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author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2024-04-29 17:47:51 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-05-02 17:32:50 +0300 |
commit | 15aa09d6d84629eb5296de30ac0aa19a33512f16 (patch) | |
tree | 2eeee3547f62f60710d7bac9dd7751be3c892ea6 /arch | |
parent | 57c34bf73128e25823354f41e9f845dc9aa1f3c6 (diff) | |
download | linux-15aa09d6d84629eb5296de30ac0aa19a33512f16.tar.xz |
bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS
commit 5af385f5f4cddf908f663974847a4083b2ff2c79 upstream.
bits_per() rounds up to the next power of two when passed a power of
two. This causes crashes on some machines and configurations.
Reported-by: Михаил Новоселов <m.novosyolov@rosalinux.ru>
Tested-by: Ильфат Гаптрахманов <i.gaptrakhmanov@rosalinux.ru>
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/3347
Link: https://lore.kernel.org/all/1c978cf1-2934-4e66-e4b3-e81b04cb3571@rosalinux.ru/
Fixes: f2d5dcb48f7b (bounds: support non-power-of-two CONFIG_NR_CPUS)
Cc: <stable@vger.kernel.org>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions