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Barry Song
903edea6c5
Three points for this change: 1. We should consolidate all warnings in one place. Currently, the order > 1 warning is in the hotpath, while others are in less likely scenarios. Moving all warnings to the slowpath will reduce the overhead for order > 1 and increase the visibility of other warnings. 2. We currently have two warnings for order: one for order > 1 in the hotpath and another for order > costly_order in the laziest path. I suggest standardizing on order > 1 since it's been in use for a long time. 3. We don't need to check for __GFP_NOWARN in this case. __GFP_NOWARN is meant to suppress allocation failure reports, but here we're dealing with bug detection, not allocation failures. So replace WARN_ON_ONCE_GFP by WARN_ON_ONCE. [v-songbaohua@oppo.com: also update the doc for __GFP_NOFAIL with order > 1] Link: https://lkml.kernel.org/r/20240903223935.1697-1-21cnbao@gmail.com Link: https://lkml.kernel.org/r/20240830202823.21478-4-21cnbao@gmail.com Signed-off-by: Barry Song <v-songbaohua@oppo.com> Suggested-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: David Hildenbrand <david@redhat.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Christoph Lameter <cl@linux.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: David Rientjes <rientjes@google.com> Cc: "Eugenio Pérez" <eperezma@redhat.com> Cc: Hailong.Liu <hailong.liu@oppo.com> Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Kees Cook <kees@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Maxime Coquelin <maxime.coquelin@redhat.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Uladzislau Rezki (Sony) <urezki@gmail.com> Cc: Xie Yongji <xieyongji@bytedance.com> Cc: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Cc: Yafang Shao <laoar.shao@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.