Merge branch 'next' of git://git.monstr.eu/linux-2.6-microblaze
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
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 8346046..0bf4423 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -52,7 +52,7 @@
def_bool y
config GENERIC_GPIO
- def_bool y
+ bool
config GENERIC_CSUM
def_bool y
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
index daff9e5..03f7b8c 100644
--- a/arch/microblaze/kernel/entry.S
+++ b/arch/microblaze/kernel/entry.S
@@ -492,10 +492,11 @@
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).*/
diff --git a/arch/microblaze/kernel/mcount.S b/arch/microblaze/kernel/mcount.S
index e7eaa7a..fc1e132 100644
--- a/arch/microblaze/kernel/mcount.S
+++ b/arch/microblaze/kernel/mcount.S
@@ -138,7 +138,7 @@
#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;
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 883b927..1944e00 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -182,8 +182,12 @@
#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;
}
diff --git a/arch/microblaze/mm/fault.c b/arch/microblaze/mm/fault.c
index c38a265..eb365d6 100644
--- a/arch/microblaze/mm/fault.c
+++ b/arch/microblaze/mm/fault.c
@@ -92,6 +92,8 @@
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 @@
if (kernel_mode(regs) && !search_exception_tables(regs->pc))
goto bad_area_nosemaphore;
+retry:
down_read(&mm->mmap_sem);
}
@@ -210,7 +213,11 @@
* 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 @@
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()