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linux_dsm_epyc7002/arch/powerpc/kernel
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Linus Torvalds 89f5b7da2a Reinstate ZERO_PAGE optimization in 'get_user_pages()' and fix XIP 
KAMEZAWA Hiroyuki and Oleg Nesterov point out that since the commit
557ed1fa26 ("remove ZERO_PAGE") removed
the ZERO_PAGE from the VM mappings, any users of get_user_pages() will
generally now populate the VM with real empty pages needlessly.

We used to get the ZERO_PAGE when we did the "handle_mm_fault()", but
since fault handling no longer uses ZERO_PAGE for new anonymous pages,
we now need to handle that special case in follow_page() instead.

In particular, the removal of ZERO_PAGE effectively removed the core
file writing optimization where we would skip writing pages that had not
been populated at all, and increased memory pressure a lot by allocating
all those useless newly zeroed pages.

This reinstates the optimization by making the unmapped PTE case the
same as for a non-existent page table, which already did this correctly.

While at it, this also fixes the XIP case for follow_page(), where the
caller could not differentiate between the case of a page that simply
could not be used (because it had no "struct page" associated with it)
and a page that just wasn't mapped.

We do that by simply returning an error pointer for pages that could not
be turned into a "struct page *".  The error is arbitrarily picked to be
EFAULT, since that was what get_user_pages() already used for the
equivalent IO-mapped page case.

[ Also removed an impossible test for pte_offset_map_lock() failing:
  that's not how that function works ]

Acked-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Nick Piggin <npiggin@suse.de>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-06-20 11:18:25 -07:00
..
vdso32 [POWERPC] vdso: Fixes for cache block sizes 2007-11-20 13:56:31 +11:00
vdso64 [POWERPC] vdso: Fixes for cache block sizes 2007-11-20 13:56:31 +11:00
align.c [POWERPC] Handle alignment faults on SPE load/store instructions 2007-09-14 08:51:48 -05:00
asm-offsets.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-04-29 08:19:14 -07:00
audit.c [PATCH] audit signal recipients 2007-05-11 05:38:25 -04:00
btext.c [POWERPC] Remove duplicate #include 2008-05-09 20:22:58 +10:00
clock.c [POWERPC] clk.h interface for platforms 2007-10-03 09:11:56 +10:00
compat_audit.c [PATCH] add SIGNAL syscall class (v3) 2007-05-11 05:38:25 -04:00
cpu_setup_6xx.S [POWERPC] ppc32: Fix errata for 603 CPUs 2008-04-21 15:00:32 -05:00
cpu_setup_44x.S [POWERPC] 4xx: Fix 460GT support to not enable FPU 2008-04-24 13:32:47 -05:00
cpu_setup_pa6t.S [POWERPC] pasemi: Enable one more hid bit 2007-04-24 21:31:49 +10:00
cpu_setup_ppc970.S [POWERPC] powerpc: Enable DEEPNAP power savings mode on 970MP 2006-10-16 16:32:25 +10:00
cputable.c [POWERPC] Fix default cputable entries for e200 and e500 families 2008-05-12 14:20:35 +10:00
crash_dump.c [LIB]: Make PowerPC LMB code generic so sparc64 can use it too. 2008-02-13 16:56:49 -08:00
crash.c [LIB]: Make PowerPC LMB code generic so sparc64 can use it too. 2008-02-13 16:56:49 -08:00
dma_64.c iommu sg: powerpc: convert iommu to use the IOMMU helper 2008-02-05 09:44:11 -08:00
entry_32.S [POWERPC] Add IRQSTACKS support on ppc32 2008-04-29 15:57:34 +10:00
entry_64.S [POWERPC] irqtrace support for 64-bit powerpc 2008-04-18 15:38:47 +10:00
firmware.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
fpu.S [POWERPC] Restore copyright notice in arch/powerpc/kernel/fpu.S 2006-08-30 14:45:35 +10:00
head_8xx.S [POWERPC] 8xx: fix swap 2008-03-07 08:42:28 -06:00
head_32.S [POWERPC] Move stackframe definitions to common header 2008-04-18 15:37:18 +10:00
head_40x.S [POWERPC] Fix swapper_pg_dir size when CONFIG_PTE_64BIT=y on FSL_BOOKE 2007-12-06 13:11:04 -06:00
head_44x.S [POWERPC] 4xx: Clear new TLB cache attribute bits in Data Storage vector 2008-06-18 21:40:43 +10:00
head_64.S [POWERPC] Fix bogus paca->_current initialization 2008-05-09 20:22:58 +10:00
head_booke.h [POWERPC] Rework Book-E debug exception handling 2008-04-17 01:01:36 -05:00
head_fsl_booke.S [POWERPC] 85xx: Add support for relocatable kernel (and booting at non-zero) 2008-04-24 20:58:01 +10:00
ibmebus.c [POWERPC] Replace remaining __FUNCTION__ occurrences 2008-04-01 20:43:09 +11:00
idle_6xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
idle_power4.S [POWERPC] powermac: Support G5 CPU hotplug 2007-05-07 20:31:13 +10:00
idle.c [POWERPC] Fix sysctl table check failure on PowerMac 2007-11-08 14:15:30 +11:00
init_task.c [PATCH] take init_files to fs/file.c 2008-05-16 17:22:20 -04:00
io.c [POWERPC] Move inline asm eieio to using eieio inline function 2007-07-10 00:33:14 -05:00
iomap.c [POWERPC] Add 64-bit resources support to pci_iomap 2007-09-20 07:36:52 -05:00
iommu.c [POWERPC] Replace remaining __FUNCTION__ occurrences 2008-04-01 20:43:09 +11:00
irq.c [POWERPC] Fix return value check logic in debugfs virq_mapping setup 2008-06-16 15:00:25 +10:00
isa-bridge.c [POWERPC] Remove leftover printk in isa-bridge.c 2008-05-09 20:22:59 +10:00
kprobes.c [POWERPC] Kill sparse warnings in kprobes 2008-02-20 13:33:37 +11:00
l2cr_6xx.S Convert files to UTF-8 and some cleanups 2007-10-19 23:21:04 +02:00
legacy_serial.c [POWERPC] Fix legacy serial search for opb bus ports 2008-02-06 16:30:00 +11:00
lparcfg.c powerpc: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
machine_kexec_32.c Storage class should be first 2006-06-26 18:57:34 +02:00
machine_kexec_64.c [POWERPC] Rename get_property to of_get_property: arch/powerpc 2007-04-13 03:55:19 +10:00
machine_kexec.c [POWERPC] Fix crashkernel= handling when no crashkernel= specified 2008-04-30 19:49:48 +10:00
Makefile [POWERPC] ppc: Don't run prom_init_check for arch/ppc builds 2008-05-12 20:27:50 +10:00
misc_32.S [POWERPC] Add IRQSTACKS support on ppc32 2008-04-29 15:57:34 +10:00
misc_64.S [POWERPC] Clean up misc_64.S 2008-04-24 20:58:03 +10:00
misc.S [POWERPC] Make setjmp/longjmp code usable outside of xmon 2008-01-25 22:52:50 +11:00
module_32.c [POWERPC] Optimize counting distinct entries in the relocation sections 2007-12-21 15:05:58 +11:00
module_64.c [POWERPC] Optimize counting distinct entries in the relocation sections 2007-12-21 15:05:58 +11:00
msi.c [POWERPC] PowerPC MSI infrastructure 2007-05-08 13:40:31 +10:00
nvram_64.c [POWERPC] pseries: Eliminate global error_log_cnt variable 2007-08-17 11:01:52 +10:00
of_device.c [POWERPC] Use <linux/of_{platform, device}.h> and not <asm/...> variants. 2008-01-17 14:58:57 +11:00
of_platform.c [POWERPC] cell: Generalize io-workarounds code 2008-04-24 21:08:12 +10:00
paca.c [POWERPC] Raise the upper limit of NR_CPUS and move the pacas into the BSS 2008-04-24 20:58:04 +10:00
pci_32.c [POWERPC] Remove update_bridge_resource 2008-01-23 19:32:30 -06:00
pci_64.c [POWERPC] Use dev_set_name in pci_64.c 2008-06-09 11:32:40 +10:00
pci_dn.c [POWERPC] iSeries: eliminate pci_dn bussubno 2008-01-17 14:57:05 +11:00
pci-common.c PCI: powerpc: use generic pci_enable_resources() 2008-04-20 21:47:05 -07:00
pmc.c [POWERPC] Made FSL Book-E PMC support more generic 2008-02-05 23:34:14 -06:00
ppc32.h Revert "[POWERPC] Add compat handler for PTRACE_GETSIGINFO" 2008-04-24 14:05:15 +10:00
ppc_ksyms.c [POWERPC] Remove ppc32's export of console_drivers 2008-06-16 15:00:56 +10:00
proc_ppc64.c powerpc: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
process.c [POWERPC] Add IRQSTACKS support on ppc32 2008-04-29 15:57:34 +10:00
prom_init_check.sh [POWERPC] Fix -Os kernel builds with newer gcc versions 2008-06-16 15:00:54 +10:00
prom_init.c [POWERPC] Efika: Really, don't pretend to be CHRP 2008-04-17 07:46:12 +10:00
prom_parse.c [POWERPC] Add of_translate_dma_address 2007-12-11 15:43:35 +11:00
prom.c [POWERPC] 85xx: Add support for relocatable kernel (and booting at non-zero) 2008-04-24 20:58:01 +10:00
ptrace32.c Revert "[POWERPC] Add compat handler for PTRACE_GETSIGINFO" 2008-04-24 14:05:15 +10:00
ptrace.c [POWERPC] user_regset PTRACE_SETREGS regression fix 2008-03-20 10:10:56 +11:00
rtas_flash.c powerpc: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
rtas_pci.c [POWERPC] Convert pci and eeh code to of_device_is_available 2008-04-07 13:49:25 +10:00
rtas-proc.c powerpc: use non-racy method for proc entries creation 2008-04-29 08:06:22 -07:00
rtas-rtc.c [PATCH] powerpc: reorg RTAS delay code 2006-06-09 21:21:06 +10:00
rtas.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-04-21 15:50:49 -07:00
setup_32.c [POWERPC] Add IRQSTACKS support on ppc32 2008-04-29 15:57:34 +10:00
setup_64.c [POWERPC] Initialize lockdep earlier 2008-05-09 20:22:58 +10:00
setup-common.c [POWERPC] Add 'model: ...' line to common show_cpuinfo() 2008-03-26 08:44:04 +11:00
setup.h [PATCH] powerpc: Make early xmon logic immune to location of early parsing 2006-05-19 15:02:12 +10:00
signal_32.c [POWERPC] Define copy_siginfo_from_user32 2008-04-20 13:03:36 +10:00
signal_64.c [POWERPC] Fix incorrect enabling of VMX when building signal or user context 2008-06-09 11:32:36 +10:00
signal.c [POWERPC] Implement logging of unhandled signals 2007-10-12 14:05:18 +10:00
signal.h [POWERPC] Less ifdef's in signal.c/signal.h 2007-06-14 22:29:58 +10:00
smp-tbsync.c [POWERPC] Replace kmalloc+memset with kzalloc 2006-12-04 20:42:09 +11:00
smp.c [POWERPC] Bolt in SLB entry for kernel stack on secondary cpus 2008-05-02 15:00:45 +10:00
softemu8xx.c [POWERPC] 8xx: Move softemu8xx.c from arch/ppc 2007-10-04 11:02:54 -05:00
stacktrace.c [POWERPC] Fix new warnings arising from stacktrace patch 2008-04-24 20:58:02 +10:00
suspend.c [PATCH] x86: Move swsusp __pa() dependent code to arch portion 2007-05-02 19:27:07 +02:00
swsusp_32.S [POWERPC] Make altivec code in swsusp_32.S depend on CONFIG_ALTIVEC 2007-11-08 14:15:34 +11:00
swsusp_64.c [POWERPC] powermac: Suspend to disk on G5 2007-05-07 20:31:14 +10:00
swsusp_asm64.S [POWERPC] powermac: Suspend to disk on G5 2007-05-07 20:31:14 +10:00
swsusp.c powerpc: fixup hard_irq_disable semantics 2007-05-11 08:29:34 -07:00
sys_ppc32.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-04-21 15:50:49 -07:00
syscalls.c unified (weak) sys_pipe implementation 2008-05-03 13:50:33 -07:00
sysfs.c remove __attribute_used__ 2008-01-28 23:21:18 +01:00
systbl_chk.c [POWERPC] Fix a couple of copyright symbols 2008-01-25 22:52:50 +11:00
systbl_chk.sh [POWERPC] Fix a couple of copyright symbols 2008-01-25 22:52:50 +11:00
systbl.S [POWERPC] Align the sys_call_table 2007-10-11 14:36:47 +10:00
tau_6xx.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
time.c ntp: rename TICK_LENGTH_SHIFT to NTP_SCALE_SHIFT 2008-05-01 08:03:59 -07:00
traps.c [POWERPC] Fix compilation for CONFIG_DEBUGGER=n and CONFIG_KEXEC=y 2008-02-07 11:40:18 +11:00
udbg_16550.c [POWERPC] 4xx: Add early udbg support for 40x processors 2007-12-23 13:13:03 -06:00
udbg.c [POWERPC] Mark udbg console as CON_ANYTIME, ie. callable early in boot 2008-04-24 21:08:11 +10:00
vdso.c Reinstate ZERO_PAGE optimization in 'get_user_pages()' and fix XIP 2008-06-20 11:18:25 -07:00
vecemu.c [PATCH] powerpc: Move arch/ppc*/kernel/vecemu.c to arch/powerpc 2005-09-21 19:21:07 +10:00
vector.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
vio.c [POWERPC] Replace remaining __FUNCTION__ occurrences 2008-04-01 20:43:09 +11:00
vmlinux.lds.S [POWERPC] Update linker script to properly set physical addresses 2008-04-17 07:46:14 +10:00