linux-kernel - Re: [PATCH V12 0/14] Paravirtualized ticket spinlocks

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Date:	Fri, 09 Aug 2013 18:39:24 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	gleb@...hat.com, mingo@...hat.com, jeremy@...p.org, x86@...nel.org,
	konrad.wilk@...cle.com, pbonzini@...hat.com,
	linux-doc@...r.kernel.org, habanero@...ux.vnet.ibm.com,
	xen-devel@...ts.xensource.com, peterz@...radead.org,
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	srivatsa.vaddagiri@...il.com
Subject: Re: [PATCH  V12 0/14] Paravirtualized ticket spinlocks

On 08/09/2013 06:34 AM, H. Peter Anvin wrote:
> The kbuild test bot is reporting some pretty serious errors for this
> patchset.  I think these are serious enough that the patchset will need
> to be respun.
>

There were two problems:
(1) we were including spinlock_types.h in 
arch/x86/include/asm/paravirt_types.h.

This was resulting in redefinition of arch_spinlock_t for non SMP kernel

solution was :
conditional inclusion of spinlock_types.h like below

#ifdef CONFIG_SMP
#include <asm/spinlock_types.h>
#else
typedef u16 __ticket_t;
#endif

(we needed __ticket_t declaration for UP)

(2) we had forward declaration of atomic_read in jumpl_label.
It was causing problem for alpha, which has macro for atomic_read
instead of static inline.

Solution was to remove forward declaration and have atomic.h included.

Peter,
  the above two changes needs small changes in patch 1 and patch 9.
I 'll be resending only those two patches.

I am happy to resend the whole series if it is better and easier for
you.

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