From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?q?Michal=20Koutn=C3=BD?= Subject: [PATCH] cgroup: Prevent double killing of css when enabling threaded cgroup Date: Thu, 9 Jan 2020 16:05:59 +0100 Message-ID: <20200109150559.14457-1-mkoutny@suse.com> References: <20191219022716.o7vxxia6o67tyfmf@wittgenstein> Mime-Version: 1.0 Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <20191219022716.o7vxxia6o67tyfmf@wittgenstein> Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="macroman" To: cgroups@vger.kernel.org Cc: Tejun Heo , Li Zefan , Johannes Weiner , linux-kernel@vger.kernel.org, Christian Brauner VGhlIHRlc3RfY2djb3JlX25vX2ludGVybmFsX3Byb2Nlc3NfY29uc3RyYWludF9vbl90aHJlYWRz IHNlbGZ0ZXN0IHdoZW4KcnVubmluZyB3aXRoIHN1YnN5c3RlbSBjb250cm9sbGluZyBub2lzZSB0 cmlnZ2VycyB0d28gd2FybmluZ3M6Cgo+IFsgIDU5Ny40NDMxMTVdIFdBUk5JTkc6IENQVTogMSBQ SUQ6IDI4MTY3IGF0IGtlcm5lbC9jZ3JvdXAvY2dyb3VwLmM6MzEzMSBjZ3JvdXBfYXBwbHlfY29u dHJvbF9lbmFibGUrMHhlMC8weDNmMAo+IFsgIDU5Ny40NDM0MTNdIFdBUk5JTkc6IENQVTogMSBQ SUQ6IDI4MTY3IGF0IGtlcm5lbC9jZ3JvdXAvY2dyb3VwLmM6MzE3NyBjZ3JvdXBfYXBwbHlfY29u dHJvbF9kaXNhYmxlKzB4YTYvMHgxNjAKCkJvdGggc3RlbSBmcm9tIGEgY2FsbCB0byBjZ3JvdXBf dHlwZV93cml0ZS4gVGhlIGZpcnN0IHdhcm5pbmcgd2FzIGFsc28KdHJpZ2dlcmVkIGJ5IHN5emth bGxlci4KCldoZW4gd2UncmUgc3dpdGNoaW5nIGNncm91cCB0byB0aHJlYWRlZCBtb2RlIHNob3J0 bHkgYWZ0ZXIgYSBzdWJzeXN0ZW0Kd2FzIGRpc2FibGVkIG9uIGl0LCB3ZSBjYW4gc2VlIHRoZSBy ZXNwZWN0aXZlIHN1YnN5c3RlbSBjc3MgZHlpbmcgdGhlcmUuCgpUaGUgd2FybmluZyBpbiBjZ3Jv dXBfYXBwbHlfY29udHJvbF9lbmFibGUgaXMgaGFybWxlc3MgaW4gdGhpcyBjYXNlCnNpbmNlIHdl J3JlIG5vdCBhZGRpbmcgbmV3IHN1YnN5cyBhbnl3YXkuClRoZSB3YXJuaW5nIGluIGNncm91cF9h cHBseV9jb250cm9sX2Rpc2FibGUgaW5kaWNhdGVzIGFuIGF0dGVtcHQgdG8ga2lsbApjc3Mgb2Yg cmVjZW50bHkgZGlzYWJsZWQgc3Vic3lzdGVtIHJlcGVhdGVkbHkuCgpUaGUgY29tbWl0IHByZXZl bnRzIHRoZXNlIHNpdHVhdGlvbnMgYnkgbWFraW5nIGNncm91cF90eXBlX3dyaXRlIHdhaXQKZm9y IGFsbCBkeWluZyBjc3NlcyB0byBnbyBhd2F5IGJlZm9yZSByZS1hcHBseWluZyBzdWJ0cmVlIGNv bnRyb2xzLgpXaGVuIGF0IGl0LCB0aGUgbG9jYXRpb25zIG9mIFdBUk5fT05fT05DRSBjYWxscyBh cmUgbW92ZWQgc28gdGhhdAp3YXJuaW5nIGlzIHRyaWdnZXJlZCBvbmx5IHdoZW4gd2UgYXJlIGFi b3V0IHRvIG1pc3VzZSB0aGUgZHlpbmcgY3NzLgoKUmVwb3J0ZWQtYnk6IHN5emJvdCs1NDkzYjJh NTRkMzFkNmFlYTYyOUBzeXprYWxsZXIuYXBwc3BvdG1haWwuY29tClJlcG9ydGVkLWJ5OiBDaHJp c3RpYW4gQnJhdW5lciA8Y2hyaXN0aWFuLmJyYXVuZXJAdWJ1bnR1LmNvbT4KU2lnbmVkLW9mZi1i eTogTWljaGFsIEtvdXRuw70gPG1rb3V0bnlAc3VzZS5jb20+Ci0tLQoga2VybmVsL2Nncm91cC9j Z3JvdXAuYyB8IDExICsrKysrKy0tLS0tCiAxIGZpbGUgY2hhbmdlZCwgNiBpbnNlcnRpb25zKCsp LCA1IGRlbGV0aW9ucygtKQoKZGlmZiAtLWdpdCBhL2tlcm5lbC9jZ3JvdXAvY2dyb3VwLmMgYi9r ZXJuZWwvY2dyb3VwL2Nncm91cC5jCmluZGV4IDUzMDk4YzFkNDVlMi4uOTdjYzcxMzA3OWRmIDEw MDY0NAotLS0gYS9rZXJuZWwvY2dyb3VwL2Nncm91cC5jCisrKyBiL2tlcm5lbC9jZ3JvdXAvY2dy b3VwLmMKQEAgLTMwNTQsOCArMzA1NCw2IEBAIHN0YXRpYyBpbnQgY2dyb3VwX2FwcGx5X2NvbnRy b2xfZW5hYmxlKHN0cnVjdCBjZ3JvdXAgKmNncnApCiAJCWZvcl9lYWNoX3N1YnN5cyhzcywgc3Np ZCkgewogCQkJc3RydWN0IGNncm91cF9zdWJzeXNfc3RhdGUgKmNzcyA9IGNncm91cF9jc3MoZHNj dCwgc3MpOwogCi0JCQlXQVJOX09OX09OQ0UoY3NzICYmIHBlcmNwdV9yZWZfaXNfZHlpbmcoJmNz cy0+cmVmY250KSk7Ci0KIAkJCWlmICghKGNncm91cF9zc19tYXNrKGRzY3QpICYgKDEgPDwgc3Mt PmlkKSkpCiAJCQkJY29udGludWU7CiAKQEAgLTMwNjUsNiArMzA2Myw4IEBAIHN0YXRpYyBpbnQg Y2dyb3VwX2FwcGx5X2NvbnRyb2xfZW5hYmxlKHN0cnVjdCBjZ3JvdXAgKmNncnApCiAJCQkJCXJl dHVybiBQVFJfRVJSKGNzcyk7CiAJCQl9CiAKKwkJCVdBUk5fT05fT05DRShwZXJjcHVfcmVmX2lz X2R5aW5nKCZjc3MtPnJlZmNudCkpOworCiAJCQlpZiAoY3NzX3Zpc2libGUoY3NzKSkgewogCQkJ CXJldCA9IGNzc19wb3B1bGF0ZV9kaXIoY3NzKTsKIAkJCQlpZiAocmV0KQpAQCAtMzEwMCwxMSAr MzEwMCwxMSBAQCBzdGF0aWMgdm9pZCBjZ3JvdXBfYXBwbHlfY29udHJvbF9kaXNhYmxlKHN0cnVj dCBjZ3JvdXAgKmNncnApCiAJCWZvcl9lYWNoX3N1YnN5cyhzcywgc3NpZCkgewogCQkJc3RydWN0 IGNncm91cF9zdWJzeXNfc3RhdGUgKmNzcyA9IGNncm91cF9jc3MoZHNjdCwgc3MpOwogCi0JCQlX QVJOX09OX09OQ0UoY3NzICYmIHBlcmNwdV9yZWZfaXNfZHlpbmcoJmNzcy0+cmVmY250KSk7Ci0K IAkJCWlmICghY3NzKQogCQkJCWNvbnRpbnVlOwogCisJCQlXQVJOX09OX09OQ0UocGVyY3B1X3Jl Zl9pc19keWluZygmY3NzLT5yZWZjbnQpKTsKKwogCQkJaWYgKGNzcy0+cGFyZW50ICYmCiAJCQkg ICAgIShjZ3JvdXBfc3NfbWFzayhkc2N0KSAmICgxIDw8IHNzLT5pZCkpKSB7CiAJCQkJa2lsbF9j c3MoY3NzKTsKQEAgLTMzOTEsNyArMzM5MSw4IEBAIHN0YXRpYyBzc2l6ZV90IGNncm91cF90eXBl X3dyaXRlKHN0cnVjdCBrZXJuZnNfb3Blbl9maWxlICpvZiwgY2hhciAqYnVmLAogCWlmIChzdHJj bXAoc3Ryc3RyaXAoYnVmKSwgInRocmVhZGVkIikpCiAJCXJldHVybiAtRUlOVkFMOwogCi0JY2dy cCA9IGNncm91cF9rbl9sb2NrX2xpdmUob2YtPmtuLCBmYWxzZSk7CisJLyogZHJhaW4gZHlpbmcg Y3NzZXMgYmVmb3JlIHdlIHJlLWFwcGx5ICh0aHJlYWRlZCkgc3VidHJlZSBjb250cm9sICovCisJ Y2dycCA9IGNncm91cF9rbl9sb2NrX2xpdmUob2YtPmtuLCB0cnVlKTsKIAlpZiAoIWNncnApCiAJ CXJldHVybiAtRU5PRU5UOwogCi0tIAoyLjI0LjEKCg==