linux-kernel - Re: compile error on linus git with ppc64

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Message-ID: <alpine.DEB.2.02.1401281953040.32278@chino.kir.corp.google.com>
Date:	Tue, 28 Jan 2014 19:59:31 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org
Subject: Re: compile error on linus git with ppc64

On Tue, 28 Jan 2014, Jesse Brandeburg wrote:

> fresh pull, commit d891ea23d5203e5c47439b2a174f86a00b356a6c - merge
> ceph-client.
> 
> I get a compile error:
> jbrandeb@...andeb-pseries:~/git/linux> make -j12
> scripts/kconfig/conf --silentoldconfig Kconfig
>   CHK     include/config/kernel.release
>   WRAP    arch/powerpc/include/generated/asm/clkdev.h
>   WRAP    arch/powerpc/include/generated/asm/rwsem.h
>   WRAP    arch/powerpc/include/generated/asm/trace_clock.h
>   WRAP    arch/powerpc/include/generated/asm/preempt.h
>   WRAP    arch/powerpc/include/generated/asm/hash.h
>   WRAP    arch/powerpc/include/generated/asm/vtime.h
>   CHK     include/generated/uapi/linux/version.h
>   UPD     include/generated/uapi/linux/version.h
>   HOSTCC  scripts/dtc/checks.o
>   HOSTCC  scripts/dtc/data.o
>   SHIPPED scripts/dtc/dtc-lexer.lex.c
>   SHIPPED scripts/dtc/dtc-parser.tab.h
>   HOSTCC  scripts/kallsyms
>   HOSTCC  scripts/genksyms/genksyms.o
>   CC      scripts/mod/empty.o
>   HOSTCC  scripts/mod/mk_elfconfig
>   CC      scripts/mod/devicetable-offsets.s
>   SHIPPED scripts/dtc/dtc-parser.tab.c
>   HOSTCC  scripts/dtc/dtc.o
>   SHIPPED scripts/genksyms/lex.lex.c
>   SHIPPED scripts/genksyms/keywords.hash.c
>   HOSTCC  scripts/pnmtologo
>   SHIPPED scripts/genksyms/parse.tab.h
>   SHIPPED scripts/genksyms/parse.tab.c
>   HOSTCC  scripts/dtc/flattree.o
>   HOSTCC  scripts/dtc/fstree.o
>   HOSTCC  scripts/genksyms/lex.lex.o
>   HOSTCC  scripts/genksyms/parse.tab.o
>   HOSTCC  scripts/dtc/livetree.o
>   HOSTCC  scripts/dtc/srcpos.o
>   HOSTCC  scripts/dtc/treesource.o
>   HOSTCC  scripts/conmakehash
>   HOSTCC  scripts/bin2c
>   MKELF   scripts/mod/elfconfig.h
>   HOSTCC  scripts/dtc/util.o
>   HOSTCC  scripts/mod/modpost.o
>   HOSTCC  scripts/mod/sumversion.o
>   HOSTCC  scripts/dtc/dtc-lexer.lex.o
>   HOSTLD  scripts/genksyms/genksyms
>   HOSTCC  scripts/dtc/dtc-parser.tab.o
>   GEN     scripts/mod/devicetable-offsets.h
>   HOSTCC  scripts/mod/file2alias.o
>   HOSTLD  scripts/dtc/dtc
>   HOSTLD  scripts/mod/modpost
>   UPD     include/config/kernel.release
>   CHK     include/generated/utsrelease.h
>   UPD     include/generated/utsrelease.h
>   CC      kernel/bounds.s
>   GEN     include/generated/bounds.h
>   CC      arch/powerpc/kernel/asm-offsets.s
> In file included from include/linux/spinlock.h:81,
>                  from include/linux/seqlock.h:35,
>                  from include/linux/time.h:5,
>                  from include/uapi/linux/timex.h:56,
>                  from include/linux/timex.h:56,
>                  from include/linux/sched.h:17,
>                  from arch/powerpc/kernel/asm-offsets.c:17:
> include/linux/spinlock_types.h:76: error: redefinition of typedef
> ‘spinlock_t’ /home/jbrandeb/git/linux/arch/powerpc/include/asm/pgtable-ppc64.h:563:
> error: previous declaration of ‘spinlock_t’ was here

Confirmed, I saw this with ppc64_defconfig.  It's due to b3084f4db3ae 
("powerpc/thp: Fix crash on mremap").


powerpc, spinlock: fix build error

Build fails with

include/linux/spinlock_types.h:76: error: redefinition of typedef ‘spinlock_t’ 
arch/powerpc/include/asm/pgtable-ppc64.h:563: error: previous declaration of ‘spinlock_t’ was here

due to commit b3084f4db3ae ("powerpc/thp: Fix crash on mremap").  Remove 
the bogus typedef and include spinlock_types.h.

Reported-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 arch/powerpc/include/asm/pgtable-ppc64.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/pgtable-ppc64.h b/arch/powerpc/include/asm/pgtable-ppc64.h
--- a/arch/powerpc/include/asm/pgtable-ppc64.h
+++ b/arch/powerpc/include/asm/pgtable-ppc64.h
@@ -365,6 +365,8 @@ void pgtable_cache_init(void);
 			 _PAGE_THP_HUGE)
 
 #ifndef __ASSEMBLY__
+#include <linux/spinlock_types.h>
+
 /*
  * The linux hugepage PMD now include the pmd entries followed by the address
  * to the stashed pgtable_t. The stashed pgtable_t contains the hpte bits.
@@ -560,7 +562,6 @@ extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
 			    pmd_t *pmdp);
 
 #define pmd_move_must_withdraw pmd_move_must_withdraw
-typedef struct spinlock spinlock_t;
 static inline int pmd_move_must_withdraw(spinlock_t *new_pmd_ptl,
 					 spinlock_t *old_pmd_ptl)
 {