linux-kernel - Re: linux-next: manual merge of the tip tree with the vfs tree

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Date:   Wed, 5 Aug 2020 11:03:06 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Al Viro <viro@...IV.linux.org.uk>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: linux-next: manual merge of the tip tree with the vfs tree

Hi all,

On Mon, 27 Jul 2020 15:35:10 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> 
> Today's linux-next merge of the tip tree got a conflict in:
> 
>   arch/x86/include/asm/fpu/xstate.h
> 
> between commit:
> 
>   c196049cc732 ("x86: switch to ->regset_get()")
> 
> from the vfs tree and commit:
> 
>   ce711ea3cab9 ("perf/x86/intel/lbr: Support XSAVES/XRSTORS for LBR context switch")
> 
> from the tip tree.
> 
> I fixed it up (see below) and can carry the fix as necessary. This
> is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging.  You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
> 
> diff --cc arch/x86/include/asm/fpu/xstate.h
> index f691ea1bc086,1559554af931..000000000000
> --- a/arch/x86/include/asm/fpu/xstate.h
> +++ b/arch/x86/include/asm/fpu/xstate.h
> @@@ -71,8 -103,9 +103,9 @@@ extern void __init update_regset_xstate
>   void *get_xsave_addr(struct xregs_state *xsave, int xfeature_nr);
>   const void *get_xsave_field_ptr(int xfeature_nr);
>   int using_compacted_format(void);
> + int xfeature_size(int xfeature_nr);
>  -int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
>  -int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
>  +struct membuf;
>  +void copy_xstate_to_kernel(struct membuf to, struct xregs_state *xsave);
>   int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf);
>   int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf);
>   void copy_supervisor_to_kernel(struct xregs_state *xsave);

This is now a conflict between the vfs tree and Linus' tree.

-- 
Cheers,
Stephen Rothwell

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