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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2019-04-30 12:33:45 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2019-05-02 13:54:11 +0200
commit98587c2d894c34c9af5cd84ca169e1cd493aa692 (patch)
treecced9b62cec4042ed7567fa3f834e861d4b73487
parents390/ftrace: use HAVE_FUNCTION_GRAPH_RET_ADDR_PTR (diff)
downloadlinux-dev-98587c2d894c34c9af5cd84ca169e1cd493aa692.tar.xz
linux-dev-98587c2d894c34c9af5cd84ca169e1cd493aa692.zip
s390: simplify disabled_wait
The disabled_wait() function uses its argument as the PSW address when it stops the CPU with a wait PSW that is disabled for interrupts. The different callers sometimes use a specific number like 0xdeadbeef to indicate a specific failure, the early boot code uses 0 and some other calls sites use __builtin_return_address(0). At the time a dump is created the current PSW and the registers of a CPU are written to lowcore to make them avaiable to the dump analysis tool. For a CPU stopped with disabled_wait the PSW and the registers do not really make sense together, the PSW address does not point to the function the registers belong to. Simplify disabled_wait() by using _THIS_IP_ for the PSW address and drop the argument to the function. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/boot/als.c2
-rw-r--r--arch/s390/boot/startup.c2
-rw-r--r--arch/s390/include/asm/processor.h4
-rw-r--r--arch/s390/kernel/early.c4
-rw-r--r--arch/s390/kernel/early_nobss.c2
-rw-r--r--arch/s390/kernel/ipl.c4
-rw-r--r--arch/s390/kernel/machine_kexec.c4
-rw-r--r--arch/s390/kernel/nmi.c2
-rw-r--r--kernel/panic.c7
9 files changed, 13 insertions, 18 deletions
diff --git a/arch/s390/boot/als.c b/arch/s390/boot/als.c
index f902215e9cd9..ff6801d401c4 100644
--- a/arch/s390/boot/als.c
+++ b/arch/s390/boot/als.c
@@ -99,7 +99,7 @@ static void facility_mismatch(void)
print_machine_type();
print_missing_facilities();
sclp_early_printk("See Principles of Operations for facility bits\n");
- disabled_wait(0x8badcccc);
+ disabled_wait();
}
void verify_facilities(void)
diff --git a/arch/s390/boot/startup.c b/arch/s390/boot/startup.c
index 4401e992bda1..7b0d05414618 100644
--- a/arch/s390/boot/startup.c
+++ b/arch/s390/boot/startup.c
@@ -57,7 +57,7 @@ void error(char *x)
sclp_early_printk(x);
sclp_early_printk("\n\n -- System halted");
- disabled_wait(0xdeadbeef);
+ disabled_wait();
}
#ifdef CONFIG_KERNEL_UNCOMPRESSED
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 9f2ff4a54aff..b0fcbc37b637 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -315,12 +315,12 @@ void enabled_wait(void);
/*
* Function to drop a processor into disabled wait state
*/
-static inline void __noreturn disabled_wait(unsigned long code)
+static inline void __noreturn disabled_wait(void)
{
psw_t psw;
psw.mask = PSW_MASK_BASE | PSW_MASK_WAIT | PSW_MASK_BA | PSW_MASK_EA;
- psw.addr = code;
+ psw.addr = _THIS_IP_;
__load_psw(psw);
while (1);
}
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 33f704c16bd3..629f173f60cd 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -141,7 +141,7 @@ static void early_pgm_check_handler(void)
addr = S390_lowcore.program_old_psw.addr;
fixup = s390_search_extables(addr);
if (!fixup)
- disabled_wait(0);
+ disabled_wait();
/* Disable low address protection before storing into lowcore. */
__ctl_store(cr0, 0, 0);
cr0_new = cr0 & ~(1UL << 28);
@@ -298,7 +298,7 @@ static void __init check_image_bootable(void)
sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
- disabled_wait(0xbadb007);
+ disabled_wait();
}
void __init startup_init(void)
diff --git a/arch/s390/kernel/early_nobss.c b/arch/s390/kernel/early_nobss.c
index 8d73f7fae16e..52a3ef959341 100644
--- a/arch/s390/kernel/early_nobss.c
+++ b/arch/s390/kernel/early_nobss.c
@@ -25,7 +25,7 @@ static void __init reset_tod_clock(void)
return;
/* TOD clock not running. Set the clock to Unix Epoch. */
if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
- disabled_wait(0);
+ disabled_wait();
memset(tod_clock_base, 0, 16);
*(__u64 *) &tod_clock_base[1] = TOD_UNIX_EPOCH;
diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index aa8fe768640e..d836af3ccc38 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -920,7 +920,7 @@ static void __reipl_run(void *unused)
case IPL_TYPE_FCP_DUMP:
break;
}
- disabled_wait((unsigned long) __builtin_return_address(0));
+ disabled_wait();
}
static void reipl_run(struct shutdown_trigger *trigger)
@@ -1375,7 +1375,7 @@ static void stop_run(struct shutdown_trigger *trigger)
{
if (strcmp(trigger->name, ON_PANIC_STR) == 0 ||
strcmp(trigger->name, ON_RESTART_STR) == 0)
- disabled_wait((unsigned long) __builtin_return_address(0));
+ disabled_wait();
smp_stop_cpu();
}
diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index 2f3a742a71a5..8a1ae140c5e2 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -96,7 +96,7 @@ static void __do_machine_kdump(void *image)
start_kdump(1);
/* Die if start_kdump returns */
- disabled_wait((unsigned long) __builtin_return_address(0));
+ disabled_wait();
}
/*
@@ -284,7 +284,7 @@ static void __do_machine_kexec(void *data)
(*data_mover)(&image->head, image->start);
/* Die if kexec returns */
- disabled_wait((unsigned long) __builtin_return_address(0));
+ disabled_wait();
}
/*
diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c
index 8c867b43c8eb..0a487fae763e 100644
--- a/arch/s390/kernel/nmi.c
+++ b/arch/s390/kernel/nmi.c
@@ -125,7 +125,7 @@ void nmi_free_per_cpu(struct lowcore *lc)
static notrace void s390_handle_damage(void)
{
smp_emergency_stop();
- disabled_wait((unsigned long) __builtin_return_address(0));
+ disabled_wait();
while (1);
}
NOKPROBE_SYMBOL(s390_handle_damage);
diff --git a/kernel/panic.c b/kernel/panic.c
index 0ae0d7332f12..c1fcaad337b7 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -318,12 +318,7 @@ void panic(const char *fmt, ...)
}
#endif
#if defined(CONFIG_S390)
- {
- unsigned long caller;
-
- caller = (unsigned long)__builtin_return_address(0);
- disabled_wait(caller);
- }
+ disabled_wait();
#endif
pr_emerg("---[ end Kernel panic - not syncing: %s ]---\n", buf);
local_irq_enable();