
-
-	crashk_res.end = crashk_res.start + size - 1;
-
-	return 0;
-}
-early_param("crashkernel", early_parse_crashk);
+	/* this is necessary because of lmb_phys_mem_size() */
+	lmb_analyze();
 
-void __init reserve_crashkernel(void)
-{
-	unsigned long size;
+	/* use common parsing */
+	ret = parse_crashkernel(boot_command_line, lmb_phys_mem_size(),
+			&crash_size, &crash_base);
+	if (ret == 0 && crash_size > 0) {
+		if (crash_base == 0)
+			crash_base = KDUMP_KERNELBASE;
+		crashk_res.start = crash_base;
+	} else {
+		/* handle the device tree */
+		crash_size = crashk_res.end - crashk_res.start + 1;
+	}
 
-	if (crashk_res.start == 0)
+	if (crash_size == 0)
 		return;
 
 	/* We might have got these values via the command line or the
 	 * device tree, either way sanitise them now. */
 
-	size = crashk_res.end - crashk_res.start + 1;
-
 	if (crashk_res.start != KDUMP_KERNELBASE)
 		printk("Crash kernel location must be 0x%x\n",
 				KDUMP_KERNELBASE);
 
 	crashk_res.start = KDUMP_KERNELBASE;
-	size = PAGE_ALIGN(size);
-	crashk_res.end = crashk_res.start + size - 1;
+	crash_size = PAGE_ALIGN(crash_size);
+	crashk_res.end = crashk_res.start + crash_size - 1;
 
 	/* Crash kernel trumps memory limit */
 	if (memory_limit && memory_limit <= crashk_res.end) {
@@ -108,7 +102,13 @@ void __init reserve_crashkernel(void)
 				memory_limit);
 	}
 
-	lmb_reserve(crashk_res.start, size);
+	printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
+			"for crashkernel (System RAM: %ldMB)\n",
+			(unsigned long)(crash_size >> 20),
+			(unsigned long)(crashk_res.start >> 20),
+			(unsigned long)(lmb_phys_mem_size() >> 20));
+
+	lmb_reserve(crashk_res.start, crash_size);
 }
 
 int overlaps_crashkernel(unsigned long start, unsigned long size)

-- 

Re: [patch 5/7] Use extended crashkernel command line on ppc64

[Andrew Morton]

On Tue, 25 Sep 2007 20:23:02 +0200 Bernhard Walle <bwalle@suse.de> wrote:

> This patch adapts the ppc64 code to use the generic parse_crashkernel()
> function introduced in the generic patch of that series.
> 
> 

I really don't like to see patches get a wholesale replacement, especially
when they've been looked at by a few people and have had some testing, etc.
It's not possible to see what changed and people need to re-review stuff
they've already reviewed, etc.

So I almost always undo this mess, turn the patches back into incremental
ones, see what pops out.

This patch is actually:


diff -puN arch/powerpc/kernel/machine_kexec.c~use-extended-crashkernel-command-line-on-ppc64-update arch/powerpc/kernel/machine_kexec.c
--- a/arch/powerpc/kernel/machine_kexec.c~use-extended-crashkernel-command-line-on-ppc64-update
+++ a/arch/powerpc/kernel/machine_kexec.c
@@ -63,7 +63,7 @@ NORET_TYPE void machine_kexec(struct kim
 
 void __init reserve_crashkernel(void)
 {
-	unsigned long long crash_size = 0, crash_base;
+	unsigned long long crash_size, crash_base;
 	int ret;
 
 	/* this is necessary because of lmb_phys_mem_size() */
_


which I suspect will now create a compiler warning.


	unsigned long long crash_size, crash_base;
	int ret;

	/* this is necessary because of lmb_phys_mem_size() */
	lmb_analyze();

	/* use common parsing */
	ret = parse_crashkernel(boot_command_line, lmb_phys_mem_size(),
			&crash_size, &crash_base);
	if (ret == 0 && crash_size > 0) {
		if (crash_base == 0)
			crash_base = KDUMP_KERNELBASE;
		crashk_res.start = crash_base;
	} else {
		/* handle the device tree */
		crash_size = crashk_res.end - crashk_res.start + 1;
	}

	if (crash_size == 0)
		return;

If so, the use of uninitialized_var() would be better than the unneeded
initialization-to-zero.

Re: [patch 5/7] Use extended crashkernel command line on ppc64

[Bernhard Walle]

Hi,

* Andrew Morton <akpm@linux-foundation.org> [2007-09-25 21:45]:
> On Tue, 25 Sep 2007 20:23:02 +0200 Bernhard Walle <bwalle@suse.de> wrote:
> 
> > This patch adapts the ppc64 code to use the generic parse_crashkernel()
> > function introduced in the generic patch of that series.
> 
> I really don't like to see patches get a wholesale replacement, especially
> when they've been looked at by a few people and have had some testing, etc.
> It's not possible to see what changed and people need to re-review stuff
> they've already reviewed, etc.

Sorry, I didn't know that this is the preferred way. I just thought
it's more clear if the patches are replaced if the patch set is
finally pushed into Linus' tree.

> diff -puN arch/powerpc/kernel/machine_kexec.c~use-extended-crashkernel-command-line-on-ppc64-update arch/powerpc/kernel/machine_kexec.c
> --- a/arch/powerpc/kernel/machine_kexec.c~use-extended-crashkernel-command-line-on-ppc64-update
> +++ a/arch/powerpc/kernel/machine_kexec.c
> @@ -63,7 +63,7 @@ NORET_TYPE void machine_kexec(struct kim
>  
>  void __init reserve_crashkernel(void)
>  {
> -	unsigned long long crash_size = 0, crash_base;
> +	unsigned long long crash_size, crash_base;
>  	int ret;
>  
>  	/* this is necessary because of lmb_phys_mem_size() */
> _
> 
> 
> which I suspect will now create a compiler warning.

No, it doesn't. I just verified this.

  CHK     include/linux/compile.h
  CC      arch/powerpc/kernel/machine_kexec.o
  LD      arch/powerpc/kernel/built-in.o


Thanks,
   Bernhard
-- 
Bernhard Walle <bwalle@suse.de>, Architecture Maintenance
SUSE LINUX Products GmbH, Nürnberg, Germany
GF: Markus Rex, HRB 16746 (AG Nürnberg)
OpenPGP: F61F 34CC 09CA FB82 C9F6  BA4B 8865 3696 DDAF 6454

[patch 5/7] Use extended crashkernel command line on ppc64

[Bernhard Walle]

This patch adapts the ppc64 code to use the generic parse_crashkernel()
function introduced in the generic patch of that series.


Signed-off-by: Bernhard Walle <bwalle@suse.de>

---
 arch/powerpc/kernel/machine_kexec.c |   52 ++++++++++++++++++------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -61,45 +61,39 @@ NORET_TYPE void machine_kexec(struct kim
 	for(;;);
 }
 
-static int __init early_parse_crashk(char *p)
+void __init reserve_crashkernel(void)
 {
-	unsigned long size;
-
-	if (!p)
-		return 1;
-
-	size = memparse(p, &p);
+	unsigned long long crash_size = 0, crash_base;
+	int ret;
 
-	if (*p == '@')
-		crashk_res.start = memparse(p + 1, &p);
-	else
-		crashk_res.start = KDUMP_KERNELBASE;
-
-	crashk_res.end = crashk_res.start + size - 1;
-
-	return 0;
-}
-early_param("crashkernel", early_parse_crashk);
+	/* this is necessary because of lmb_phys_mem_size() */
+	lmb_analyze();
 
-void __init reserve_crashkernel(void)
-{
-	unsigned long size;
+	/* use common parsing */
+	ret = parse_crashkernel(boot_command_line, lmb_phys_mem_size(),
+			&crash_size, &crash_base);
+	if (ret == 0 && crash_size > 0) {
+		if (crash_base == 0)
+			crash_base = KDUMP_KERNELBASE;
+		crashk_res.start = crash_base;
+	} else {
+		/* handle the device tree */
+		crash_size = crashk_res.end - crashk_res.start + 1;
+	}
 
-	if (crashk_res.start == 0)
+	if (crash_size == 0)
 		return;
 
 	/* We might have got these values via the command line or the
 	 * device tree, either way sanitise them now. */
 
-	size = crashk_res.end - crashk_res.start + 1;
-
 	if (crashk_res.start != KDUMP_KERNELBASE)
 		printk("Crash kernel location must be 0x%x\n",
 				KDUMP_KERNELBASE);
 
 	crashk_res.start = KDUMP_KERNELBASE;
-	size = PAGE_ALIGN(size);
-	crashk_res.end = crashk_res.start + size - 1;
+	crash_size = PAGE_ALIGN(crash_size);
+	crashk_res.end = crashk_res.start + crash_size - 1;
 
 	/* Crash kernel trumps memory limit */
 	if (memory_limit && memory_limit <= crashk_res.end) {
@@ -108,7 +102,13 @@ void __init reserve_crashkernel(void)
 				memory_limit);
 	}
 
-	lmb_reserve(crashk_res.start, size);
+	printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
+			"for crashkernel (System RAM: %ldMB)\n",
+			(unsigned long)(crash_size >> 20),
+			(unsigned long)(crashk_res.start >> 20),
+			(unsigned long)(lmb_phys_mem_size() >> 20));
+
+	lmb_reserve(crashk_res.start, crash_size);
 }
 
 int overlaps_crashkernel(unsigned long start, unsigned long size)

-- 

[patch 5/7] Use extended crashkernel command line on ppc64

[Bernhard Walle]

This patch adapts the ppc64 code to use the generic parse_crashkernel()
function introduced in the generic patch of that series.


Signed-off-by: Bernhard Walle <bwalle@suse.de>

---
 arch/powerpc/kernel/machine_kexec.c |   52 ++++++++++++++++++------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

--- a/arch/powerpc/kernel/machine_kexec.c
+++ b/arch/powerpc/kernel/machine_kexec.c
@@ -61,45 +61,39 @@ NORET_TYPE void machine_kexec(struct kim
 	for(;;);
 }
 
-static int __init early_parse_crashk(char *p)
+void __init reserve_crashkernel(void)
 {
-	unsigned long size;
-
-	if (!p)
-		return 1;
-
-	size = memparse(p, &p);
+	unsigned long long crash_size = 0, crash_base;
+	int ret;
 
-	if (*p == '@')
-		crashk_res.start = memparse(p + 1, &p);
-	else
-		crashk_res.start = KDUMP_KERNELBASE;
-
-	crashk_res.end = crashk_res.start + size - 1;
-
-	return 0;
-}
-early_param("crashkernel", early_parse_crashk);
+	/* this is necessary because of lmb_phys_mem_size() */
+	lmb_analyze();
 
-void __init reserve_crashkernel(void)
-{
-	unsigned long size;
+	/* use common parsing */
+	ret = parse_crashkernel(boot_command_line, lmb_phys_mem_size(),
+			&crash_size, &crash_base);
+	if (ret == 0 && crash_size > 0) {
+		if (crash_base == 0)
+			crash_base = KDUMP_KERNELBASE;
+		crashk_res.start = crash_base;
+	} else {
+		/* handle the device tree */
+		crash_size = crashk_res.end - crashk_res.start + 1;
+	}
 
-	if (crashk_res.start == 0)
+	if (crash_size == 0)
 		return;
 
 	/* We might have got these values via the command line or the
 	 * device tree, either way sanitise them now. */
 
-	size = crashk_res.end - crashk_res.start + 1;
-
 	if (crashk_res.start != KDUMP_KERNELBASE)
 		printk("Crash kernel location must be 0x%x\n",
 				KDUMP_KERNELBASE);
 
 	crashk_res.start = KDUMP_KERNELBASE;
-	size = PAGE_ALIGN(size);
-	crashk_res.end = crashk_res.start + size - 1;
+	crash_size = PAGE_ALIGN(crash_size);
+	crashk_res.end = crashk_res.start + crash_size - 1;
 
 	/* Crash kernel trumps memory limit */
 	if (memory_limit && memory_limit <= crashk_res.end) {
@@ -108,7 +102,13 @@ void __init reserve_crashkernel(void)
 				memory_limit);
 	}
 
-	lmb_reserve(crashk_res.start, size);
+	printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
+			"for crashkernel (System RAM: %ldMB)\n",
+			(unsigned long)(crash_size >> 20),
+			(unsigned long)(crashk_res.start >> 20),
+			(unsigned long)(lmb_phys_mem_size() >> 20));
+
+	lmb_reserve(crashk_res.start, crash_size);
 }
 
 int overlaps_crashkernel(unsigned long start, unsigned long size)

--