Date: Wed, 24 Jan 2018 10:48:43 -0800 From: Conrad Meyer <cem@freebsd.org> To: Hans Petter Selasky <hps@selasky.org> Cc: src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r328218 - in head/sys: amd64/amd64 arm/xscale/ixp425 arm64/arm64 cam cam/ctl compat/ndis dev/aacraid dev/advansys dev/ath dev/beri/virtio dev/bnxt dev/bwn dev/ciss dev/cxgbe/crypto dev/... Message-ID: <CAG6CVpWpZy06RrNo2hmDDeo1o3ZoQUAXsNBFBXLnB4VDdW0otg@mail.gmail.com> In-Reply-To: <2aa48cbd-247a-66cd-b486-02ee77ec2e96@selasky.org> References: <201801211542.w0LFgbsp005980@repo.freebsd.org> <CAG6CVpXxuFyHS11rF=NF6bSSkC2=xnDh=WnbK-aWp4sOomrZ7w@mail.gmail.com> <51ff8aef-5660-7857-e4d5-12cdc77bc071@FreeBSD.org> <20180124182548.X1063@besplex.bde.org> <CANCZdfpL7t_J6xXi8w%2BwtxE%2B4x8EA0AzqzQKno=dUKaJ_NXFrw@mail.gmail.com> <CAG6CVpWv32FjZggRCM3JNWCsMDOSXbVzQfP-dh73fei6Hqr5Mw@mail.gmail.com> <1516817048.42536.182.camel@freebsd.org> <CAG6CVpUpVLe5f=As44TOyePDTy-7LaTKA=rCkk-NjZvZkA5nQg@mail.gmail.com> <CANCZdfqZ5ZiMceh7NZ-YpbgsTW6gqwcxVun0XM_bY2%2BFpustKQ@mail.gmail.com> <2aa48cbd-247a-66cd-b486-02ee77ec2e96@selasky.org>
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On Wed, Jan 24, 2018 at 10:40 AM, Hans Petter Selasky <hps@selasky.org> wrote: > On 01/24/18 19:28, Warner Losh wrote: >> >> Does mallocarray(10 ,1Gb) panic on i386? It does not. It should. > > > Hi, > > If M_WAITOK is specified, then sleep forever and print a message. > Else return NULL ? Depends on the machine. From malloc.9: > If the multiplication of nmemb and size would cause an integer overflow, the mallocarray() function induces a panic. 64-bit arch does not experience overflow and will sleep until 10GB is available. (This is why the caller should do a narrower check.) 32-bit panics, since 10 * 1GB overflows 32-bit size_t (== u_long). Best, Conrad
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