| Commit message (Collapse) | Author | Age | Files | Lines | |
|---|---|---|---|---|---|
| * | lib/div64.c: off by one in shift | Stanislaw Gruszka | 2019-05-03 | 1 | -2/+2 |
| | | | | | | | | | | | | | | | | | | | | | | [ Upstream commit cdc94a37493135e355dfc0b0e086d84e3eadb50d ] fls counts bits starting from 1 to 32 (returns 0 for zero argument). If we add 1 we shift right one bit more and loose precision from divisor, what cause function incorect results with some numbers. Corrected code was tested in user-space, see bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202391 Link: http://lkml.kernel.org/r/1548686944-11891-1-git-send-email-sgruszka@redhat.com Fixes: 658716d19f8f ("div64_u64(): improve precision on 32bit platforms") Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Reported-by: Siarhei Volkau <lis8215@gmail.com> Tested-by: Siarhei Volkau <lis8215@gmail.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> | ||||
| * | UPSTREAM: math64: New separate div64_u64_rem helper | Mike Snitzer | 2017-05-24 | 1 | -0/+40 |
| | | | | | | | | | | | | | | | | | | | | | | | Commit f792685006274a850e6cc0ea9ade275ccdfc90bc ("math64: New div64_u64_rem helper") implemented div64_u64 in terms of div64_u64_rem. But div64_u64_rem was removed because it slowed down div64_u64 (and there were no other users of div64_u64_rem). Device Mapper's I/O statistics support has a need for div64_u64_rem; reintroduce this helper as a separate method that doesn't slow down div64_u64, especially on 32-bit systems. BUG: 27175947 Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: Stanislaw Gruszka <sgruszka@redhat.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Change-Id: I05274c1a7235dfa972f5ddc4778e0154240fd9b6 Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com> | ||||
| * | first commit | Meizu OpenSource | 2016-08-15 | 1 | -0/+143 |
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