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john.hubbard@gmail.com 494eec70f0 mm: page_cache_add_speculative(): refactor out some code duplication 
From: John Hubbard <jhubbard@nvidia.com>

This combines the common elements of these routines:

    page_cache_get_speculative()
    page_cache_add_speculative()

This was anticipated by the original author, as shown by the comment in
commit ce0ad7f095 ("powerpc/mm: Lockless get_user_pages_fast() for
64-bit (v3)"):

    "Same as above, but add instead of inc (could just be merged)"

There is no intention to introduce any behavioral change, but there is a
small risk of that, due to slightly differing ways of expressing the
TINY_RCU and related configurations.

This also removes the VM_BUG_ON(in_interrupt()) that was in
page_cache_add_speculative(), but not in page_cache_get_speculative().
This provides slightly less detection of such bugs, but it given that it
was only there on the "add" path anyway, we can likely do without it
just fine.

And it removes the
VM_BUG_ON_PAGE(PageCompound(page) && page != compound_head(page), page);
that page_cache_add_speculative() had.

Link: http://lkml.kernel.org/r/20190206231016.22734-2-jhubbard@nvidia.com
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-03-05 21:07:20 -08:00
..
acpi
asm-generic mm: update ptep_modify_prot_commit to take old pte value as arg 2019-03-05 21:07:18 -08:00
clocksource
crypto crypto: export arc4 defines 2019-02-15 13:21:55 +08:00
drm Merge tag 'drm-intel-fixes-2019-01-11' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes 2019-01-11 10:26:21 +01:00
dt-bindings Here's the main MIPS pull request for v5.1: 2019-03-05 11:28:25 -08:00
keys KEYS: user: Align the payload buffer 2019-02-22 10:11:19 -08:00
kvm KVM: arm/arm64: vgic: Make vgic_cpu->ap_list_lock a raw_spinlock 2019-01-24 15:09:09 +01:00
linux mm: page_cache_add_speculative(): refactor out some code duplication 2019-03-05 21:07:20 -08:00
math-emu
media
memory
misc
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-03-04 13:26:15 -08:00
pcmcia
ras
rdma RDMA/device: Expose ib_device_try_get(() 2019-01-21 14:33:08 -07:00
scsi
soc soc: fsl: dpio: add a device_link at dpaa2_io_service_register 2019-01-11 15:06:54 -06:00
sound ALSA: compress: Fix stop handling on compressed capture streams 2019-02-05 22:01:41 +01:00
target
trace Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-03-05 08:26:13 -08:00
uapi mm/memfd: add an F_SEAL_FUTURE_WRITE seal to memfd 2019-03-05 21:07:19 -08:00
video
xen arm64/xen: fix xen-swiotlb cache flushing 2019-01-23 22:14:56 +01:00