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Three fixes for ARM this time around: 

- A fix for update_sections_early() to cope with NULL ->mm pointers.
 - A correction to the backtrace code to allow proper backtraces.
 - Reinforcement of pfn_valid() with PFNs >= 4GiB.
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Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm

Pull ARM fixes from Russell King:
 "Three fixes for ARM this time around:

   - A fix for update_sections_early() to cope with NULL ->mm pointers.

   - A correction to the backtrace code to allow proper backtraces.

   - Reinforcement of pfn_valid() with PFNs >= 4GiB"

* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 8901/1: add a criteria for pfn_valid of arm
  ARM: 8897/1: check stmfd instruction using right shift
  ARM: 8874/1: mm: only adjust sections of valid mm structures
This commit is contained in:
Linus Torvalds 2019-08-30 11:58:02 -07:00
parent 846d2db3e0 5b3efa4f14
commit 0a51b08fb3
2 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/lib/backtrace.S
View File

@ -66,7 +66,7 @@ for_each_frame: tst frame, mask @ Check for address exceptions
1003: ldr r2, [sv_pc, #-4] @ if stmfd sp!, {args} exists,
ldr r3, .Ldsi+4 @ adjust saved 'pc' back one
teq r3, r2, lsr #10 @ instruction
teq r3, r2, lsr #11 @ instruction
subne r0, sv_pc, #4 @ allow for mov
subeq r0, sv_pc, #8 @ allow for mov + stmia

8
arch/arm/mm/init.c
View File

@ -175,6 +175,11 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max_low,
#ifdef CONFIG_HAVE_ARCH_PFN_VALID
int pfn_valid(unsigned long pfn)
{
phys_addr_t addr = __pfn_to_phys(pfn);
if (__phys_to_pfn(addr) != pfn)
return 0;
return memblock_is_map_memory(__pfn_to_phys(pfn));
}
EXPORT_SYMBOL(pfn_valid);
@ -628,7 +633,8 @@ static void update_sections_early(struct section_perm perms[], int n)
if (t->flags & PF_KTHREAD)
continue;
for_each_thread(t, s)
set_section_perms(perms, n, true, s->mm);
if (s->mm)
set_section_perms(perms, n, true, s->mm);
}
set_section_perms(perms, n, true, current->active_mm);
set_section_perms(perms, n, true, &init_mm);