From: Wei Wang <wei.w.wang@intel.com> To: qemu-devel@nongnu.org, virtio-dev@lists.oasis-open.org, mst@redhat.com, quintela@redhat.com, dgilbert@redhat.com Cc: peterx@redhat.com, pbonzini@redhat.com, liliang.opensource@gmail.com, nilal@redhat.com, riel@redhat.com, wei.w.wang@intel.com Subject: [Qemu-devel] [PATCH v9 1/8] bitmap: fix bitmap_count_one Date: Thu, 15 Nov 2018 18:07:57 +0800 [thread overview] Message-ID: <1542276484-25508-2-git-send-email-wei.w.wang@intel.com> (raw) In-Reply-To: <1542276484-25508-1-git-send-email-wei.w.wang@intel.com> BITMAP_LAST_WORD_MASK(nbits) returns 0xffffffff when "nbits=0", which makes bitmap_count_one fail to handle the "nbits=0" case. It appears to be preferred to remain BITMAP_LAST_WORD_MASK identical to the kernel implementation that it is ported from. So this patch fixes bitmap_count_one to handle the nbits=0 case. Inital Discussion Link: https://www.mail-archive.com/qemu-devel@nongnu.org/msg554316.html Signed-off-by: Wei Wang <wei.w.wang@intel.com> CC: Juan Quintela <quintela@redhat.com> CC: Dr. David Alan Gilbert <dgilbert@redhat.com> CC: Peter Xu <peterx@redhat.com> --- include/qemu/bitmap.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index 509eedd..679f1bd 100644 --- a/include/qemu/bitmap.h +++ b/include/qemu/bitmap.h @@ -221,6 +221,10 @@ static inline int bitmap_intersects(const unsigned long *src1, static inline long bitmap_count_one(const unsigned long *bitmap, long nbits) { + if (unlikely(!nbits)) { + return 0; + } + if (small_nbits(nbits)) { return ctpopl(*bitmap & BITMAP_LAST_WORD_MASK(nbits)); } else { -- 1.8.3.1
WARNING: multiple messages have this Message-ID (diff)
From: Wei Wang <wei.w.wang@intel.com> To: qemu-devel@nongnu.org, virtio-dev@lists.oasis-open.org, mst@redhat.com, quintela@redhat.com, dgilbert@redhat.com Cc: peterx@redhat.com, pbonzini@redhat.com, liliang.opensource@gmail.com, nilal@redhat.com, riel@redhat.com, wei.w.wang@intel.com Subject: [virtio-dev] [PATCH v9 1/8] bitmap: fix bitmap_count_one Date: Thu, 15 Nov 2018 18:07:57 +0800 [thread overview] Message-ID: <1542276484-25508-2-git-send-email-wei.w.wang@intel.com> (raw) In-Reply-To: <1542276484-25508-1-git-send-email-wei.w.wang@intel.com> BITMAP_LAST_WORD_MASK(nbits) returns 0xffffffff when "nbits=0", which makes bitmap_count_one fail to handle the "nbits=0" case. It appears to be preferred to remain BITMAP_LAST_WORD_MASK identical to the kernel implementation that it is ported from. So this patch fixes bitmap_count_one to handle the nbits=0 case. Inital Discussion Link: https://www.mail-archive.com/qemu-devel@nongnu.org/msg554316.html Signed-off-by: Wei Wang <wei.w.wang@intel.com> CC: Juan Quintela <quintela@redhat.com> CC: Dr. David Alan Gilbert <dgilbert@redhat.com> CC: Peter Xu <peterx@redhat.com> --- include/qemu/bitmap.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index 509eedd..679f1bd 100644 --- a/include/qemu/bitmap.h +++ b/include/qemu/bitmap.h @@ -221,6 +221,10 @@ static inline int bitmap_intersects(const unsigned long *src1, static inline long bitmap_count_one(const unsigned long *bitmap, long nbits) { + if (unlikely(!nbits)) { + return 0; + } + if (small_nbits(nbits)) { return ctpopl(*bitmap & BITMAP_LAST_WORD_MASK(nbits)); } else { -- 1.8.3.1 --------------------------------------------------------------------- To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org
next prev parent reply other threads:[~2018-11-15 10:41 UTC|newest] Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-11-15 10:07 [Qemu-devel] [PATCH v9 0/8] virtio-balloon: free page hint support Wei Wang 2018-11-15 10:07 ` [virtio-dev] " Wei Wang 2018-11-15 10:07 ` Wei Wang [this message] 2018-11-15 10:07 ` [virtio-dev] [PATCH v9 1/8] bitmap: fix bitmap_count_one Wei Wang 2018-11-15 10:07 ` [Qemu-devel] [PATCH v9 2/8] bitmap: bitmap_count_one_with_offset Wei Wang 2018-11-15 10:07 ` [virtio-dev] " Wei Wang 2018-11-15 10:07 ` [Qemu-devel] [PATCH v9 3/8] migration: use bitmap_mutex in migration_bitmap_clear_dirty Wei Wang 2018-11-15 10:07 ` [virtio-dev] " Wei Wang 2018-11-27 5:40 ` [Qemu-devel] " Peter Xu 2018-11-27 6:02 ` Wei Wang 2018-11-27 6:02 ` [virtio-dev] " Wei Wang 2018-11-27 6:12 ` [Qemu-devel] " Wei Wang 2018-11-27 6:12 ` Wei Wang 2018-11-27 7:41 ` [Qemu-devel] " Peter Xu 2018-11-27 10:17 ` Wei Wang 2018-11-27 10:17 ` Wei Wang 2018-11-15 10:08 ` [Qemu-devel] [PATCH v9 4/8] migration: API to clear bits of guest free pages from the dirty bitmap Wei Wang 2018-11-15 10:08 ` [virtio-dev] " Wei Wang 2018-11-27 6:06 ` [Qemu-devel] " Peter Xu 2018-11-27 6:52 ` Wei Wang 2018-11-27 6:52 ` [virtio-dev] " Wei Wang 2018-11-27 7:43 ` [Qemu-devel] " Peter Xu 2018-11-15 10:08 ` [Qemu-devel] [PATCH v9 5/8] migration/ram.c: add a notifier chain for precopy Wei Wang 2018-11-15 10:08 ` [virtio-dev] " Wei Wang 2018-11-27 7:38 ` [Qemu-devel] " Peter Xu 2018-11-27 10:25 ` Wei Wang 2018-11-27 10:25 ` [virtio-dev] " Wei Wang 2018-11-28 5:26 ` [Qemu-devel] " Peter Xu 2018-11-28 9:01 ` Wei Wang 2018-11-28 9:01 ` [virtio-dev] " Wei Wang 2018-11-28 9:32 ` [Qemu-devel] " Peter Xu 2018-11-29 3:40 ` Wei Wang 2018-11-29 3:40 ` [virtio-dev] " Wei Wang 2018-11-29 5:10 ` [Qemu-devel] " Peter Xu 2018-11-29 5:47 ` Peter Xu 2018-11-29 6:30 ` Wei Wang 2018-11-29 6:30 ` [virtio-dev] " Wei Wang 2018-11-30 5:05 ` [Qemu-devel] " Wei Wang 2018-11-30 5:05 ` [virtio-dev] " Wei Wang 2018-11-30 5:57 ` [Qemu-devel] " Peter Xu 2018-11-30 7:09 ` Wei Wang 2018-11-30 7:09 ` [virtio-dev] " Wei Wang 2018-11-15 10:08 ` [Qemu-devel] [PATCH v9 6/8] migration/ram.c: add a function to disable the bulk stage Wei Wang 2018-11-15 10:08 ` [virtio-dev] " Wei Wang 2018-11-15 10:08 ` [Qemu-devel] [PATCH v9 7/8] migration: move migrate_postcopy() to include/migration/misc.h Wei Wang 2018-11-15 10:08 ` [virtio-dev] " Wei Wang 2018-11-15 10:08 ` [Qemu-devel] [PATCH v9 8/8] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT Wei Wang 2018-11-15 10:08 ` [virtio-dev] " Wei Wang 2018-11-15 18:50 ` [Qemu-devel] [PATCH v9 0/8] virtio-balloon: free page hint support no-reply 2018-11-16 1:38 ` Wei Wang 2018-11-16 1:38 ` [virtio-dev] " Wei Wang 2018-11-27 3:11 ` Wei Wang 2018-11-27 3:11 ` [virtio-dev] " Wei Wang
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