linux-kernel - Re: [PATCH] arch/um: falloc.h needs to be directly included for older libc

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Message-ID: <CAFd5g46AZC7EPgxfTRdws_4u6V=AxCGASG7jxCJXuXU=hJUxog@mail.gmail.com>
Date:   Tue, 17 Mar 2020 12:00:03 -0700
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Alan Maguire <alan.maguire@...cle.com>
Cc:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        alex.dewar@....co.uk, erelx.geron@...el.com,
        Johannes Berg <johannes.berg@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        linux-um <linux-um@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arch/um: falloc.h needs to be directly included for older libc

On Tue, Mar 17, 2020 at 10:38 AM Alan Maguire <alan.maguire@...cle.com> wrote:
>
> When building UML with glibc 2.17 installed, compilation
> of arch/um/os-Linux/file.c fails due to failure to find
> FALLOC_FL_PUNCH_HOLE and FALLOC_FL_KEEP_SIZE definitions.
>
> It appears that /usr/include/bits/fcntl-linux.h (indirectly
> included by /usr/include/fcntl.h) does not include falloc.h
> with an older glibc, whereas a more up-to-date version
> does.
>
> Adding the direct include to file.c resolves the issue
> and does not cause problems for more recent glibc.
>
> Fixes: 50109b5a03b4 ("um: Add support for DISCARD in the UBD Driver")
> Cc: Brendan Higgins <brendanhiggins@...gle.com>
> Signed-off-by: Alan Maguire <alan.maguire@...cle.com>

Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>