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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-16 18:28:25 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-16 18:28:25 (GMT) |
| commit | 0f689a33ad17845363acdc6d52783befd6ad116c (patch) | |
| tree | 88d1c183fc6f223de431ae8bdc86137481721f2c /arch/s390/include/asm | |
| parent | 7d38cc02909b85f6f4d3f082c471f0151fc5be3e (diff) | |
| parent | 5896f8fe491891f551bdc6574bbc4a07c054c30b (diff) | |
| download | linux-0f689a33ad17845363acdc6d52783befd6ad116c.tar.xz | |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 patches from Martin Schwidefsky:
"An update to the oops output with additional information about the
crash. The renameat2 system call is enabled. Two patches in regard
to the PTR_ERR_OR_ZERO cleanup. And a bunch of bug fixes"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/sclp_cmd: replace PTR_RET with PTR_ERR_OR_ZERO
s390/sclp: replace PTR_RET with PTR_ERR_OR_ZERO
s390/sclp_vt220: Fix kernel panic due to early terminal input
s390/compat: fix typo
s390/uaccess: fix possible register corruption in strnlen_user_srst()
s390: add 31 bit warning message
s390: wire up sys_renameat2
s390: show_registers() should not map user space addresses to kernel symbols
s390/mm: print control registers and page table walk on crash
s390/smp: fix smp_stop_cpu() for !CONFIG_SMP
s390: fix control register update
Diffstat (limited to 'arch/s390/include/asm')
| -rw-r--r-- | arch/s390/include/asm/sigp.h | 19 | ||||
| -rw-r--r-- | arch/s390/include/asm/smp.h | 13 |
2 files changed, 31 insertions, 1 deletions
diff --git a/arch/s390/include/asm/sigp.h b/arch/s390/include/asm/sigp.h index d091aa1..bf9c823 100644 --- a/arch/s390/include/asm/sigp.h +++ b/arch/s390/include/asm/sigp.h @@ -31,4 +31,23 @@ #define SIGP_STATUS_INCORRECT_STATE 0x00000200UL #define SIGP_STATUS_NOT_RUNNING 0x00000400UL +#ifndef __ASSEMBLY__ + +static inline int __pcpu_sigp(u16 addr, u8 order, u32 parm, u32 *status) +{ + register unsigned int reg1 asm ("1") = parm; + int cc; + + asm volatile( + " sigp %1,%2,0(%3)\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (cc), "+d" (reg1) : "d" (addr), "a" (order) : "cc"); + if (status && cc == 1) + *status = reg1; + return cc; +} + +#endif /* __ASSEMBLY__ */ + #endif /* __S390_ASM_SIGP_H */ diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h index 1607793..21703f8 100644 --- a/arch/s390/include/asm/smp.h +++ b/arch/s390/include/asm/smp.h @@ -7,6 +7,8 @@ #ifndef __ASM_SMP_H #define __ASM_SMP_H +#include <asm/sigp.h> + #ifdef CONFIG_SMP #include <asm/lowcore.h> @@ -50,9 +52,18 @@ static inline int smp_store_status(int cpu) { return 0; } static inline int smp_vcpu_scheduled(int cpu) { return 1; } static inline void smp_yield_cpu(int cpu) { } static inline void smp_yield(void) { } -static inline void smp_stop_cpu(void) { } static inline void smp_fill_possible_mask(void) { } +static inline void smp_stop_cpu(void) +{ + u16 pcpu = stap(); + + for (;;) { + __pcpu_sigp(pcpu, SIGP_STOP, 0, NULL); + cpu_relax(); + } +} + #endif /* CONFIG_SMP */ #ifdef CONFIG_HOTPLUG_CPU |