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SubjectRe: mmotm 2009-09-09-22-56 uploaded
On Tue, 29 Sep 2009 11:49:39 +0530 Suresh Jayaraman <sjayaraman@suse.de> wrote:

> Hi all,
>
> On Thu, Sep 10, 2009 at 11:31 AM, <akpm@linux-foundation.org> wrote:
> > The mm-of-the-moment snapshot 2009-09-09-22-56 has been uploaded to
> >
> > http://userweb.kernel.org/~akpm/mmotm/
> >
> > and will soon be available at
> >
> > git://git.zen-sources.org/zen/mmotm.git
> >
>
> With this snapshot plus fixes, I'm unable to limit the memory using the
> kernel command line switch "mem=nn" on a x86_64 box. Is this the
> expected behavior?
>
> Using "cgroup_disable=memory" together with "mem=nn" switch didn't help.
> Am I supposed to use some other switch along with this?
>

hm, perhaps that -mm was needing this?


commit eda6da9286ad5b35b1eb70f6368958a8ee41a9dd
Author: Yinghai Lu <yinghai@kernel.org>
AuthorDate: Sat Sep 19 11:07:57 2009 -0700
Commit: Ingo Molnar <mingo@elte.hu>
CommitDate: Sat Sep 19 20:31:33 2009 +0200

Revert 'x86: Fix system crash when loading with "reservetop" parameter'

After close looking, commit 8126dec3 will break:

1. some cpu feature in early stage too, like cpu_has_x2apic
2. will break built-in-command line
3. will break other memmap= and mem=
4. early_dbgp and early_console that will use early_ioremap to access mmio (?)

So revert it.

Reported-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Cc: Andrew Morton <akpm@linux-foundation.org>,
LKML-Reference: <4AB51DFD.2000904@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 19f15c4..f5baa2a 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -712,21 +712,6 @@ void __init setup_arch(char **cmdline_p)
printk(KERN_INFO "Command line: %s\n", boot_command_line);
#endif

- strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
- *cmdline_p = command_line;
-
-#ifdef CONFIG_X86_64
- /*
- * Must call this twice: Once just to detect whether hardware doesn't
- * support NX (so that the early EHCI debug console setup can safely
- * call set_fixmap(), and then again after parsing early parameters to
- * honor the respective command line option.
- */
- check_efer();
-#endif
-
- parse_early_param();
-
/* VMI may relocate the fixmap; do this before touching ioremap area */
vmi_init();

@@ -809,6 +794,21 @@ void __init setup_arch(char **cmdline_p)
#endif
#endif

+ strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
+ *cmdline_p = command_line;
+
+#ifdef CONFIG_X86_64
+ /*
+ * Must call this twice: Once just to detect whether hardware doesn't
+ * support NX (so that the early EHCI debug console setup can safely
+ * call set_fixmap(), and then again after parsing early parameters to
+ * honor the respective command line option.
+ */
+ check_efer();
+#endif
+
+ parse_early_param();
+
#ifdef CONFIG_X86_64
check_efer();
#endif


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