From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Gleixner Subject: [patch V2 25/29] livepatch: Simplify stack trace retrieval Date: Thu, 18 Apr 2019 10:41:44 +0200 Message-ID: <20190418084255.364915116@linutronix.de> References: <20190418084119.056416939@linutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: LKML Cc: Mike Snitzer , David Airlie , Catalin Marinas , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, dm-devel@redhat.com, Alexander Potapenko , Christoph Lameter , Christoph Hellwig , Alasdair Kergon , Marek Szyprowski , linux-arch@vger.kernel.org, x86@kernel.org, kasan-dev@googlegroups.com, Johannes Thumshirn , Andrey Ryabinin , Alexey Dobriyan , intel-gfx@lists.freedesktop.org, David Rientjes , Akinobu Mita , Steven Rostedt , Josef Bacik , Mike Rapoport , Andy Lutomirski , Josh Poimboeuf , David Sterba List-Id: intel-gfx@lists.freedesktop.org UmVwbGFjZSB0aGUgaW5kaXJlY3Rpb24gdGhyb3VnaCBzdHJ1Y3Qgc3RhY2tfdHJhY2UgYnkgdXNp bmcgdGhlIHN0b3JhZ2UKYXJyYXkgYmFzZWQgaW50ZXJmYWNlcy4KClNpZ25lZC1vZmYtYnk6IFRo b21hcyBHbGVpeG5lciA8dGdseEBsaW51dHJvbml4LmRlPgotLS0KIGtlcm5lbC9saXZlcGF0Y2gv dHJhbnNpdGlvbi5jIHwgICAyMiArKysrKysrKystLS0tLS0tLS0tLS0tCiAxIGZpbGUgY2hhbmdl ZCwgOSBpbnNlcnRpb25zKCspLCAxMyBkZWxldGlvbnMoLSkKCi0tLSBhL2tlcm5lbC9saXZlcGF0 Y2gvdHJhbnNpdGlvbi5jCisrKyBiL2tlcm5lbC9saXZlcGF0Y2gvdHJhbnNpdGlvbi5jCkBAIC0y MDIsMTUgKzIwMiwxNSBAQCB2b2lkIGtscF91cGRhdGVfcGF0Y2hfc3RhdGUoc3RydWN0IHRhc2tf CiAgKiBEZXRlcm1pbmUgd2hldGhlciB0aGUgZ2l2ZW4gc3RhY2sgdHJhY2UgaW5jbHVkZXMgYW55 IHJlZmVyZW5jZXMgdG8gYQogICogdG8tYmUtcGF0Y2hlZCBvciB0by1iZS11bnBhdGNoZWQgZnVu Y3Rpb24uCiAgKi8KLXN0YXRpYyBpbnQga2xwX2NoZWNrX3N0YWNrX2Z1bmMoc3RydWN0IGtscF9m dW5jICpmdW5jLAotCQkJCXN0cnVjdCBzdGFja190cmFjZSAqdHJhY2UpCitzdGF0aWMgaW50IGts cF9jaGVja19zdGFja19mdW5jKHN0cnVjdCBrbHBfZnVuYyAqZnVuYywgdW5zaWduZWQgbG9uZyAq ZW50cmllcywKKwkJCQl1bnNpZ25lZCBpbnQgbnJfZW50cmllcykKIHsKIAl1bnNpZ25lZCBsb25n IGZ1bmNfYWRkciwgZnVuY19zaXplLCBhZGRyZXNzOwogCXN0cnVjdCBrbHBfb3BzICpvcHM7CiAJ aW50IGk7CiAKLQlmb3IgKGkgPSAwOyBpIDwgdHJhY2UtPm5yX2VudHJpZXM7IGkrKykgewotCQlh ZGRyZXNzID0gdHJhY2UtPmVudHJpZXNbaV07CisJZm9yIChpID0gMDsgaSA8IG5yX2VudHJpZXM7 IGkrKykgeworCQlhZGRyZXNzID0gZW50cmllc1tpXTsKIAogCQlpZiAoa2xwX3RhcmdldF9zdGF0 ZSA9PSBLTFBfVU5QQVRDSEVEKSB7CiAJCQkgLyoKQEAgLTI1NCwyOSArMjU0LDI1IEBAIHN0YXRp YyBpbnQga2xwX2NoZWNrX3N0YWNrX2Z1bmMoc3RydWN0IGsKIHN0YXRpYyBpbnQga2xwX2NoZWNr X3N0YWNrKHN0cnVjdCB0YXNrX3N0cnVjdCAqdGFzaywgY2hhciAqZXJyX2J1ZikKIHsKIAlzdGF0 aWMgdW5zaWduZWQgbG9uZyBlbnRyaWVzW01BWF9TVEFDS19FTlRSSUVTXTsKLQlzdHJ1Y3Qgc3Rh Y2tfdHJhY2UgdHJhY2U7CiAJc3RydWN0IGtscF9vYmplY3QgKm9iajsKIAlzdHJ1Y3Qga2xwX2Z1 bmMgKmZ1bmM7Ci0JaW50IHJldDsKKwlpbnQgcmV0LCBucl9lbnRyaWVzOwogCi0JdHJhY2Uuc2tp cCA9IDA7Ci0JdHJhY2UubnJfZW50cmllcyA9IDA7Ci0JdHJhY2UubWF4X2VudHJpZXMgPSBNQVhf U1RBQ0tfRU5UUklFUzsKLQl0cmFjZS5lbnRyaWVzID0gZW50cmllczsKLQlyZXQgPSBzYXZlX3N0 YWNrX3RyYWNlX3Rza19yZWxpYWJsZSh0YXNrLCAmdHJhY2UpOworCXJldCA9IHN0YWNrX3RyYWNl X3NhdmVfdHNrX3JlbGlhYmxlKHRhc2ssIGVudHJpZXMsIEFSUkFZX1NJWkUoZW50cmllcykpOwog CVdBUk5fT05fT05DRShyZXQgPT0gLUVOT1NZUyk7Ci0JaWYgKHJldCkgeworCWlmIChyZXQgPCAw KSB7CiAJCXNucHJpbnRmKGVycl9idWYsIFNUQUNLX0VSUl9CVUZfU0laRSwKIAkJCSAiJXM6ICVz OiVkIGhhcyBhbiB1bnJlbGlhYmxlIHN0YWNrXG4iLAogCQkJIF9fZnVuY19fLCB0YXNrLT5jb21t LCB0YXNrLT5waWQpOwogCQlyZXR1cm4gcmV0OwogCX0KKwlucl9lbnRyaWVzID0gcmV0OwogCiAJ a2xwX2Zvcl9lYWNoX29iamVjdChrbHBfdHJhbnNpdGlvbl9wYXRjaCwgb2JqKSB7CiAJCWlmICgh b2JqLT5wYXRjaGVkKQogCQkJY29udGludWU7CiAJCWtscF9mb3JfZWFjaF9mdW5jKG9iaiwgZnVu YykgewotCQkJcmV0ID0ga2xwX2NoZWNrX3N0YWNrX2Z1bmMoZnVuYywgJnRyYWNlKTsKKwkJCXJl dCA9IGtscF9jaGVja19zdGFja19mdW5jKGZ1bmMsIGVudHJpZXMsIG5yX2VudHJpZXMpOwogCQkJ aWYgKHJldCkgewogCQkJCXNucHJpbnRmKGVycl9idWYsIFNUQUNLX0VSUl9CVUZfU0laRSwKIAkJ CQkJICIlczogJXM6JWQgaXMgc2xlZXBpbmcgb24gZnVuY3Rpb24gJXNcbiIsCgoKX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KSW50ZWwtZ2Z4IG1haWxpbmcg bGlzdApJbnRlbC1nZnhAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8vbGlzdHMuZnJlZWRl c2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vaW50ZWwtZ2Z4