On Wed, Feb 02, 2011 at 03:43:29PM +0100, Per Fransson wrote: > When restarting using the kernel kexec functionality the MMU > needs to be turned off. Any code which does this needs to use > identity mapped addresses to get reliable results. In the ARM > kexec case this identity mapping is done: > > - using the page table of the current task > > - for all addresses normally used by user space, > i.e. 0x00000000-PAGE_OFFSET > > If kexec is used at a kernel crash to collect a core dump this > means that we lose important information. > > This is what this patches does: > > * Actually turns off the MMU, which has been omitted by mistake > > * Sets up a more selective identity mapping > > * Restores the old mapping once the MMU is off > > Signed-off-by: Per Fransson <per.xx.fransson at stericsson.com> > --- > v2 changes: > > * now uses (modified versions of) the identity mapping functions in idmap.c > as they look in 2.6.38-rc1. Some pud-level code has been added there in > linux-next. Thanks. As this been tested with ARMv4/v5 CPUs as well?
