linux-kernel - Re: [PATCH v9 0/4] RISC-V: mm: Make SV48 the default address space

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Date:   Thu, 10 Aug 2023 00:07:13 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Charlie Jenkins <charlie@...osinc.com>
Cc:     Conor Dooley <conor.dooley@...rochip.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        paul.walmsley@...ive.com, palmer@...osinc.com,
        aou@...s.berkeley.edu, anup@...infault.org,
        konstantin@...uxfoundation.org, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
        mick@....forth.gr, jrtc27@...c27.com, rdunlap@...radead.org,
        alexghiti@...osinc.com
Subject: Re: [PATCH v9 0/4] RISC-V: mm: Make SV48 the default address space

On Wed, Aug 09, 2023 at 03:45:31PM -0700, Charlie Jenkins wrote:
> On Wed, Aug 09, 2023 at 08:42:58AM +0100, Conor Dooley wrote:
> > On Tue, Aug 08, 2023 at 06:51:06PM -0700, Charlie Jenkins wrote:
> > > Make sv48 the default address space for mmap as some applications
> > > currently depend on this assumption. Users can now select a
> > > desired address space using a non-zero hint address to mmap. Previously,
> > > requesting the default address space from mmap by passing zero as the hint
> > > address would result in using the largest address space possible. Some
> > > applications depend on empty bits in the virtual address space, like Go and
> > > Java, so this patch provides more flexibility for application developers.
> > 
> > This still does not build:
> > ../fs/binfmt_flat.c:900:30: error: call to undeclared function 'is_compat_task'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
> > 
> > Reproduceable with allmodconfig.
> > 
> There is some weird interaction with compat.h. Moving the definitions
> in pgtable.h into the #ifndef __ASSEMBLY__ guarded section resolves 
> the compile error. I will send out another version with this change.

Just be sure to run an allmodconfig build this time before doing so ;)

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