linux-kernel - linux-next: manual merge of the arm tree with Linus' tree

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Date:	Mon, 26 Mar 2012 11:05:50 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Russell King <rmk@....linux.org.uk>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Will Deacon <will.deacon@....com>,
	Jason Baron <jbaron@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: linux-next: manual merge of the arm tree with Linus' tree

Hi Russell,

Today's linux-next merge of the arm tree got a conflict in
arch/arm/kernel/process.c between commit 909af768e888 ("coredump: remove
VM_ALWAYSDUMP flag") from the  tree and commit e19d478e808e ("ARM:
7294/1: vectors: use gate_vma for vectors user mapping") from the arm
tree.

I fixed it up (see below) and can carry the fix as necessary.
-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

diff --cc arch/arm/kernel/process.c
index d3eca45,1531480..0000000
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@@ -529,17 -531,36 +529,35 @@@ unsigned long arch_randomize_brk(struc
  #ifdef CONFIG_MMU
  /*
   * The vectors page is always readable from user space for the
-  * atomic helpers and the signal restart code.  Let's declare a mapping
-  * for it so it is visible through ptrace and /proc/<pid>/mem.
+  * atomic helpers and the signal restart code. Insert it into the
+  * gate_vma so that it is visible through ptrace and /proc/<pid>/mem.
   */
+ static struct vm_area_struct gate_vma;
  
- int vectors_user_mapping(void)
+ static int __init gate_vma_init(void)
  {
- 	struct mm_struct *mm = current->mm;
- 	return install_special_mapping(mm, 0xffff0000, PAGE_SIZE,
- 				       VM_READ | VM_EXEC |
- 				       VM_MAYREAD | VM_MAYEXEC | VM_RESERVED,
- 				       NULL);
+ 	gate_vma.vm_start	= 0xffff0000;
+ 	gate_vma.vm_end		= 0xffff0000 + PAGE_SIZE;
+ 	gate_vma.vm_page_prot	= PAGE_READONLY_EXEC;
+ 	gate_vma.vm_flags	= VM_READ | VM_EXEC |
 -				  VM_MAYREAD | VM_MAYEXEC |
 -				  VM_ALWAYSDUMP;
++				  VM_MAYREAD | VM_MAYEXEC;
+ 	return 0;
+ }
+ arch_initcall(gate_vma_init);
+ 
+ struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
+ {
+ 	return &gate_vma;
+ }
+ 
+ int in_gate_area(struct mm_struct *mm, unsigned long addr)
+ {
+ 	return (addr >= gate_vma.vm_start) && (addr < gate_vma.vm_end);
+ }
+ 
+ int in_gate_area_no_mm(unsigned long addr)
+ {
+ 	return in_gate_area(NULL, addr);
  }
  
  const char *arch_vma_name(struct vm_area_struct *vma)

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