From abe1ee3a221d53778c3e58747bbec6e518e5471b Mon Sep 17 00:00:00 2001 From: Tim Abbott Date: Sun, 20 Sep 2009 18:14:15 -0400 Subject: Use macros for .data.page_aligned section. This patch changes the remaining direct references to .data.page_aligned in C and assembly code to use the macros in include/linux/linkage.h. Signed-off-by: Tim Abbott Cc: Thomas Gleixner Cc: Ingo Molnar Cc: H. Peter Anvin Cc: Haavard Skinnemoen Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Martin Schwidefsky Signed-off-by: Sam Ravnborg --- arch/powerpc/kernel/vdso.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/powerpc/kernel/vdso.c') diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c index a0abce251d0..3faaf29bdb2 100644 --- a/arch/powerpc/kernel/vdso.c +++ b/arch/powerpc/kernel/vdso.c @@ -1,3 +1,4 @@ + /* * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp. * @@ -74,7 +75,7 @@ static int vdso_ready; static union { struct vdso_data data; u8 page[PAGE_SIZE]; -} vdso_data_store __attribute__((__section__(".data.page_aligned"))); +} vdso_data_store __page_aligned_data; struct vdso_data *vdso_data = &vdso_data_store.data; /* Format of the patch table */ -- cgit v1.2.3-70-g09d2 From f2053f1a7bf6005b4e81826b1ac8d0b4117c4cf0 Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Mon, 21 Sep 2009 16:57:40 +0000 Subject: powerpc/perf_counter: Fix vdso detection perf_counter uses arch_vma_name() to detect a vdso region which in turn uses current->mm->context.vdso_base. We need to initialise this before doing the mmap or else we fail to detect the vdso. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/vdso.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'arch/powerpc/kernel/vdso.c') diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c index 3faaf29bdb2..94e2df3cae0 100644 --- a/arch/powerpc/kernel/vdso.c +++ b/arch/powerpc/kernel/vdso.c @@ -240,6 +240,13 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) goto fail_mmapsem; } + /* + * Put vDSO base into mm struct. We need to do this before calling + * install_special_mapping or the perf counter mmap tracking code + * will fail to recognise it as a vDSO (since arch_vma_name fails). + */ + current->mm->context.vdso_base = vdso_base; + /* * our vma flags don't have VM_WRITE so by default, the process isn't * allowed to write those pages. @@ -260,11 +267,10 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC| VM_ALWAYSDUMP, vdso_pagelist); - if (rc) + if (rc) { + current->mm->context.vdso_base = 0; goto fail_mmapsem; - - /* Put vDSO base into mm struct */ - current->mm->context.vdso_base = vdso_base; + } up_write(&mm->mmap_sem); return 0; -- cgit v1.2.3-70-g09d2