On Tue 2014-09-09 00:52:55, Rafael J. Wysocki wrote: > On Monday, August 11, 2014 06:50:52 PM Lee, Chun-Yi wrote: > > In arch/x86/kernel/setup.c::trim_bios_range(), the codes introduced > > by 1b5576e6 (base on d8a9e6a5), it updates the first 4Kb of memory > > to be E820_RESERVED region. That's because it's a BIOS owned area > > but generally not listed in the E820 table: > > > > [ 0.000000] e820: BIOS-provided physical RAM map: > > [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x0000000000096fff] usable > > [ 0.000000] BIOS-e820: [mem 0x0000000000097000-0x0000000000097fff] > > reserved > > ... > > [ 0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved > > [ 0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable > > > > But the region of first 4Kb didn't register to nosave memory: > > > > [ 0.000000] PM: Registered nosave memory: [mem 0x00097000-0x00097fff] > > [ 0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000fffff] > > > > The codes in e820_mark_nosave_regions() assumes the first e820 area to be > > RAM, so it causes the first 4Kb E820_RESERVED region ignored when register > > to nosave. This patch removed assumption of the first e820 area. > > > > Cc: "Rafael J. Wysocki" <r...@rjwysocki.net> > > Cc: Len Brown <len.br...@intel.com> > > Cc: Pavel Machek <pa...@ucw.cz> > > Cc: Thomas Gleixner <t...@linutronix.de> > > Cc: Ingo Molnar <mi...@redhat.com> > > Cc: "H. Peter Anvin" <h...@zytor.com> > > Signed-off-by: Lee, Chun-Yi <j...@suse.com>
Acked-by: Pavel Machek <pa...@ucw.cz> -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
