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23 October 2021, 00:29:24 UTC
Revision 701270fa193aadf00bdcf607738f64997275d4c7 authored by Hugh Dickins on 30 November 2018, 22:10:25 UTC, committed by Linus Torvalds on 30 November 2018, 22:56:15 UTC 
mm/khugepaged: collapse_shmem() stop if punched or truncated
 
Huge tmpfs testing showed that although collapse_shmem() recognizes a
concurrently truncated or hole-punched page correctly, its handling of
holes was liable to refill an emptied extent.  Add check to stop that.

Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1811261522040.2275@eggly.anvils
Fixes: f3f0e1d2150b2 ("khugepaged: add support of collapse for tmpfs/shmem pages")
Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Matthew Wilcox <willy@infradead.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: <stable@vger.kernel.org>	[4.8+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 006d3ff
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Tip revision: 701270fa193aadf00bdcf607738f64997275d4c7 authored by Hugh Dickins on 30 November 2018, 22:10:25 UTC
mm/khugepaged: collapse_shmem() stop if punched or truncated
Tip revision: 701270f
Makefile.kcov 
ifdef CONFIG_KCOV

kcov-flags-$(CONFIG_CC_HAS_SANCOV_TRACE_PC)	+= -fsanitize-coverage=trace-pc
kcov-flags-$(CONFIG_KCOV_ENABLE_COMPARISONS)	+= -fsanitize-coverage=trace-cmp
kcov-flags-$(CONFIG_GCC_PLUGIN_SANCOV)		+= -fplugin=$(objtree)/scripts/gcc-plugins/sancov_plugin.so

export CFLAGS_KCOV := $(kcov-flags-y)

endif
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