From e09b41010ba33a20a87472ee821fa407a5b8da36 Mon Sep 17 00:00:00 2001 From: José Pekkarinen Date: Mon, 11 Apr 2016 10:41:07 +0300 Subject: These changes are the raw update to linux-4.4.6-rt14. Kernel sources are taken from kernel.org, and rt patch from the rt wiki download page. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen --- kernel/arch/s390/lib/delay.c | 31 +++++++++++++++---------------- kernel/arch/s390/lib/find.c | 4 +--- kernel/arch/s390/lib/spinlock.c | 4 ++-- kernel/arch/s390/lib/uaccess.c | 27 +++++++-------------------- 4 files changed, 25 insertions(+), 41 deletions(-) (limited to 'kernel/arch/s390/lib') diff --git a/kernel/arch/s390/lib/delay.c b/kernel/arch/s390/lib/delay.c index 16dc42d83..501dcd4ca 100644 --- a/kernel/arch/s390/lib/delay.c +++ b/kernel/arch/s390/lib/delay.c @@ -12,8 +12,10 @@ #include #include #include +#include #include #include +#include void __delay(unsigned long loops) { @@ -26,29 +28,26 @@ void __delay(unsigned long loops) */ asm volatile("0: brct %0,0b" : : "d" ((loops/2) + 1)); } +EXPORT_SYMBOL(__delay); static void __udelay_disabled(unsigned long long usecs) { - unsigned long cr0, cr6, new; - u64 clock_saved, end; + unsigned long cr0, cr0_new, psw_mask; + struct s390_idle_data idle; + u64 end; end = get_tod_clock() + (usecs << 12); - clock_saved = local_tick_disable(); __ctl_store(cr0, 0, 0); - __ctl_store(cr6, 6, 6); - new = (cr0 & 0xffff00e0) | 0x00000800; - __ctl_load(new , 0, 0); - new = 0; - __ctl_load(new, 6, 6); - lockdep_off(); - do { - set_clock_comparator(end); - enabled_wait(); - } while (get_tod_clock_fast() < end); - lockdep_on(); + cr0_new = cr0 & ~CR0_IRQ_SUBCLASS_MASK; + cr0_new |= (1UL << (63 - 52)); /* enable clock comparator irq */ + __ctl_load(cr0_new, 0, 0); + psw_mask = __extract_psw() | PSW_MASK_EXT | PSW_MASK_WAIT; + set_clock_comparator(end); + set_cpu_flag(CIF_IGNORE_IRQ); + psw_idle(&idle, psw_mask); + clear_cpu_flag(CIF_IGNORE_IRQ); + set_clock_comparator(S390_lowcore.clock_comparator); __ctl_load(cr0, 0, 0); - __ctl_load(cr6, 6, 6); - local_tick_enable(clock_saved); } static void __udelay_enabled(unsigned long long usecs) diff --git a/kernel/arch/s390/lib/find.c b/kernel/arch/s390/lib/find.c index 922003c1b..d90b9245e 100644 --- a/kernel/arch/s390/lib/find.c +++ b/kernel/arch/s390/lib/find.c @@ -1,10 +1,8 @@ /* * MSB0 numbered special bitops handling. * - * On s390x the bits are numbered: + * The bits are numbered: * |0..............63|64............127|128...........191|192...........255| - * and on s390: - * |0.....31|32....63|64....95|96...127|128..159|160..191|192..223|224..255| * * The reason for this bit numbering is the fact that the hardware sets bits * in a bitmap starting at bit 0 (MSB) and we don't want to scan the bitmap diff --git a/kernel/arch/s390/lib/spinlock.c b/kernel/arch/s390/lib/spinlock.c index d6c9991f7..427aa44b3 100644 --- a/kernel/arch/s390/lib/spinlock.c +++ b/kernel/arch/s390/lib/spinlock.c @@ -197,7 +197,7 @@ void _raw_write_lock_wait(arch_rwlock_t *rw, unsigned int prev) } old = ACCESS_ONCE(rw->lock); owner = ACCESS_ONCE(rw->owner); - smp_rmb(); + smp_mb(); if ((int) old >= 0) { prev = __RAW_LOCK(&rw->lock, 0x80000000, __RAW_OP_OR); old = prev; @@ -231,7 +231,7 @@ void _raw_write_lock_wait(arch_rwlock_t *rw) _raw_compare_and_swap(&rw->lock, old, old | 0x80000000)) prev = old; else - smp_rmb(); + smp_mb(); if ((old & 0x7fffffff) == 0 && (int) prev >= 0) break; if (MACHINE_HAS_CAD) diff --git a/kernel/arch/s390/lib/uaccess.c b/kernel/arch/s390/lib/uaccess.c index 4614d415b..ae4de559e 100644 --- a/kernel/arch/s390/lib/uaccess.c +++ b/kernel/arch/s390/lib/uaccess.c @@ -15,7 +15,7 @@ #include #include -static struct static_key have_mvcos = STATIC_KEY_INIT_FALSE; +static DEFINE_STATIC_KEY_FALSE(have_mvcos); static inline unsigned long copy_from_user_mvcos(void *x, const void __user *ptr, unsigned long size) @@ -104,7 +104,7 @@ static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr, unsigned long __copy_from_user(void *to, const void __user *from, unsigned long n) { - if (static_key_false(&have_mvcos)) + if (static_branch_likely(&have_mvcos)) return copy_from_user_mvcos(to, from, n); return copy_from_user_mvcp(to, from, n); } @@ -177,7 +177,7 @@ static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x, unsigned long __copy_to_user(void __user *to, const void *from, unsigned long n) { - if (static_key_false(&have_mvcos)) + if (static_branch_likely(&have_mvcos)) return copy_to_user_mvcos(to, from, n); return copy_to_user_mvcs(to, from, n); } @@ -240,7 +240,7 @@ static inline unsigned long copy_in_user_mvc(void __user *to, const void __user unsigned long __copy_in_user(void __user *to, const void __user *from, unsigned long n) { - if (static_key_false(&have_mvcos)) + if (static_branch_likely(&have_mvcos)) return copy_in_user_mvcos(to, from, n); return copy_in_user_mvc(to, from, n); } @@ -312,7 +312,7 @@ static inline unsigned long clear_user_xc(void __user *to, unsigned long size) unsigned long __clear_user(void __user *to, unsigned long size) { - if (static_key_false(&have_mvcos)) + if (static_branch_likely(&have_mvcos)) return clear_user_mvcos(to, size); return clear_user_xc(to, size); } @@ -370,23 +370,10 @@ long __strncpy_from_user(char *dst, const char __user *src, long size) } EXPORT_SYMBOL(__strncpy_from_user); -/* - * The "old" uaccess variant without mvcos can be enforced with the - * uaccess_primary kernel parameter. This is mainly for debugging purposes. - */ -static int uaccess_primary __initdata; - -static int __init parse_uaccess_pt(char *__unused) -{ - uaccess_primary = 1; - return 0; -} -early_param("uaccess_primary", parse_uaccess_pt); - static int __init uaccess_init(void) { - if (!uaccess_primary && test_facility(27)) - static_key_slow_inc(&have_mvcos); + if (test_facility(27)) + static_branch_enable(&have_mvcos); return 0; } early_initcall(uaccess_init); -- cgit 1.2.3-korg