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Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 

Pull ARM fixes from Russell King:
 "Another round of relatively small ARM fixes.

  Thomas spotted that the strex backoff delay bit was a disable bit, so
  it needed to be clear for this to work.  Vladimir spotted that using a
  restart block for the cache flush operation would return -EINTR, which
  userspace was not expecting.  Dmitry spotted that the auxiliary
  control register accesses for Xscale were not correct"

* 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  ARM: 8226/1: cacheflush: get rid of restarting block
  ARM: 8222/1: mvebu: enable strex backoff delay
  ARM: 8216/1: xscale: correct auxiliary register in suspend/resume
This commit is contained in:
Linus Torvalds 2014-11-28 13:32:47 -08:00
parent 98e8d2e094 3f4aa45cee
commit e818d5ed2a
4 changed files with 4 additions and 44 deletions
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11
arch/arm/include/asm/thread_info.h
View File

@ -44,16 +44,6 @@ struct cpu_context_save {
__u32 extra[2]; /* Xscale 'acc' register, etc */
};
struct arm_restart_block {
union {
/* For user cache flushing */
struct {
unsigned long start;
unsigned long end;
} cache;
};
};
/*
* low level task data that entry.S needs immediate access to.
* __switch_to() assumes cpu_context follows immediately after cpu_domain.
@ -79,7 +69,6 @@ struct thread_info {
unsigned long thumbee_state; /* ThumbEE Handler Base register */
#endif
struct restart_block restart_block;
struct arm_restart_block arm_restart_block;
};
#define INIT_THREAD_INFO(tsk) \

31
arch/arm/kernel/traps.c
View File

@ -533,8 +533,6 @@ static int bad_syscall(int n, struct pt_regs *regs)
return regs->ARM_r0;
}
static long do_cache_op_restart(struct restart_block *);
static inline int
__do_cache_op(unsigned long start, unsigned long end)
{
@ -543,24 +541,8 @@ __do_cache_op(unsigned long start, unsigned long end)
do {
unsigned long chunk = min(PAGE_SIZE, end - start);
if (signal_pending(current)) {
struct thread_info *ti = current_thread_info();
ti->restart_block = (struct restart_block) {
.fn = do_cache_op_restart,
};
ti->arm_restart_block = (struct arm_restart_block) {
{
.cache = {
.start = start,
.end = end,
},
},
};
return -ERESTART_RESTARTBLOCK;
}
if (fatal_signal_pending(current))
return 0;
ret = flush_cache_user_range(start, start + chunk);
if (ret)
@ -573,15 +555,6 @@ __do_cache_op(unsigned long start, unsigned long end)
return 0;
}
static long do_cache_op_restart(struct restart_block *unused)
{
struct arm_restart_block *restart_block;
restart_block = &current_thread_info()->arm_restart_block;
return __do_cache_op(restart_block->cache.start,
restart_block->cache.end);
}
static inline int
do_cache_op(unsigned long start, unsigned long end, int flags)
{

2
arch/arm/mm/proc-v7.S
View File

@ -270,7 +270,6 @@ __v7_pj4b_setup:
/* Auxiliary Debug Modes Control 1 Register */
#define PJ4B_STATIC_BP (1 << 2) /* Enable Static BP */
#define PJ4B_INTER_PARITY (1 << 8) /* Disable Internal Parity Handling */
#define PJ4B_BCK_OFF_STREX (1 << 5) /* Enable the back off of STREX instr */
#define PJ4B_CLEAN_LINE (1 << 16) /* Disable data transfer for clean line */
/* Auxiliary Debug Modes Control 2 Register */
@ -293,7 +292,6 @@ __v7_pj4b_setup:
/* Auxiliary Debug Modes Control 1 Register */
mrc p15, 1, r0, c15, c1, 1
orr r0, r0, #PJ4B_CLEAN_LINE
orr r0, r0, #PJ4B_BCK_OFF_STREX
orr r0, r0, #PJ4B_INTER_PARITY
bic r0, r0, #PJ4B_STATIC_BP
mcr p15, 1, r0, c15, c1, 1

4
arch/arm/mm/proc-xscale.S
View File

@ -535,7 +535,7 @@ ENTRY(cpu_xscale_do_suspend)
mrc p15, 0, r5, c15, c1, 0 @ CP access reg
mrc p15, 0, r6, c13, c0, 0 @ PID
mrc p15, 0, r7, c3, c0, 0 @ domain ID
mrc p15, 0, r8, c1, c1, 0 @ auxiliary control reg
mrc p15, 0, r8, c1, c0, 1 @ auxiliary control reg
mrc p15, 0, r9, c1, c0, 0 @ control reg
bic r4, r4, #2 @ clear frequency change bit
stmia r0, {r4 - r9} @ store cp regs
@ -552,7 +552,7 @@ ENTRY(cpu_xscale_do_resume)
mcr p15, 0, r6, c13, c0, 0 @ PID
mcr p15, 0, r7, c3, c0, 0 @ domain ID
mcr p15, 0, r1, c2, c0, 0 @ translation table base addr
mcr p15, 0, r8, c1, c1, 0 @ auxiliary control reg
mcr p15, 0, r8, c1, c0, 1 @ auxiliary control reg
mov r0, r9 @ control register
b cpu_resume_mmu
ENDPROC(cpu_xscale_do_resume)