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Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm 

Pull ARM fixes from Russell King:
 "Small set of fixes again."

* 'fixes' of git://git.linaro.org/people/rmk/linux-arm:
  ARM: 7419/1: vfp: fix VFP flushing regression on sigreturn path
  ARM: 7418/1: LPAE: fix access flag setup in mem_type_table
  ARM: prevent VM_GROWSDOWN mmaps extending below FIRST_USER_ADDRESS
  ARM: 7417/1: vfp: ensure preemption is disabled when enabling VFP access
This commit is contained in:
Linus Torvalds 2012-05-17 16:52:29 -07:00
parent 39c2028531 56cb248428
commit 42ea7d7f2a
3 changed files with 13 additions and 18 deletions
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4
arch/arm/mm/fault.c
View File

@ -247,7 +247,9 @@ __do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
return handle_mm_fault(mm, vma, addr & PAGE_MASK, flags);
check_stack:
if (vma->vm_flags & VM_GROWSDOWN && !expand_stack(vma, addr))
/* Don't allow expansion below FIRST_USER_ADDRESS */
if (vma->vm_flags & VM_GROWSDOWN &&
addr >= FIRST_USER_ADDRESS && !expand_stack(vma, addr))
goto good_area;
out:
return fault;

3
arch/arm/mm/mmu.c
View File

@ -489,7 +489,8 @@ static void __init build_mem_type_table(void)
*/
for (i = 0; i < ARRAY_SIZE(mem_types); i++) {
mem_types[i].prot_pte |= PTE_EXT_AF;
mem_types[i].prot_sect |= PMD_SECT_AF;
if (mem_types[i].prot_sect)
mem_types[i].prot_sect |= PMD_SECT_AF;
}
kern_pgprot |= PTE_EXT_AF;
vecs_pgprot |= PTE_EXT_AF;

24
arch/arm/vfp/vfpmodule.c
View File

@ -11,6 +11,7 @@
#include <linux/types.h>
#include <linux/cpu.h>
#include <linux/cpu_pm.h>
#include <linux/hardirq.h>
#include <linux/kernel.h>
#include <linux/notifier.h>
#include <linux/signal.h>
@ -432,7 +433,10 @@ void VFP_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs)
static void vfp_enable(void *unused)
{
u32 access = get_copro_access();
u32 access;
BUG_ON(preemptible());
access = get_copro_access();
/*
* Enable full access to VFP (cp10 and cp11)
@ -573,12 +577,6 @@ int vfp_preserve_user_clear_hwstate(struct user_vfp __user *ufp,
* entry.
*/
hwstate->fpscr &= ~(FPSCR_LENGTH_MASK | FPSCR_STRIDE_MASK);
/*
* Disable VFP in the hwstate so that we can detect if it gets
* used.
*/
hwstate->fpexc &= ~FPEXC_EN;
return 0;
}
@ -591,12 +589,8 @@ int vfp_restore_user_hwstate(struct user_vfp __user *ufp,
unsigned long fpexc;
int err = 0;
/*
* If VFP has been used, then disable it to avoid corrupting
* the new thread state.
*/
if (hwstate->fpexc & FPEXC_EN)
vfp_flush_hwstate(thread);
/* Disable VFP to avoid corrupting the new thread state. */
vfp_flush_hwstate(thread);
/*
* Copy the floating point registers. There can be unused
@ -657,7 +651,7 @@ static int __init vfp_init(void)
unsigned int cpu_arch = cpu_architecture();
if (cpu_arch >= CPU_ARCH_ARMv6)
vfp_enable(NULL);
on_each_cpu(vfp_enable, NULL, 1);
/*
* First check that there is a VFP that we can use.
@ -678,8 +672,6 @@ static int __init vfp_init(void)
} else {
hotcpu_notifier(vfp_hotplug, 0);
smp_call_function(vfp_enable, NULL, 1);
VFP_arch = (vfpsid & FPSID_ARCH_MASK) >> FPSID_ARCH_BIT; /* Extract the architecture version */
printk("implementor %02x architecture %d part %02x variant %x rev %x\n",
(vfpsid & FPSID_IMPLEMENTER_MASK) >> FPSID_IMPLEMENTER_BIT,