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Instead of checking PG_private, all code is changed to >> check page/folio->private !=3D NULL instead. > > I'm a little bit worried that page/folio->private is in a union, so today > it could (in theory) be !=3D NULL while PG_private isn't set. > > Is it really not possible to enter a path where PG_private is tested whil= e > page/folio->private !=3D NULL due to the union being used otherwise (PG_p= rivate > not set)? Yes, it is possible. See: #5 in the exceptional users: erofs uses ->private for reverse linked list and in-flight counters without setting PG_private. I get rid of the first one and converted the second one to use folio_attach/detach/get_private() to follow the general ->private use pattern.. For non file system folios, anon swapcache puts swap_entry_t in ->private and hugetlb puts its flags in ->private. 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Peter Anvin" , Chunhai Guo , Shuah Khan , ceph-devel@vger.kernel.org, Baoquan He , Matthew Brost , Jonathan Corbet , Stefano Stabellini , Yue Hu , Rakie Kim , Oleksandr Tyshchenko , Richard Weinberger , x86@kernel.org, Eric Biggers , Alexander Shishkin , Ingo Molnar , Viacheslav Dubeyko , Byungchul Park , Yu Kuai , xen-devel@lists.xenproject.org, Gao Xiang , Masami Hiramatsu , Wei Xu , Xiao Ni , Anna Schumaker , James Clark , Arnaldo Carvalho de Melo , linux-raid@vger.kernel.org, linux-fscrypt@vger.kernel.org, Borislav Petkov , Steven Rostedt , linux-mtd@lists.infradead.org, Axel Rasmussen , Jeffle Xu , Namhyung Kim , Jaegeuk Kim , Yuanchu Xie , Ilya Dryomov , Oscar Salvador , Joshua Hahn , Pratyush Yadav , linux-nfs@vger.kernel.org, "Theodore Y. Ts'o" , Song Liu , Li Nan , Minchan Kim , Pasha Tatashin , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-perf-users@vger.kernel.org, Sergey Senozhatsky , Thomas Gleixner , Jiri Olsa , linux-fsdevel@vger.kernel.org, Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org, linux-erofs@lists.ozlabs.org, Trond Myklebust Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net T24gTW9uIEF1ZyAzLCAyMDI2IGF0IDU6MDcgQU0gRURULCBKw7xyZ2VuIEdyb8OfIHdyb3RlOgo+ IE9uIDAxLjA4LjI2IDA0OjEzLCBaaSBZYW4gd3JvdGU6Cj4+IEhpIGFsbCwKPj4gCj4+IFRoaXMg cGF0Y2hzZXQgcmVtb3ZlcyBQR19wcml2YXRlIHRvIG1ha2Ugc3BhY2UgZm9yIHVwY29taW5nIFBH X2ZvbGlvCj4+IChyZXNlcnZlZCBhcyBfX1BHX2ZvbGlvKSBmb3IgaWRlbnRpZnlpbmcgcGFnZXMg ZnJvbSBhIGZvbGlvIChtb3JlIGRldGFpbHMKPj4gaW4gTm90ZSBiZWxvdykuIEluc3RlYWQgb2Yg Y2hlY2tpbmcgUEdfcHJpdmF0ZSwgYWxsIGNvZGUgaXMgY2hhbmdlZCB0bwo+PiBjaGVjayBwYWdl L2ZvbGlvLT5wcml2YXRlICE9IE5VTEwgaW5zdGVhZC4KPgo+IEknbSBhIGxpdHRsZSBiaXQgd29y cmllZCB0aGF0IHBhZ2UvZm9saW8tPnByaXZhdGUgaXMgaW4gYSB1bmlvbiwgc28gdG9kYXkKPiBp dCBjb3VsZCAoaW4gdGhlb3J5KSBiZSAhPSBOVUxMIHdoaWxlIFBHX3ByaXZhdGUgaXNuJ3Qgc2V0 Lgo+Cj4gSXMgaXQgcmVhbGx5IG5vdCBwb3NzaWJsZSB0byBlbnRlciBhIHBhdGggd2hlcmUgUEdf cHJpdmF0ZSBpcyB0ZXN0ZWQgd2hpbGUKPiBwYWdlL2ZvbGlvLT5wcml2YXRlICE9IE5VTEwgZHVl IHRvIHRoZSB1bmlvbiBiZWluZyB1c2VkIG90aGVyd2lzZSAoUEdfcHJpdmF0ZQo+IG5vdCBzZXQp PwoKWWVzLCBpdCBpcyBwb3NzaWJsZS4gU2VlOiAjNSBpbiB0aGUgZXhjZXB0aW9uYWwgdXNlcnM6 IGVyb2ZzIHVzZXMKLT5wcml2YXRlIGZvciByZXZlcnNlIGxpbmtlZCBsaXN0IGFuZCBpbi1mbGln aHQgY291bnRlcnMgd2l0aG91dCBzZXR0aW5nClBHX3ByaXZhdGUuIEkgZ2V0IHJpZCBvZiB0aGUg Zmlyc3Qgb25lIGFuZCBjb252ZXJ0ZWQgdGhlIHNlY29uZCBvbmUgdG8KdXNlIGZvbGlvX2F0dGFj aC9kZXRhY2gvZ2V0X3ByaXZhdGUoKSB0byBmb2xsb3cgdGhlIGdlbmVyYWwgLT5wcml2YXRlCnVz ZSBwYXR0ZXJuLi4KCkZvciBub24gZmlsZSBzeXN0ZW0gZm9saW9zLCBhbm9uIHN3YXBjYWNoZSBw dXRzIHN3YXBfZW50cnlfdCBpbgotPnByaXZhdGUgYW5kIGh1Z2V0bGIgcHV0cyBpdHMgZmxhZ3Mg aW4gLT5wcml2YXRlLiBJIGFkZGVkCmZvbGlvX3Rlc3RfZnNfcHJpdmF0ZSgpIHRvIGV4Y2x1ZGUg dGhlbSwgYnV0IHRoaXMgaGVscGVyIGlzIHBsYW5uZWQgdG8KYmUgdXNlZCBieSBjb3JlIE1NLCBz aW5jZSBmaWxlc3lzdGVtIGNvZGUgc2hvdWxkIG5vdCBlbmNvdW50ZXIgdGhlc2UKdHdvLgoKCi0t IApCZXN0IFJlZ2FyZHMsCllhbiwgWmkKCgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX18KTGludXgtZjJmcy1kZXZlbCBtYWlsaW5nIGxpc3QKTGludXgtZjJm cy1kZXZlbEBsaXN0cy5zb3VyY2Vmb3JnZS5uZXQKaHR0cHM6Ly9saXN0cy5zb3VyY2Vmb3JnZS5u ZXQvbGlzdHMvbGlzdGluZm8vbGludXgtZjJmcy1kZXZlbAo=