linux/arch/powerpc
Kirill A. Shutemov c164e038ee mm: fix huge zero page accounting in smaps report
As a small zero page, huge zero page should not be accounted in smaps
report as normal page.

For small pages we rely on vm_normal_page() to filter out zero page, but
vm_normal_page() is not designed to handle pmds.  We only get here due
hackish cast pmd to pte in smaps_pte_range() -- pte and pmd format is not
necessary compatible on each and every architecture.

Let's add separate codepath to handle pmds.  follow_trans_huge_pmd() will
detect huge zero page for us.

We would need pmd_dirty() helper to do this properly.  The patch adds it
to THP-enabled architectures which don't yet have one.

[akpm@linux-foundation.org: use do_div to fix 32-bit build]
Signed-off-by: "Kirill A. Shutemov" <kirill@shutemov.name>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Tested-by: Fengwei Yin <yfw.kernel@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-12-10 17:41:08 -08:00
..
boot Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux 2014-10-11 20:34:00 -04:00
configs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux 2014-10-21 07:48:56 -07:00
crypto
include mm: fix huge zero page accounting in smaps report 2014-12-10 17:41:08 -08:00
kernel ARM: SoC driver updates for 3.19 2014-12-09 14:48:22 -08:00
kvm Fixes and features for 3.18. 2014-10-08 05:27:39 -04:00
lib powerpc: Implement emulation of string loads and stores 2014-09-25 23:14:52 +10:00
math-emu powerpc: Correct emulated mtfsf instruction 2014-04-07 10:33:11 +10:00
mm arm64 updates for 3.19 2014-12-09 13:12:47 -08:00
net net: bpf: be friendly to kmemcheck 2014-09-09 16:58:56 -07:00
oprofile powerpc: Ensure global functions include their prototype 2014-09-25 23:14:42 +10:00
perf perf: Fix and clean up initialization of pmu::event_idx 2014-10-28 10:51:01 +01:00
platforms Merge branch 'irq-irqdomain-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-12-10 09:01:01 -08:00
sysdev Merge branch 'irq-irqdomain-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-12-10 09:01:01 -08:00
xmon powerpc/pseries: Fix endiannes issue in RTAS call from xmon 2014-11-27 09:32:57 +11:00
Kconfig powerpc/cell: Move spu_handle_mm_fault() out of cell platform 2014-10-08 20:14:54 +11:00
Kconfig.debug Patch queue for ppc - 2014-08-01 2014-08-05 09:58:11 +02:00
Makefile powerpc: Add POWER8 CPU selection 2014-09-25 23:14:49 +10:00
relocs_check.pl