Roman Gushchin a6375c9877 ext4: use non-movable memory for superblock readahead ... commit d87f639258 upstream. Since commit a8ac900b81 ("ext4: use non-movable memory for the superblock") buffers for ext4 superblock were allocated using the sb_bread_unmovable() helper which allocated buffer heads out of non-movable memory blocks. It was necessarily to not block page migrations and do not cause cma allocation failures. However commit 85c8f176a6 ("ext4: preload block group descriptors") broke this by introducing pre-reading of the ext4 superblock. The problem is that __breadahead() is using __getblk() underneath, which allocates buffer heads out of movable memory. It resulted in page migration failures I've seen on a machine with an ext4 partition and a preallocated cma area. Fix this by introducing sb_breadahead_unmovable() and __breadahead_gfp() helpers which use non-movable memory for buffer head allocations and use them for the ext4 superblock readahead. Reviewed-by: Andreas Dilger <adilger@dilger.ca> Fixes: 85c8f176a6 ("ext4: preload block group descriptors") Signed-off-by: Roman Gushchin <guro@fb.com> Link: https://lore.kernel.org/r/20200229001411.128010-1-guro@fb.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-04-23 10:30:12 +02:00
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acpi	ACPICA: Introduce ACPI_ACCESS_BYTE_WIDTH() macro	2020-03-05 16:42:17 +01:00
asm-generic
clocksource
crypto	crypto: chacha20 - Fix chacha20_block() keystream alignment (again)	2019-11-20 18:47:11 +01:00
drm	drm/panel: make drm_panel.h self-contained	2020-01-27 14:51:01 +01:00
dt-bindings	dt-bindings: reset: meson8b: fix duplicate reset IDs	2020-01-23 08:21:26 +01:00
keys
kvm
linux	ext4: use non-movable memory for superblock readahead	2020-04-23 10:30:12 +02:00
math-emu	math-emu/soft-fp.h: (_FP_ROUND_ZERO) cast 0 to void to fix warning	2019-12-13 08:51:34 +01:00
media	media: v4l2-device.h: Explicitly compare grp{id,mask} to zero in v4l2_device macros	2020-02-24 08:34:41 +01:00
memory
misc
net	net: ipv6: do not consider routes via gateways for anycast address check	2020-04-21 09:03:04 +02:00
pcmcia
ras
rdma	RDMA/uverbs: Verify MR access flags	2020-02-14 16:33:23 -05:00
scsi	scsi: Revert "target: iscsi: Wait for all commands to finish before freeing a session"	2020-02-28 16:38:58 +01:00
soc	soc/tegra: pmc: Fix pad voltage configuration for Tegra186	2019-11-20 18:45:24 +01:00
sound	ALSA: rawmidi: Avoid bit fields for state flags	2020-02-28 16:38:59 +01:00
target	scsi: target: fix hang when multiple threads try to destroy the same iscsi session	2020-04-21 09:03:11 +02:00
trace	afs: Fix some tracing details	2020-04-02 15:28:19 +02:00
uapi	uapi: rename ext2_swab() to swab() and share globally in swab.h	2020-04-17 10:48:43 +02:00
video
xen