linux-kernel - Re: [BUILD FAILURE] nfs4state.c fails to compile with gcc 4.5.4

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Message-ID: <20171129230528.6955b58a@vmware.local.home>
Date:   Wed, 29 Nov 2017 23:05:28 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>
Subject: Re: [BUILD FAILURE] nfs4state.c fails to compile with gcc 4.5.4

On Wed, 29 Nov 2017 19:44:33 -0800
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

I keep older compilers around to test ftrace before -mfentry was
introduced.

I wonder if I should just add a config to force the use without
-mfentry even if the compiler supports it.

>  fs/nfs/nfs4state.c   | 3 +--
>  include/linux/nfs4.h | 2 +-
>  2 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
> index 54fd56d715a8..9db5d0d57fcb 100644
> --- a/fs/nfs/nfs4state.c
> +++ b/fs/nfs/nfs4state.c
> @@ -71,8 +71,7 @@ const nfs4_stateid zero_stateid = {
>  };
>  const nfs4_stateid invalid_stateid = {
>  	{
> -		.seqid = cpu_to_be32(0xffffffffU),
> -		.other = { 0 },
> +		{ .seqid = cpu_to_be32(0xffffffffU), .other = { 0 }, },

I tried this and it failed.

>  	},
>  	.type = NFS4_INVALID_STATEID_TYPE,
>  };
> diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
> index 47adac640191..e394ba0cd6c5 100644
> --- a/include/linux/nfs4.h
> +++ b/include/linux/nfs4.h
> @@ -53,11 +53,11 @@ typedef struct { char data[NFS4_VERIFIER_SIZE]; } nfs4_verifier;
>  
>  struct nfs4_stateid_struct {
>  	union {
> -		char data[NFS4_STATEID_SIZE];
>  		struct {
>  			__be32 seqid;
>  			char other[NFS4_STATEID_OTHER_SIZE];
>  		} __attribute__ ((packed));
> +		char data[NFS4_STATEID_SIZE];

But I didn't try this. This looks to be the key.

This works for me.

Tested-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve

>  	};
>  
>  	enum {