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Naoya Horiguchi ea251c1d5c pagemap: set pagemap walk limit to PMD boundary ... Currently one pagemap_read() call walks in PAGEMAP_WALK_SIZE bytes (== 512 pages.) But there is a corner case where walk_pmd_range() accidentally runs over a VMA associated with a hugetlbfs file. For example, when a process has mappings to VMAs as shown below: # cat /proc/<pid>/maps ... 3a58f6d000-3a58f72000 rw-p 00000000 00:00 0 7fbd51853000-7fbd51855000 rw-p 00000000 00:00 0 7fbd5186c000-7fbd5186e000 rw-p 00000000 00:00 0 7fbd51a00000-7fbd51c00000 rw-s 00000000 00:12 8614 /hugepages/test then pagemap_read() goes into walk_pmd_range() path and walks in the range 0x7fbd51853000-0x7fbd51a53000, but the hugetlbfs VMA should be handled by walk_hugetlb_range(). Otherwise PMD for the hugepage is considered bad and cleared, which causes undesirable results. This patch fixes it by separating pagemap walk range into one PMD. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		14 years ago
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Kconfig	vmcore: it is not experimental any more	15 years ago
Makefile	procfs: simplify conditional processing of fs/proc.o.	15 years ago
array.c	CRED: Fix get_task_cred() and task_state() to not resurrect dead credentials	15 years ago
base.c	signals: move cred_guard_mutex from task_struct to signal_struct	15 years ago
cmdline.c	…
cpuinfo.c	…
devices.c	…
generic.c	remove inode_setattr	15 years ago
inode.c	BKL: remove extraneous #include <smp_lock.h>	14 years ago
internal.h	proc: rename de_get() to pde_get() and inline it	15 years ago
interrupts.c	…
kcore.c	kcore: add _text to KCORE_TEXT	15 years ago
kmsg.c	procfs: Use generic_file_llseek in /proc/kmsg	15 years ago
loadavg.c	…
meminfo.c	hwpoison: fix/proc/meminfo alignment	16 years ago
mmu.c	…
nommu.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
page.c	proc: export uncached bit properly in /proc/kpageflags	15 years ago
proc_devtree.c	of: Drop properties with "/" in their name	15 years ago
proc_net.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	15 years ago
proc_sysctl.c	fs: do not assign default i_ino in new_inode	15 years ago
proc_tty.c	Revert "tty: Add a new file /proc/tty/consoles"	15 years ago
root.c	switch procfs to ->mount()	15 years ago
softirqs.c	procfs: fix /proc/softirqs formatting	15 years ago
stat.c	/proc/stat: fix scalability of irq sum of all cpu	15 years ago
task_mmu.c	pagemap: set pagemap walk limit to PMD boundary	14 years ago
task_nommu.c	nommu: add '[stack]' label to /proc/pid/maps output	15 years ago
uptime.c	[PATCH] Fix idle time field in /proc/uptime	16 years ago
version.c	…
vmcore.c	/proc/vmcore: fix seeking	15 years ago