David Hildenbrand dc9e6f7053 mm: read page_type using READ_ONCE ... KCSAN complains about possible data races: while we check for a page_type -- for example for sanity checks -- we might concurrently modify the mapcount that overlays page_type. Let's use READ_ONCE to avoid load tearing (shouldn't make a difference) and to make KCSAN happy. Likely, we might also want to use WRITE_ONCE for the writer side of page_type, if KCSAN ever complains about that. But we'll not mess with that for now. Note: nothing should really be broken besides wrong KCSAN complaints. The sanity check that triggers this was added in commit 68f0320824 ("mm/rmap: convert folio_add_file_rmap_range() into folio_add_file_rmap_[pte|ptes|pmd]()"). Even before that similar races likely where possible, ever since we added page_type in commit 6e292b9be7 ("mm: split page_type out from _mapcount"). Link: https://lkml.kernel.org/r/20240531125616.2850153-1-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Reported-by: kernel test robot <oliver.sang@intel.com> Closes: https://lore.kernel.org/oe-lkp/202405281431.c46a3be9-lkp@intel.com Reviewed-by: Oscar Salvador <osalvador@suse.de> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2024-07-03 19:30:20 -07:00
..
acpi	ACPI: EC: Evaluate orphan _REG under EC device	2024-06-13 11:28:54 +02:00
asm-generic	syscalls: mmap(): use unsigned offset type consistently	2024-06-25 15:57:38 +02:00
clocksource
crypto	This push fixes a bug in the new ecc P521 code as well as a buggy	2024-05-20 08:47:54 -07:00
drm	Short summary of fixes pull:	2024-05-27 13:47:14 +10:00
dt-bindings	dt-bindings: net: dp8386x: Add MIT license along with GPL-2.0	2024-06-07 12:16:22 +01:00
keys
kunit
kvm
linux	mm: read page_type using READ_ONCE	2024-07-03 19:30:20 -07:00
math-emu
media
memory
misc
net	netfilter pull request 24-06-27	2024-06-27 13:00:50 +02:00
pcmcia
ras	mm/memory-failure: remove MF_MSG_SLAB	2024-07-03 19:30:10 -07:00
rdma	The usual shower of singleton fixes and minor series all over MM,	2024-05-19 09:21:03 -07:00
rv
scsi	scsi: core: Introduce the BLIST_SKIP_IO_HINTS flag	2024-06-13 21:03:13 -04:00
soc	I'm actually surprised this time. There aren't any new Qualcomm SoC clk	2024-05-18 12:48:37 -07:00
sound	ALSA: dmaengine: Synchronize dma channel after drop()	2024-06-11 17:13:31 +01:00
target
trace	mm/migrate: add MR_DAMON to migrate_reason	2024-07-03 19:30:12 -07:00
uapi	syscalls: fix compat_sys_io_pgetevents_time64 usage	2024-06-25 15:57:20 +02:00
ufs
vdso
video
xen