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authorLinus Torvalds <torvalds@linux-foundation.org>2012-09-22 12:40:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-09-22 12:40:16 -0700
commitb3a297d15b8f1be8304f0e0a3bbbb47b5f019939 (patch)
tree6f2b69a86bf55ba0ef2ff6b30f647965377c8d3e /arch/arm
parentcead24c1181ad199354bd08013d0f9d08b66691b (diff)
parentbf619faeced5c2beb32a39559e1f1117f88fd702 (diff)
Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm
Pull ARM and clkdev fixes from Russell King: "Two patches for clkdev which resolve the long standing issue that the devm_* versions were dependent on clkdev, which they shouldn't have been. Instead, they're dependent on HAVE_CLK instead, which implies that you're providing clk_get() and clk_put(). A small fix to the ARM decompressor to ensure that the page tables are properly interpreted by the CPU, and reserve syscall 378 for kcmp (the checksyscalls.sh script is unfortunately currently broken so arch maintainers aren't getting notified of new syscalls...) Lastly, a larger fix for an issue between the common clk subsystem and smp_twd which causes warnings to be spat out." * 'fixes' of git://git.linaro.org/people/rmk/linux-arm: ARM: reserve syscall 378 for kcmp ARM: 7535/1: Reprogram smp_twd based on new common clk framework notifiers ARM: 7537/1: clk: Fix release in devm_clk_put() ARM: 7532/1: decompressor: reset SCTLR.TRE for VMSA ARMv7 cores ARM: 7534/1: clk: Make the managed clk functions generically available
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/boot/compressed/head.S1
-rw-r--r--arch/arm/include/asm/unistd.h2
-rw-r--r--arch/arm/kernel/calls.S1
-rw-r--r--arch/arm/kernel/smp_twd.c48
4 files changed, 50 insertions, 2 deletions
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 81769c1341f..bc67cbff394 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -653,6 +653,7 @@ __armv7_mmu_cache_on:
mcrne p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
#endif
mrc p15, 0, r0, c1, c0, 0 @ read control reg
+ bic r0, r0, #1 << 28 @ clear SCTLR.TRE
orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement
orr r0, r0, #0x003c @ write buffer
#ifdef CONFIG_MMU
diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h
index 0cab47d4a83..2fde5fd1acc 100644
--- a/arch/arm/include/asm/unistd.h
+++ b/arch/arm/include/asm/unistd.h
@@ -404,6 +404,7 @@
#define __NR_setns (__NR_SYSCALL_BASE+375)
#define __NR_process_vm_readv (__NR_SYSCALL_BASE+376)
#define __NR_process_vm_writev (__NR_SYSCALL_BASE+377)
+ /* 378 for kcmp */
/*
* The following SWIs are ARM private.
@@ -483,6 +484,7 @@
*/
#define __IGNORE_fadvise64_64
#define __IGNORE_migrate_pages
+#define __IGNORE_kcmp
#endif /* __KERNEL__ */
#endif /* __ASM_ARM_UNISTD_H */
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 463ff4a0ec8..e337879595e 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -387,6 +387,7 @@
/* 375 */ CALL(sys_setns)
CALL(sys_process_vm_readv)
CALL(sys_process_vm_writev)
+ CALL(sys_ni_syscall) /* reserved for sys_kcmp */
#ifndef syscalls_counted
.equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
#define syscalls_counted
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index fef42b21cec..e1f906989bb 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -11,7 +11,6 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/clk.h>
-#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
@@ -96,7 +95,52 @@ static void twd_timer_stop(struct clock_event_device *clk)
disable_percpu_irq(clk->irq);
}
-#ifdef CONFIG_CPU_FREQ
+#ifdef CONFIG_COMMON_CLK
+
+/*
+ * Updates clockevent frequency when the cpu frequency changes.
+ * Called on the cpu that is changing frequency with interrupts disabled.
+ */
+static void twd_update_frequency(void *new_rate)
+{
+ twd_timer_rate = *((unsigned long *) new_rate);
+
+ clockevents_update_freq(*__this_cpu_ptr(twd_evt), twd_timer_rate);
+}
+
+static int twd_rate_change(struct notifier_block *nb,
+ unsigned long flags, void *data)
+{
+ struct clk_notifier_data *cnd = data;
+
+ /*
+ * The twd clock events must be reprogrammed to account for the new
+ * frequency. The timer is local to a cpu, so cross-call to the
+ * changing cpu.
+ */
+ if (flags == POST_RATE_CHANGE)
+ smp_call_function(twd_update_frequency,
+ (void *)&cnd->new_rate, 1);
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block twd_clk_nb = {
+ .notifier_call = twd_rate_change,
+};
+
+static int twd_clk_init(void)
+{
+ if (twd_evt && *__this_cpu_ptr(twd_evt) && !IS_ERR(twd_clk))
+ return clk_notifier_register(twd_clk, &twd_clk_nb);
+
+ return 0;
+}
+core_initcall(twd_clk_init);
+
+#elif defined (CONFIG_CPU_FREQ)
+
+#include <linux/cpufreq.h>
/*
* Updates clockevent frequency when the cpu frequency changes.