From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from [222.73.24.84] (helo=song.cn.fujitsu.com) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Uct7k-0002fj-Qc for kexec@lists.infradead.org; Thu, 16 May 2013 08:01:18 +0000 Message-ID: <519489EA.7000209@cn.fujitsu.com> Date: Thu, 16 May 2013 15:25:30 +0800 From: Zhang Yanfei MIME-Version: 1.0 Subject: Re: [PATCH v6 8/8] vmcore: support mmap() on /proc/vmcore References: <20130515090507.28109.28956.stgit@localhost6.localdomain6> <20130515090626.28109.95938.stgit@localhost6.localdomain6> In-Reply-To: <20130515090626.28109.95938.stgit@localhost6.localdomain6> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "kexec" Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: HATAYAMA Daisuke Cc: riel@redhat.com, hughd@google.com, jingbai.ma@hp.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, lisa.mitchell@hp.com, linux-mm@kvack.org, kumagai-atsushi@mxc.nes.nec.co.jp, ebiederm@xmission.com, kosaki.motohiro@jp.fujitsu.com, akpm@linux-foundation.org, walken@google.com, cpw@sgi.com, vgoyal@redhat.com 5LqOIDIwMTPlubQwNeaciDE15pelIDE3OjA2LCBIQVRBWUFNQSBEYWlzdWtlIOWGmemBkzoKPiBU aGlzIHBhdGNoIGludHJvZHVjZXMgbW1hcF92bWNvcmUoKS4KPiAKPiBEb24ndCBwZXJtaXQgd3Jp dGFibGUgbm9yIGV4ZWN1dGFibGUgbWFwcGluZyBldmVuIHdpdGggbXByb3RlY3QoKQo+IGJlY2F1 c2UgdGhpcyBtbWFwKCkgaXMgYWltZWQgYXQgcmVhZGluZyBjcmFzaCBkdW1wIG1lbW9yeS4KPiBO b24td3JpdGFibGUgbWFwcGluZyBpcyBhbHNvIHJlcXVpcmVtZW50IG9mIHJlbWFwX3Bmbl9yYW5n ZSgpIHdoZW4KPiBtYXBwaW5nIGxpbmVhciBwYWdlcyBvbiBub24tY29uc2VjdXRpdmUgcGh5c2lj YWwgcGFnZXM7IHNlZQo+IGlzX2Nvd19tYXBwaW5nKCkuCj4gCj4gU2V0IFZNX01JWEVETUFQIGZs YWcgdG8gcmVtYXAgbWVtb3J5IGJ5IHJlbWFwX3Bmbl9yYW5nZSBhbmQgYnkKPiByZW1hcF92bWFs bG9jX3JhbmdlX3BlcnRpYWwgYXQgdGhlIHNhbWUgdGltZSBmb3IgYSBzaW5nbGUKPiB2bWEuIGRv X211bm1hcCgpIGNhbiBjb3JyZWN0bHkgY2xlYW4gcGFydGlhbGx5IHJlbWFwcGVkIHZtYSB3aXRo IHR3bwo+IGZ1bmN0aW9ucyBpbiBhYm5vcm1hbCBjYXNlLiBTZWUgemFwX3B0ZV9yYW5nZSgpLCB2 bV9ub3JtYWxfcGFnZSgpIGFuZAo+IHRoZWlyIGNvbW1lbnRzIGZvciBkZXRhaWxzLgo+IAo+IE9u IHg4Ni0zMiBQQUUga2VybmVscywgbW1hcCgpIHN1cHBvcnRzIGF0IG1vc3QgMTZUQiBtZW1vcnkg b25seS4gVGhpcwo+IGxpbWl0YXRpb24gY29tZXMgZnJvbSB0aGUgZmFjdCB0aGF0IHRoZSB0aGly ZCBhcmd1bWVudCBvZgo+IHJlbWFwX3Bmbl9yYW5nZSgpLCBwZm4sIGlzIG9mIDMyLWJpdCBsZW5n dGggb24geDg2LTMyOiB1bnNpZ25lZCBsb25nLgo+IAo+IFNpZ25lZC1vZmYtYnk6IEhBVEFZQU1B IERhaXN1a2UgPGQuaGF0YXlhbWFAanAuZnVqaXRzdS5jb20+Cj4gLS0tCgpBc3N1bWluZyB0aGF0 IHBhdGNoIDQgJiA1IG9mIHRoaXMgc2VyaWVzIGFyZSBvazoKCkFja2VkLWJ5OiBaaGFuZyBZYW5m ZWkgPHpoYW5neWFuZmVpQGNuLmZ1aml0c3UuY29tPgoKPiAKPiAgZnMvcHJvYy92bWNvcmUuYyB8 ICAgODYgKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysr KysrCj4gIDEgZmlsZXMgY2hhbmdlZCwgODYgaW5zZXJ0aW9ucygrKSwgMCBkZWxldGlvbnMoLSkK PiAKPiBkaWZmIC0tZ2l0IGEvZnMvcHJvYy92bWNvcmUuYyBiL2ZzL3Byb2Mvdm1jb3JlLmMKPiBp bmRleCA3ZjIwNDFjLi4yYzcyNDg3IDEwMDY0NAo+IC0tLSBhL2ZzL3Byb2Mvdm1jb3JlLmMKPiAr KysgYi9mcy9wcm9jL3ZtY29yZS5jCj4gQEAgLTIwLDYgKzIwLDcgQEAKPiAgI2luY2x1ZGUgPGxp bnV4L2luaXQuaD4KPiAgI2luY2x1ZGUgPGxpbnV4L2NyYXNoX2R1bXAuaD4KPiAgI2luY2x1ZGUg PGxpbnV4L2xpc3QuaD4KPiArI2luY2x1ZGUgPGxpbnV4L3ZtYWxsb2MuaD4KPiAgI2luY2x1ZGUg PGFzbS91YWNjZXNzLmg+Cj4gICNpbmNsdWRlIDxhc20vaW8uaD4KPiAgI2luY2x1ZGUgImludGVy bmFsLmgiCj4gQEAgLTIwMCw5ICsyMDEsOTQgQEAgc3RhdGljIHNzaXplX3QgcmVhZF92bWNvcmUo c3RydWN0IGZpbGUgKmZpbGUsIGNoYXIgX191c2VyICpidWZmZXIsCj4gIAlyZXR1cm4gYWNjOwo+ ICB9Cj4gIAo+ICtzdGF0aWMgaW50IG1tYXBfdm1jb3JlKHN0cnVjdCBmaWxlICpmaWxlLCBzdHJ1 Y3Qgdm1fYXJlYV9zdHJ1Y3QgKnZtYSkKPiArewo+ICsJc2l6ZV90IHNpemUgPSB2bWEtPnZtX2Vu ZCAtIHZtYS0+dm1fc3RhcnQ7Cj4gKwl1NjQgc3RhcnQsIGVuZCwgbGVuLCB0c3o7Cj4gKwlzdHJ1 Y3Qgdm1jb3JlICptOwo+ICsKPiArCXN0YXJ0ID0gKHU2NCl2bWEtPnZtX3Bnb2ZmIDw8IFBBR0Vf U0hJRlQ7Cj4gKwllbmQgPSBzdGFydCArIHNpemU7Cj4gKwo+ICsJaWYgKHNpemUgPiB2bWNvcmVf c2l6ZSB8fCBlbmQgPiB2bWNvcmVfc2l6ZSkKPiArCQlyZXR1cm4gLUVJTlZBTDsKPiArCj4gKwlp ZiAodm1hLT52bV9mbGFncyAmIChWTV9XUklURSB8IFZNX0VYRUMpKQo+ICsJCXJldHVybiAtRVBF Uk07Cj4gKwo+ICsJdm1hLT52bV9mbGFncyAmPSB+KFZNX01BWVdSSVRFIHwgVk1fTUFZRVhFQyk7 Cj4gKwl2bWEtPnZtX2ZsYWdzIHw9IFZNX01JWEVETUFQOwo+ICsKPiArCWxlbiA9IDA7Cj4gKwo+ ICsJaWYgKHN0YXJ0IDwgZWxmY29yZWJ1Zl9zeikgewo+ICsJCXU2NCBwZm47Cj4gKwo+ICsJCXRz eiA9IGVsZmNvcmVidWZfc3ogLSBzdGFydDsKPiArCQlpZiAoc2l6ZSA8IHRzeikKPiArCQkJdHN6 ID0gc2l6ZTsKPiArCQlwZm4gPSBfX3BhKGVsZmNvcmVidWYgKyBzdGFydCkgPj4gUEFHRV9TSElG VDsKPiArCQlpZiAocmVtYXBfcGZuX3JhbmdlKHZtYSwgdm1hLT52bV9zdGFydCwgcGZuLCB0c3os Cj4gKwkJCQkgICAgdm1hLT52bV9wYWdlX3Byb3QpKQo+ICsJCQlyZXR1cm4gLUVBR0FJTjsKPiAr CQlzaXplIC09IHRzejsKPiArCQlzdGFydCArPSB0c3o7Cj4gKwkJbGVuICs9IHRzejsKPiArCj4g KwkJaWYgKHNpemUgPT0gMCkKPiArCQkJcmV0dXJuIDA7Cj4gKwl9Cj4gKwo+ICsJaWYgKHN0YXJ0 IDwgZWxmY29yZWJ1Zl9zeiArIGVsZm5vdGVzX3N6KSB7Cj4gKwkJdm9pZCAqa2FkZHI7Cj4gKwo+ ICsJCXRzeiA9IGVsZmNvcmVidWZfc3ogKyBlbGZub3Rlc19zeiAtIHN0YXJ0Owo+ICsJCWlmIChz aXplIDwgdHN6KQo+ICsJCQl0c3ogPSBzaXplOwo+ICsJCWthZGRyID0gZWxmbm90ZXNfYnVmICsg c3RhcnQgLSBlbGZjb3JlYnVmX3N6Owo+ICsJCWlmIChyZW1hcF92bWFsbG9jX3JhbmdlX3BhcnRp YWwodm1hLCB2bWEtPnZtX3N0YXJ0ICsgbGVuLAo+ICsJCQkJCQlrYWRkciwgdHN6KSkgewo+ICsJ CQlkb19tdW5tYXAodm1hLT52bV9tbSwgdm1hLT52bV9zdGFydCwgbGVuKTsKPiArCQkJcmV0dXJu IC1FQUdBSU47Cj4gKwkJfQo+ICsJCXNpemUgLT0gdHN6Owo+ICsJCXN0YXJ0ICs9IHRzejsKPiAr CQlsZW4gKz0gdHN6Owo+ICsKPiArCQlpZiAoc2l6ZSA9PSAwKQo+ICsJCQlyZXR1cm4gMDsKPiAr CX0KPiArCj4gKwlsaXN0X2Zvcl9lYWNoX2VudHJ5KG0sICZ2bWNvcmVfbGlzdCwgbGlzdCkgewo+ ICsJCWlmIChzdGFydCA8IG0tPm9mZnNldCArIG0tPnNpemUpIHsKPiArCQkJdTY0IHBhZGRyID0g MDsKPiArCj4gKwkJCXRzeiA9IG0tPm9mZnNldCArIG0tPnNpemUgLSBzdGFydDsKPiArCQkJaWYg KHNpemUgPCB0c3opCj4gKwkJCQl0c3ogPSBzaXplOwo+ICsJCQlwYWRkciA9IG0tPnBhZGRyICsg c3RhcnQgLSBtLT5vZmZzZXQ7Cj4gKwkJCWlmIChyZW1hcF9wZm5fcmFuZ2Uodm1hLCB2bWEtPnZt X3N0YXJ0ICsgbGVuLAo+ICsJCQkJCSAgICBwYWRkciA+PiBQQUdFX1NISUZULCB0c3osCj4gKwkJ CQkJICAgIHZtYS0+dm1fcGFnZV9wcm90KSkgewo+ICsJCQkJZG9fbXVubWFwKHZtYS0+dm1fbW0s IHZtYS0+dm1fc3RhcnQsIGxlbik7Cj4gKwkJCQlyZXR1cm4gLUVBR0FJTjsKPiArCQkJfQo+ICsJ CQlzaXplIC09IHRzejsKPiArCQkJc3RhcnQgKz0gdHN6Owo+ICsJCQlsZW4gKz0gdHN6Owo+ICsK PiArCQkJaWYgKHNpemUgPT0gMCkKPiArCQkJCXJldHVybiAwOwo+ICsJCX0KPiArCX0KPiArCj4g KwlyZXR1cm4gMDsKPiArfQo+ICsKPiAgc3RhdGljIGNvbnN0IHN0cnVjdCBmaWxlX29wZXJhdGlv bnMgcHJvY192bWNvcmVfb3BlcmF0aW9ucyA9IHsKPiAgCS5yZWFkCQk9IHJlYWRfdm1jb3JlLAo+ ICAJLmxsc2VlawkJPSBkZWZhdWx0X2xsc2VlaywKPiArCS5tbWFwCQk9IG1tYXBfdm1jb3JlLAo+ ICB9Owo+ICAKPiAgc3RhdGljIHN0cnVjdCB2bWNvcmUqIF9faW5pdCBnZXRfbmV3X2VsZW1lbnQo dm9pZCkKPiAKPiAKPiBfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fXwo+IGtleGVjIG1haWxpbmcgbGlzdAo+IGtleGVjQGxpc3RzLmluZnJhZGVhZC5vcmcKPiBo dHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2tleGVjCj4gCgoKX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18Ka2V4ZWMgbWFpbGlu ZyBsaXN0CmtleGVjQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5v cmcvbWFpbG1hbi9saXN0aW5mby9rZXhlYwo=