Hi Andrew, After merging the akpm tree, today's linux-next build (x86_64 allmodconfig) failed like this: In file included from include/linux/compat.h:18:0, from arch/x86/include/asm/ia32.h:7, from arch/x86/include/asm/sigframe.h:17, from arch/x86/kernel/asm-offsets.c:16: arch/x86/include/asm/compat.h: In function 'arch_compat_alloc_user_space': arch/x86/include/asm/compat.h:232:3: error: implicit declaration of function 'percpu_read' [-Werror=implicit-function-declaration] Caused by commit d1a797f388d6 ("x32: Handle process creation") from the tip tree interacting with commit 30999a95d190 ("percpu: remove percpu_xxx() functions") from the akpm tree. I applied the following fix up patch. From: Stephen Rothwell Date: Mon, 27 Feb 2012 17:12:00 +1100 Subject: [PATCH] percpu: fix for removal of percpu_xxx function Signed-off-by: Stephen Rothwell --- arch/x86/include/asm/compat.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h index e7f68b4..b6a2a1c 100644 --- a/arch/x86/include/asm/compat.h +++ b/arch/x86/include/asm/compat.h @@ -229,7 +229,7 @@ static inline void __user *arch_compat_alloc_user_space(long len) sp = task_pt_regs(current)->sp; } else { /* -128 for the x32 ABI redzone */ - sp = percpu_read(old_rsp) - 128; + sp = __this_cpu_read(old_rsp) - 128; } return (void __user *)round_down(sp - len, 16); -- 1.7.9.1 -- Cheers, Stephen Rothwell sfr@canb.auug.org.au