linux-toradex.git/arch/sparc/include/asm/pgtable_32.h, branch v4.2.7

mm: make FIRST_USER_ADDRESS unsigned long on all archs

2015-02-12T01:06:03+00:00

LKP has triggered a compiler warning after my recent patch "mm: account
pmd page tables to the process":

    mm/mmap.c: In function 'exit_mmap':
 >> mm/mmap.c:2857:2: warning: right shift count >= width of type [enabled by default]

The code:

 > 2857                WARN_ON(mm_nr_pmds(mm) >
   2858                                round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT);

In this, on tile, we have FIRST_USER_ADDRESS defined as 0.  round_up() has
the same type -- int.  PUD_SHIFT.

I think the best way to fix it is to define FIRST_USER_ADDRESS as unsigned
long.  On every arch for consistency.

Signed-off-by: Kirill A. Shutemov 
Reported-by: Wu Fengguang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

sparc32: fix broken set_pte()

2015-02-12T01:06:01+00:00

32-bit sparc uses swap instruction to implement set_pte().  It called
using GCC inline assembler.  But it misses the "memory" clobber to
indicate that pte value will be updated in memory.

As result GCC doesn't know that it cannot postpone pte pointer dereference
which occurs before set_pte() to post-set_pte() time.

It leads to real-world bugs -- [1]. In this situation we have code:

	ptent = ptep_modify_prot_start(mm, addr, pte);
	ptent = pte_modify(ptent, newprot);
	...
	ptep_modify_prot_commit(mm, addr, pte, ptent);

ptep_modify_prot_start() in sparc case is just 'pte' dereference plus
pte_clear().  pte_clear() calls broken set_pte().  GCC thinks it's valid
to dereference 'pte' again on pte_modify() and gets cleared pte.
ptep_modify_prot_commit() puts 'pteent' with pfn==0 back to page table,
which eventually leads to the crash.

[1] http://lkml.kernel.org/r/54C06B19.8060305@roeck-us.net

Signed-off-by: Kirill A. Shutemov 
Reported-by: Guenter Roeck 
Tested-by: Guenter Roeck 
Cc: Paul Moore 
Cc: Joonsoo Kim 
Cc: David Miller 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

sparc: drop pte_file()-related helpers

2015-02-10T22:30:33+00:00

We've replaced remap_file_pages(2) implementation with emulation.  Nobody
creates non-linear mapping anymore.

This patch also increase number of bits availble for swap offset.

Signed-off-by: Kirill A. Shutemov 
Acked-by: David S. Miller 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

sparc: drop use of extern for prototypes in arch/sparc/include/asm

2014-05-19T02:01:29+00:00

Drop extern for all prototypes and adjust alignment of parameters
as required after the removal.
In a few rare cases adjust linelength to conform to maximum 80 chars,
and likewise in a few rare cases adjust alignment of parameters
to static functions.

Signed-off-by: Sam Ravnborg 
Signed-off-by: David S. Miller

sparc32: fix sparse warning in init_32.c

2014-04-29T05:12:24+00:00

Fix following warning:
init_32.c:112:22: warning: symbol 'bootmem_init' was not declared. Should it be static?

Fix by adding a proper prototype in pgtable_32.h and drop
the local prototype in srmmu.c

Signed-off-by: Sam Ravnborg 
Signed-off-by: David S. Miller

consolidate io_remap_pfn_range definitions

2013-06-29T08:46:35+00:00

Signed-off-by: Al Viro

sparc32: drop unused BAD_PAGE stuff

2012-07-26T23:46:16+00:00

Signed-off-by: Sam Ravnborg 
Signed-off-by: David S. Miller

sparc32: centralize all mmu context handling in srmmu.c

2012-07-26T23:46:16+00:00

Signed-off-by: Sam Ravnborg 
Signed-off-by: David S. Miller

sparc32: drop swapper_pg_dir

2012-07-26T23:46:15+00:00

We save one page of RAM dropping swapper_pg_dir.
It was only used for an assignment in init-mm.c and we
redid this later in srmmu.c anyway.

This is likely a left-over from the sun4c removal.

To avoid a dummy variable we use a simple #define swapper_pg_dir NULL

Signed-off-by: Sam Ravnborg 
Signed-off-by: David S. Miller

sparc32: cleanup mm/fault_32.c

2012-05-15T17:43:48+00:00

- remove unused variables
- fix coding style issues that hurts my eyes

Signed-off-by: Sam Ravnborg 
Signed-off-by: David S. Miller