Zhang Yanfei <zhangyanfei.yes at gmail.com> writes: > /dev/oldmem provides the interface for us to access the "old memory" in > the dump-capture kernel. Unfortunately, no one actually uses this interface. > > And this interface could actually cause some real problems if used on ia64 > where the cached/uncached accesses are mixed. See the discussion from > the link: https://lkml.org/lkml/2013/4/12/386. > > So Eric suggested that we should remove /dev/oldmem as an unused piece of > code. > > Besides, we used a global variable saved_max_pfn to let the capture kernel > know the amount of memory that the previous kernel used. And for almost all > architectures (except x86. In x86, saved_max_pfn is used by detect_calgary()), > the only user of this variable is the read_oldmem interface of /dev/oldmem, so > also remove the setting for saved_max_pfn in those architectures. Except for the devices.txt update. Acked-by: "Eric W. Biederman" <ebiederm at xmission.com> > Zhang Yanfei (7): > /dev/oldmem: Remove this interface > Documentation/devices.txt: Remove /dev/oldmem description > Documentation/kdump/kdump.txt: Remove /dev/oldmem description > mips: Remove savemaxmem parameter setup > powerpc: Remove savemaxmem parameter setup > ia64: Remove setting for saved_max_pfn > s390: Remove setting for saved_max_pfn > > Documentation/devices.txt | 2 - > Documentation/kdump/kdump.txt | 31 +++++-------------------- > arch/ia64/kernel/efi.c | 5 ---- > arch/mips/kernel/crash_dump.c | 10 -------- > arch/powerpc/kernel/crash_dump.c | 10 -------- > arch/s390/kernel/setup.c | 4 --- > drivers/char/mem.c | 47 -------------------------------------- > 7 files changed, 6 insertions(+), 103 deletions(-)
