From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Subject: Re: [PATCH v2 12/11] mm/hmm: Fix error flows in hmm_invalidate_range_start Date: Fri, 7 Jun 2019 22:35:30 -0300 Message-ID: <20190608013530.GB7844@ziepe.ca> References: <20190606184438.31646-1-jgg@ziepe.ca> <20190607160557.GA335@ziepe.ca> <439b5731-0b7e-b25b-ce1a-74b34e1f9bf5@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Disposition: inline In-Reply-To: <439b5731-0b7e-b25b-ce1a-74b34e1f9bf5@nvidia.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Ralph Campbell Cc: Andrea Arcangeli , linux-rdma@vger.kernel.org, John Hubbard , Felix.Kuehling@amd.com, dri-devel@lists.freedesktop.org, linux-mm@kvack.org, Jerome Glisse , amd-gfx@lists.freedesktop.org List-Id: amd-gfx.lists.freedesktop.org T24gRnJpLCBKdW4gMDcsIDIwMTkgYXQgMDQ6NTI6NThQTSAtMDcwMCwgUmFscGggQ2FtcGJlbGwg d3JvdGU6Cj4gPiBAQCAtMTQxLDYgKzE0MiwyMyBAQCBzdGF0aWMgdm9pZCBobW1fcmVsZWFzZShz dHJ1Y3QgbW11X25vdGlmaWVyICptbiwgc3RydWN0IG1tX3N0cnVjdCAqbW0pCj4gPiAgIAlobW1f cHV0KGhtbSk7Cj4gPiAgIH0KPiA+ICtzdGF0aWMgdm9pZCBub3RpZmllcnNfZGVjcmVtZW50KHN0 cnVjdCBobW0gKmhtbSkKPiA+ICt7Cj4gPiArCWxvY2tkZXBfYXNzZXJ0X2hlbGQoJmhtbS0+cmFu Z2VzX2xvY2spOwo+ID4gKwo+ID4gKwlobW0tPm5vdGlmaWVycy0tOwo+ID4gKwlpZiAoIWhtbS0+ bm90aWZpZXJzKSB7Cj4gPiArCQlzdHJ1Y3QgaG1tX3JhbmdlICpyYW5nZTsKPiA+ICsKPiA+ICsJ CWxpc3RfZm9yX2VhY2hfZW50cnkocmFuZ2UsICZobW0tPnJhbmdlcywgbGlzdCkgewo+ID4gKwkJ CWlmIChyYW5nZS0+dmFsaWQpCj4gPiArCQkJCWNvbnRpbnVlOwo+ID4gKwkJCXJhbmdlLT52YWxp ZCA9IHRydWU7Cj4gPiArCQl9Cj4gCj4gVGhpcyBqdXN0IGVmZmVjdGl2ZWx5IHNldHMgYWxsIHJh bmdlcyB0byB2YWxpZC4KPiBJJ20gbm90IHN1cmUgdGhhdCBpcyBiZXN0LgoKVGhpcyBpcyBhIHRy YWRlIG9mZiwgaXQgd291bGQgYmUgbXVjaCBtb3JlIGV4cGVuc2l2ZSB0byBoYXZlIGEgcHJlY2lz ZQondmFsaWQgPSB0cnVlJyAtIGluc3RlYWQgdGhpcyBhbGdvcml0aG0gaXMgcHJlY2lzZSBhYm91 dCAndmFsaWQgPQpmYWxzZScgYW5kIGxhenkgYWJvdXQgJ3ZhbGlkID0gdHJ1ZScgd2hpY2ggaXMg bXVjaCBsZXNzIGNvc3RseSB0bwpjYWxjdWxhdGUuCgo+IFNob3VsZG4ndCBobW1fcmFuZ2VfcmVn aXN0ZXIoKSBzdGFydCB3aXRoIHJhbmdlLnZhbGlkID0gdHJ1ZSBhbmQKPiB0aGVuIGhtbV9pbnZh bGlkYXRlX3JhbmdlX3N0YXJ0KCkgc2V0IGFmZmVjdGVkIHJhbmdlcyB0byBmYWxzZT8KCkl0IGtp bmQgb2YgZG9lcywgZXhwZWN0IHdoZW4gaXQgZG9lc24ndCwgcmlnaHQ/IDopCgo+IFRoZW4gdGhp cyBiZWNvbWVzIGp1c3Qgd2FrZV91cF9hbGwoKSBpZiAtLW5vdGlmaWVycyA9PSAwIGFuZAo+IGht bV9yYW5nZV93YWl0X3VudGlsX3ZhbGlkKCkgc2hvdWxkIHdhaXQgZm9yIG5vdGlmaWVycyA9PSAw LgoKQWxtb3N0Li4gYnV0IGl0IGlzIG1vcmUgdHJpY2t5IHRoYW4gdGhhdC4KClRoaXMgc2NoZW1l IGlzIGEgY29sbGlzaW9uLXJldHJ5IGFsZ29yaXRobS4gVGhlIHBhZ2VmYXVsdCBzaWRlIHJ1bnMg dG8KY29tcGxldGlvbiBpZiBubyBwYXJhbGxlbCBpbnZhbGlkYXRlIHN0YXJ0L2VuZCBoYXBwZW5z LgoKSWYgYSBwYXJhbGxlbCBpbnZhbGlkYXRpb24gaGFwcGVucyB0aGVuIHRoZSBwYWdlZmF1bHQg cmV0cmllcy4KClNlZWluZyBub3RpZmllcnMgPT0gMCBtZWFucyB0aGVyZSBpcyBhYnNvbHV0ZWx5 IG5vIGN1cnJlbnQgcGFyYWxsZWwKaW52YWxpZGF0aW9uLgoKU2VlaW5nIHJhbmdlLT52YWxpZCA9 PSB0cnVlICh1bmRlciB0aGUgZGV2aWNlIGxvY2spCm1lYW5zIHRoaXMgcmFuZ2UgZG9lc24ndCBp bnRlcnNlY3Qgd2l0aCBhIHBhcmFsbGVsIGludmFsaWRhdGUuCgpTby4uIGhtbV9yYW5nZV93YWl0 X3VudGlsX3ZhbGlkKCkgY2hlY2tzIHRoZSBwZXItcmFuZ2UgdmFsaWQgYmVjYXVzZQppdCBkb2Vz bid0IHdhbnQgdG8gc2xlZXAgaWYgKnRoaXMgcmFuZ2UqIGlzIG5vdCBpbnZvbHZlZCBpbiBhIHBh cmFsbGVsCmludmFsaWRhdGlvbiAtIGJ1dCBvbmNlIGl0IGJlY29tZXMgaW52b2x2ZWQsIHRoZW4g eWVzLCB2YWxpZCA9PSB0cnVlCmltcGxpZXMgbm90aWZpZXJzID09IDAuCgpJdCBpcyBlYXNpZXIv c2FmZXIgdG8gdXNlIHVubG9ja2VkIHZhcmlhYmxlIHJlYWRzIGlmIHRoZXJlIGlzIG9ubHkgb25l CnZhcmlhYmxlLCB0aHVzIHRoZSB3ZWlyZCBjb25zdHJ1Y3Rpb24uCgpJdCBpcyB1bmNsZWFyIHRv IG1lIGlmIHRoaXMgbWljcm8gb3B0aW1pemF0aW9uIGlzIHJlYWxseQp3b3J0aHdoaWxlLiBJdCBp cyB2ZXJ5IGV4cGVuc2l2ZSB0byBtYW5hZ2UgYWxsIHRoaXMgdHJhY2tpbmcsIGFuZCBubwpvdGhl ciBtbXUgbm90aWZpZXIgaW1wbGVtZW50YXRpb24gcmVhbGx5IGRvZXMgc29tZXRoaW5nIGxpa2UK dGhpcy4gRWxpbWluYXRpbmcgdGhlIHBlci1yYW5nZSB0cmFja2luZyBhbmQgdXNpbmcgdGhlIG5v dGlmaWVyIGNvdW50CmFzIGEgZ2xvYmFsIGxvY2sgd291bGQgYmUgbXVjaCBzaW1wbGVyLi4uCgo+ IE90aGVyd2lzZSwgcmFuZ2UudmFsaWQgZG9lc24ndCByZWFsbHkgbWVhbiBpdCdzIHZhbGlkLgoK UmlnaHQsIGl0IGRvZXNuJ3QgcmVhbGx5IG1lYW4gJ3ZhbGlkJwoKSXQgaXMgdHJhY2tpbmcgcG9z c2libGUgY29sbGlkaW5nIGludmFsaWRhdGVzIHN1Y2ggdGhhdCB2YWxpZCA9PSB0cnVlCih1bmRl ciB0aGUgZGV2aWNlIGxvY2spIG1lYW5zIHRoYXQgdGhlcmUgd2FzIG5vIGNvbGxpZGluZyBpbnZh bGlkYXRlLgoKSSBzdGlsbCB0aGluayB0aGlzIGltcGxlbWVudGF0aW9uIGRvZXNuJ3QgcXVpdGUg d29yaywgYXMgSSBkZXNjcmliZWQKaGVyZToKCmh0dHBzOi8vbG9yZS5rZXJuZWwub3JnL2xpbnV4 LW1tLzIwMTkwNTI3MTk1ODI5LkdCMTgwMTlAbWVsbGFub3guY29tLwoKQnV0IHRoZSBpZGVhIGlz IGJhc2ljYWxseSBzb3VuZCBhbmQgbWF0Y2hlcyB3aGF0IG90aGVyIG1tdSBub3RpZmllcgp1c2Vy cyBkbywganVzdCB1c2luZyBhIHNlcWNvdW50IGxpa2Ugc2NoZW1lLCBub3QgYSBib29sZWFuLgoK SmFzb24KX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KZHJp LWRldmVsIG1haWxpbmcgbGlzdApkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBz Oi8vbGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vZHJpLWRldmVs