Hi Andrew, After merging the akpm-current tree, today's linux-next build (sparc defconfig) failed like this: In file included from arch/sparc/include/asm/pgtable_32.h:437:0, from arch/sparc/include/asm/pgtable.h:6, from include/linux/mm.h:53, from include/linux/ring_buffer.h:5, from include/linux/ftrace_event.h:5, from include/trace/syscall.h:6, from include/linux/syscalls.h:81, from init/initramfs.c:19: include/asm-generic/pgtable.h: In function 'pmdp_collapse_flush': include/asm-generic/pgtable.h:211:2: error: implicit declaration of function '__pmd' [-Werror=implicit-function-declaration] return __pmd(0); ^ include/asm-generic/pgtable.h:211:2: error: incompatible types when returning type 'int' but 'pmd_t' was expected Caused by commit b0593c13d7f6 ("mm/thp: split out pmd collapse/flush into separate functions"). sparc 32 has no __pmd(). I applied this temporary fix for today just to get it building: From: Stephen Rothwell Date: Thu, 14 May 2015 18:06:06 +1000 Subject: [PATCH] temporary fix for sparc 32 no having __pmd() Signed-off-by: Stephen Rothwell --- arch/sparc/include/asm/page_32.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/sparc/include/asm/page_32.h b/arch/sparc/include/asm/page_32.h index f82a1f36b655..b2881f326e8e 100644 --- a/arch/sparc/include/asm/page_32.h +++ b/arch/sparc/include/asm/page_32.h @@ -69,7 +69,7 @@ typedef struct { unsigned long iopgprot; } iopgprot_t; #define __pte(x) ((pte_t) { (x) } ) #define __iopte(x) ((iopte_t) { (x) } ) -/* #define __pmd(x) ((pmd_t) { (x) } ) */ /* XXX procedure with loop */ +#define __pmd(x) ((pmd_t) { { (x) } } ) /* XXX procedure with loop */ #define __pgd(x) ((pgd_t) { (x) } ) #define __ctxd(x) ((ctxd_t) { (x) } ) #define __pgprot(x) ((pgprot_t) { (x) } ) @@ -97,7 +97,7 @@ typedef unsigned long iopgprot_t; #define __pte(x) (x) #define __iopte(x) (x) -/* #define __pmd(x) (x) */ /* XXX later */ +#define __pmd(x) ((pmd_t) { { (x) } } ) /* XXX procedure with loop */ #define __pgd(x) (x) #define __ctxd(x) (x) #define __pgprot(x) (x) -- 2.1.4 -- Cheers, Stephen Rothwell sfr@canb.auug.org.au