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Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze

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Pull microblaze changes from Michal Simek.

* 'next' of git://git.monstr.eu/linux-2.6-microblaze:
  microblaze: Setup correct pointer to TLS area
  microblaze: Add TLS support to sys_clone
  microblaze: ftrace: Pass the first calling instruction for dynamic ftrace
  microblaze: Port OOM changes to do_page_fault
  microblaze: Do not select GENERIC_GPIO by default
This commit is contained in:
Linus Torvalds 2012-05-28 09:49:56 -07:00
commit fb8b00675e
5 changed files with 39 additions and 11 deletions
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2
arch/microblaze/Kconfig
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@ -52,7 +52,7 @@ config GENERIC_CALIBRATE_DELAY
def_bool y
config GENERIC_GPIO
def_bool y
bool
config GENERIC_CSUM
def_bool y

7
arch/microblaze/kernel/entry.S
View File

@ -492,10 +492,11 @@ C_ENTRY(sys_clone):
bnei r6, 1f; /* See if child SP arg (arg 1) is 0. */
lwi r6, r1, PT_R1; /* If so, use paret's stack ptr */
1: addik r7, r1, 0; /* Arg 2: parent context */
add r8, r0, r0; /* Arg 3: (unused) */
add r9, r0, r0; /* Arg 4: (unused) */
lwi r9, r1, PT_R8; /* parent tid. */
lwi r10, r1, PT_R9; /* child tid. */
/* do_fork will pick up TLS from regs->r10. */
brid do_fork /* Do real work (tail-call) */
add r10, r0, r0; /* Arg 5: (unused) */
add r8, r0, r0; /* Arg 3: (unused) */
C_ENTRY(sys_execve):
brid microblaze_execve; /* Do real work (tail-call).*/

2
arch/microblaze/kernel/mcount.S
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@ -138,7 +138,7 @@ NOALIGN_ENTRY(ftrace_call)
#endif /* CONFIG_DYNAMIC_FTRACE */
/* static normal trace */
lwi r6, r1, 120; /* MS: load parent addr */
addik r5, r15, 0; /* MS: load current function addr */
addik r5, r15, -4; /* MS: load current function addr */
/* MS: here is dependency on previous code */
brald r15, r20; /* MS: jump to ftrace handler */
nop;

6
arch/microblaze/kernel/process.c
View File

@ -182,8 +182,12 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
#endif
ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;
/*
* r21 is the thread reg, r10 is 6th arg to clone
* which contains TLS area
*/
if (clone_flags & CLONE_SETTLS)
;
childregs->r21 = childregs->r10;
return 0;
}

33
arch/microblaze/mm/fault.c
View File

@ -92,6 +92,8 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
int code = SEGV_MAPERR;
int is_write = error_code & ESR_S;
int fault;
unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE |
(is_write ? FAULT_FLAG_WRITE : 0);
regs->ear = address;
regs->esr = error_code;
@ -138,6 +140,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long address,
if (kernel_mode(regs) && !search_exception_tables(regs->pc))
goto bad_area_nosemaphore;
retry:
down_read(&mm->mmap_sem);
}
@ -210,7 +213,11 @@ good_area:
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
fault = handle_mm_fault(mm, vma, address, is_write ? FAULT_FLAG_WRITE : 0);
fault = handle_mm_fault(mm, vma, address, flags);
if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
return;
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
@ -218,11 +225,27 @@ good_area:
goto do_sigbus;
BUG();
}
if (unlikely(fault & VM_FAULT_MAJOR))
current->maj_flt++;
else
current->min_flt++;
if (flags & FAULT_FLAG_ALLOW_RETRY) {
if (unlikely(fault & VM_FAULT_MAJOR))
current->maj_flt++;
else
current->min_flt++;
if (fault & VM_FAULT_RETRY) {
flags &= ~FAULT_FLAG_ALLOW_RETRY;
/*
* No need to up_read(&mm->mmap_sem) as we would
* have already released it in __lock_page_or_retry
* in mm/filemap.c.
*/
goto retry;
}
}
up_read(&mm->mmap_sem);
/*
* keep track of tlb+htab misses that are good addrs but
* just need pte's created via handle_mm_fault()