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Thu, 23 Oct 2025 10:38:07 -0700 (PDT) Message-ID: Subject: Re: [PATCH bpf-next 1/2] bpf: Skip bounds adjustment for conditional jumps on same register From: Eduard Zingerman To: KaFai Wan , Alexei Starovoitov Cc: Yonghong Song , Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Martin KaFai Lau , Song Liu , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , Paul Chaignon , Matan Shachnai , Luis Gerhorst , colin.i.king@gmail.com, Harishankar Vishwanathan , bpf , LKML , "open list:KERNEL SELFTEST FRAMEWORK" , Kaiyan Mei , Yinhao Hu Date: Thu, 23 Oct 2025 10:38:04 -0700 In-Reply-To: <0d267da41178f3ac4669621516888a06d6aa5665.camel@linux.dev> References: <20251022164457.1203756-1-kafai.wan@linux.dev> <20251022164457.1203756-2-kafai.wan@linux.dev> <39af9321-fb9b-4cee-84f1-77248a375e85@linux.dev> <1d03174dfe2a7eab1166596c85a6b586a660dffc.camel@gmail.com> <0d267da41178f3ac4669621516888a06d6aa5665.camel@linux.dev> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: base64 User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 T24gVGh1LCAyMDI1LTEwLTIzIGF0IDE5OjI2ICswODAwLCBLYUZhaSBXYW4gd3JvdGU6CgpbLi4u XQoKPiA+IEBAIC0xNjE3Myw2ICsxNjE3MywyNSBAQCBzdGF0aWMgaW50IGlzX3BrdF9wdHJfYnJh bmNoX3Rha2VuKHN0cnVjdAo+ID4gYnBmX3JlZ19zdGF0ZSAqZHN0X3JlZywKPiA+IMKgc3RhdGlj IGludCBpc19icmFuY2hfdGFrZW4oc3RydWN0IGJwZl9yZWdfc3RhdGUgKnJlZzEsIHN0cnVjdCBi cGZfcmVnX3N0YXRlCj4gPiAqcmVnMiwKPiA+IMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDC oMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgdTggb3Bjb2RlLCBib29sIGlzX2ptcDMyKQo+ID4gwqB7 Cj4gPiArwqDCoMKgwqDCoMKgIGlmIChyZWcxID09IHJlZzIpIHsKPiA+ICvCoMKgwqDCoMKgwqDC oMKgwqDCoMKgwqDCoMKgIHN3aXRjaCAob3Bjb2RlKSB7Cj4gPiArwqDCoMKgwqDCoMKgwqDCoMKg wqDCoMKgwqDCoCBjYXNlIEJQRl9KR0U6Cj4gPiArwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDC oCBjYXNlIEJQRl9KTEU6Cj4gPiArwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBjYXNlIEJQ Rl9KU0dFOgo+ID4gK8KgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgY2FzZSBCUEZfSlNMRToK PiA+ICvCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIGNhc2UgQlBGX0pFUToKPiA+ICvCoMKg wqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIGNhc2UgQlBGX0pTRVQ6Cj4gCj4gT3RoZXJzIGFyZSBm aW5lLCBidXQgQlBGX0pTRVQgb24gdGhlIHNhbWUgcmVnaXN0ZXIgY291bGQgYmUgMCAoaWYgdmFs dWUgaXMgMCkuCj4gQW5kIGl0J3MgdW5rbm93biB0byB0YWtlIHRoZSBicmFuY2ggaWYgMCB3aXRo aW4gdGhlIHJhbmdlLgoKUmlnaHQsIG1pc3NlZCB0aGF0IG9uZS4KCj4gCj4gPiArwqDCoMKgwqDC oMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgcmV0dXJuIDE7Cj4gPiArwqDCoMKg wqDCoMKgwqDCoMKgwqDCoMKgwqDCoCBjYXNlIEJQRl9KR1Q6Cj4gPiArwqDCoMKgwqDCoMKgwqDC oMKgwqDCoMKgwqDCoCBjYXNlIEJQRl9KTFQ6Cj4gPiArwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKg wqDCoCBjYXNlIEJQRl9KU0dUOgo+ID4gK8KgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgY2Fz ZSBCUEZfSlNMVDoKPiA+ICvCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIGNhc2UgQlBGX0pO RToKPiA+ICvCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoCByZXR1 cm4gMDsKPiA+ICvCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIGRlZmF1bHQ6Cj4gPiArwqDC oMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgcmV0dXJuIC0xOwo+ID4g K8KgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgwqAgfQo+ID4gK8KgwqDCoMKgwqDCoCB9Cj4gPiAK PiA+IEJ1dCB0aGF0J3MgdG9vIG11Y2ggY29kZSBmb3IgYW4gYXJ0aWZpY2lhbCBjYXNlLgo+ID4g SWRrLCBlaXRoZXIgd2F5IGlzIGZpbmUgd2l0aCBtZS4KPiAKPiBUaGVyZSBpcyBpc19zY2FsYXJf YnJhbmNoX3Rha2VuKCkgaW4gaXNfYnJhbmNoX3Rha2VuKCksIEkgbWlzc2VkIGl0LiBJJ2xsIGEp Cj4gY2hlY2sgdGhlIG9wY29kZSBvbmUgYnkgb25lIGluIGlzX3NjYWxhcl9icmFuY2hfdGFrZW4o KSwgYW5kIGIpIGtlZXAgdGhpcyBwYXRjaAo+IGZvciB1bmtub3duIEJQRl9KU0VUIGJyYW5jaC4K ClNvdW5kcyBnb29kIHRvIG1lLiBOb3RlIHRoYXQgdGhlIGxvZ2ljIGlzIGNvcnJlY3QgZm9yIGJv dGggc2NhbGFyIGFuZApub24tc2NhbGFyIGNhc2VzLCBzbyBJIGRvbid0IHRoaW5rIHdlIGhhdmUg dG8gY29uc3RyYWluIGl0IHRvCmlzX3NjYWxhcl9icmFuY2hfdGFrZW4oKSAoZG9uJ3QgdGhpbmsg dGhlcmUgaXMgYSBuZWVkIHRvIGNoZWNrIGlmCnBvaW50ZXIgY29tcGFyaXNvbnMgYXJlIGFsbG93 ZWQsIGFzIG5vIG5ldyBpbmZvcm1hdGlvbiBpcyBpbmZlcnJlZApmcm9tIGNvbXBhcmlzb25zIHdp dGggc2VsZikuCg==