From: Stephen Rothwell <sfr@canb.auug.org.au>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Christian Brauner <brauner@kernel.org>,
Tong Tiangen <tongtiangen@huawei.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Next Mailing List <linux-next@vger.kernel.org>
Subject: Re: linux-next: build warning after merge of the vfs-brauner tree
Date: Wed, 6 Mar 2024 15:37:03 +1100 [thread overview]
Message-ID: <20240306153703.499661d2@canb.auug.org.au> (raw)
In-Reply-To: <CAHk-=whdTCEDaUPTMHUQXPQHuM8dhBi8yWbNAL11yE_ODqR_uA@mail.gmail.com>
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Hi all,
On Tue, 5 Mar 2024 18:48:30 -0800 Linus Torvalds <torvalds@linux-foundation.org> wrote:
>
> On Tue, 5 Mar 2024 at 15:51, Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> >
> > fs/coredump.c: In function 'dump_user_range':
> > fs/coredump.c:923:40: warning: left-hand operand of comma expression has no effect [-Wunused-value]
> > 923 | #define dump_page_copy(src, dst) ((dst), (src))
> > | ^
> > fs/coredump.c:948:58: note: in expansion of macro 'dump_page_copy'
> > 948 | int stop = !dump_emit_page(cprm, dump_page_copy(page, dump_page));
> > | ^~~~~~~~~~~~~~
> >
> > Introduced by commit
> >
> > 4630f2caafcd ("coredump: get machine check errors early rather than during iov_iter")
>
> Bah. If comes from that
>
> #define dump_page_copy(src,dst) ((dst),(src))
>
> and I did it that way because I wanted to avoid *another* warning,
> namely the "dst not used" thing.
>
> But it would have probably been better to either make it an inline
> function, or maybe an explicit cast, eg
>
> #define dump_page_copy(src,dst) ((void)(dst),(src))
>
> or whatever.
This became a build failure for my i386 defconfig build, so I did this:
From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Wed, 6 Mar 2024 15:28:12 +1100
Subject: [PATCH] fix up for "coredump: get machine check errors early rather
than during iov_iter"
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
fs/coredump.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/coredump.c b/fs/coredump.c
index ea155ffee14c..5353b7ac67f2 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -920,7 +920,10 @@ static struct page *dump_page_copy(struct page *src, struct page *dst)
#define dump_page_alloc() ((struct page *)8) // Not NULL
#define dump_page_free(x) do { } while (0)
-#define dump_page_copy(src, dst) ((dst), (src))
+static struct page *dump_page_copy(struct page *src, struct page *dst)
+{
+ return NULL;
+}
#endif
--
2.43.0
--
Cheers,
Stephen Rothwell
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next prev parent reply other threads:[~2024-03-06 4:37 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-05 23:51 linux-next: build warning after merge of the vfs-brauner tree Stephen Rothwell
2024-03-06 2:48 ` Linus Torvalds
2024-03-06 4:37 ` Stephen Rothwell [this message]
2024-03-06 4:47 ` Linus Torvalds
2024-03-06 9:55 ` Christian Brauner
2024-03-06 4:58 ` Stephen Rothwell
-- strict thread matches above, loose matches on Subject: below --
2024-01-17 2:39 Stephen Rothwell
2023-12-21 7:48 Stephen Rothwell
2023-12-21 13:19 ` David Howells
2023-11-24 2:13 Stephen Rothwell
2023-11-24 7:58 ` Amir Goldstein
2023-09-25 4:31 Stephen Rothwell
2023-08-15 11:15 Stephen Rothwell
2023-08-07 5:38 Stephen Rothwell
2023-07-31 3:58 Stephen Rothwell
2023-07-04 3:51 Stephen Rothwell
2023-05-24 3:46 Stephen Rothwell
2023-05-24 9:06 ` Christian Brauner
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