linux-kernel - Re: [PATCH v6 05/37] fs: Convert alloc_inode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <bliyhrwtskv5xhg3rxxszouxntrhnm3nxhcmrmdwwk4iyx5wdo@vodd22dbtn75>
Date: Thu, 21 Mar 2024 18:17:24 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Suren Baghdasaryan <surenb@...gle.com>, mhocko@...e.com, 
	vbabka@...e.cz, hannes@...xchg.org, roman.gushchin@...ux.dev, mgorman@...e.de, 
	dave@...olabs.net, willy@...radead.org, liam.howlett@...cle.com, 
	penguin-kernel@...ove.sakura.ne.jp, corbet@....net, void@...ifault.com, peterz@...radead.org, 
	juri.lelli@...hat.com, catalin.marinas@....com, will@...nel.org, arnd@...db.de, 
	tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com, x86@...nel.org, 
	peterx@...hat.com, david@...hat.com, axboe@...nel.dk, mcgrof@...nel.org, 
	masahiroy@...nel.org, nathan@...nel.org, dennis@...nel.org, jhubbard@...dia.com, 
	tj@...nel.org, muchun.song@...ux.dev, rppt@...nel.org, paulmck@...nel.org, 
	pasha.tatashin@...een.com, yosryahmed@...gle.com, yuzhao@...gle.com, dhowells@...hat.com, 
	hughd@...gle.com, andreyknvl@...il.com, keescook@...omium.org, 
	ndesaulniers@...gle.com, vvvvvv@...gle.com, gregkh@...uxfoundation.org, 
	ebiggers@...gle.com, ytcoode@...il.com, vincent.guittot@...aro.org, 
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, bristot@...hat.com, 
	vschneid@...hat.com, cl@...ux.com, penberg@...nel.org, iamjoonsoo.kim@....com, 
	42.hyeyoo@...il.com, glider@...gle.com, elver@...gle.com, dvyukov@...gle.com, 
	songmuchun@...edance.com, jbaron@...mai.com, aliceryhl@...gle.com, rientjes@...gle.com, 
	minchan@...gle.com, kaleshsingh@...gle.com, kernel-team@...roid.com, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, iommu@...ts.linux.dev, 
	linux-arch@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, 
	linux-modules@...r.kernel.org, kasan-dev@...glegroups.com, cgroups@...r.kernel.org, 
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v6 05/37] fs: Convert alloc_inode_sb() to a macro

On Thu, Mar 21, 2024 at 03:09:08PM -0700, Andrew Morton wrote:
> On Thu, 21 Mar 2024 17:15:39 -0400 Kent Overstreet <kent.overstreet@...ux.dev> wrote:
> 
> > On Thu, Mar 21, 2024 at 01:31:47PM -0700, Andrew Morton wrote:
> > > On Thu, 21 Mar 2024 09:36:27 -0700 Suren Baghdasaryan <surenb@...gle.com> wrote:
> > > 
> > > > From: Kent Overstreet <kent.overstreet@...ux.dev>
> > > > 
> > > > We're introducing alloc tagging, which tracks memory allocations by
> > > > callsite. Converting alloc_inode_sb() to a macro means allocations will
> > > > be tracked by its caller, which is a bit more useful.
> > > 
> > > I'd have thought that there would be many similar
> > > inlines-which-allocate-memory.  Such as, I dunno, jbd2_alloc_inode(). 
> > > Do we have to go converting things to macros as people report
> > > misleading or less useful results, or is there some more general
> > > solution to this?
> > 
> > No, this is just what we have to do.
> 
> Well, this is something we strike in other contexts - kallsyms gives us
> an inlined function and it's rarely what we wanted.
> 
> I think kallsyms has all the data which is needed to fix this - how
> hard can it be to figure out that a particular function address lies
> within an outer function?  I haven't looked...

This is different, though - even if a function is inlined in multiple
places there's only going to be one instance of a static var defined
within that function.