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Re: Error in accel/tcg?

From: Peter Maydell
Subject: Re: Error in accel/tcg?
Date: Tue, 20 Jul 2021 16:06:06 +0100

On Tue, 20 Jul 2021 at 10:06, Peter Maydell <peter.maydell@linaro.org> wrote:
> On Mon, 19 Jul 2021 at 23:20, Kenneth Adam Miller
> <kennethadammiller@gmail.com> wrote:
> >
> > Hello,
> >
> > I get the following error:
> >
> > <long cmd here> -c ../accel/tcg/cputlb.c
> > ../qemu/accel/tcg/cputlb.c: In function 'tlb_flush_page_by_mmuidx':
> > ../qemu/accel/tcg/cputlb.c:602:23: error: comparison is always true due to 
> > limited range of data type [-Werror=type-limits]
> >     } else if (idxmap < TARGET_PAGE_SIZE) {
> >
> > I don't know why that suddenly shows up.
> So, which target are you building for, which host, and which
> compiler version? (TARGET_PAGE_SIZE gets a value that depends
> on the TARGET_PAGE_BITS setting for the target.)

You'll get this warning, incidentally, if you have a
target which sets TARGET_PAGE_BITS to 16 or more.
Currently the only target which does that is hexagon, and
that is linux-user only, so it doesn't run into this (yet).

The warning is harmless (apart from preventing compilation with
-Werror), but there's no in-theory reason why softmmu shouldn't
work with 64K pages, so we should figure out a way to rephrase
the cputlb.c code to suppress it.

-- PMM

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