lkml.org 
[lkml]   [2016]   [Oct]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5/7] powerpc/vdso: split map_vdso from arch_setup_additional_pages
Date
I'll be easier to introduce vm_special_mapping struct in
a smaller map_vdso() function (see the next patches).

Impact: cleanup

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-mm@kvack.org
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
---
arch/powerpc/kernel/vdso.c | 67 +++++++++++++++++++++-------------------------
1 file changed, 31 insertions(+), 36 deletions(-)

diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 25d03d773c49..e68601ffc9ad 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -143,52 +143,23 @@ struct lib64_elfinfo
unsigned long text;
};

-
-/*
- * This is called from binfmt_elf, we create the special vma for the
- * vDSO and insert it into the mm struct tree
- */
-int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+static int map_vdso(struct page **vdso_pagelist, unsigned long vdso_pages,
+ unsigned long vdso_base)
{
struct mm_struct *mm = current->mm;
- struct page **vdso_pagelist;
- unsigned long vdso_pages;
- unsigned long vdso_base;
int ret = 0;

- if (!vdso_ready)
- return 0;
-
-#ifdef CONFIG_PPC64
- if (is_32bit_task()) {
- vdso_pagelist = vdso32_pagelist;
- vdso_pages = vdso32_pages;
- vdso_base = VDSO32_MBASE;
- } else {
- vdso_pagelist = vdso64_pagelist;
- vdso_pages = vdso64_pages;
- /*
- * On 64bit we don't have a preferred map address. This
- * allows get_unmapped_area to find an area near other mmaps
- * and most likely share a SLB entry.
- */
- vdso_base = 0;
- }
-#else
- vdso_pagelist = vdso32_pagelist;
- vdso_pages = vdso32_pages;
- vdso_base = VDSO32_MBASE;
-#endif
-
- current->mm->context.vdso_base = 0;
+ mm->context.vdso_base = 0;

- /* vDSO has a problem and was disabled, just don't "enable" it for the
+ /*
+ * vDSO has a problem and was disabled, just don't "enable" it for the
* process
*/
if (vdso_pages == 0)
return 0;
+
/* Add a page to the vdso size for the data page */
- vdso_pages ++;
+ vdso_pages++;

/*
* pick a base address for the vDSO in process space. We try to put it
@@ -239,6 +210,30 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
return ret;
}

+/*
+ * This is called from binfmt_elf, we create the special vma for the
+ * vDSO and insert it into the mm struct tree
+ */
+int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
+{
+ if (!vdso_ready)
+ return 0;
+
+ if (is_32bit_task())
+ return map_vdso(vdso32_pagelist, vdso32_pages, VDSO32_MBASE);
+#ifdef CONFIG_PPC64
+ else
+ /*
+ * On 64bit we don't have a preferred map address. This
+ * allows get_unmapped_area to find an area near other mmaps
+ * and most likely share a SLB entry.
+ */
+ return map_vdso(vdso64_pagelist, vdso64_pages, 0);
+#endif
+ WARN_ONCE(1, "task is not 32-bit on non PPC64 kernel");
+ return -1;
+}
+
const char *arch_vma_name(struct vm_area_struct *vma)
{
if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
--
2.10.0
\
 
 \ /
  Last update: 2016-10-26 01:27    [W:0.080 / U:0.764 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site