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740b5706b9
In case of reipl cpcmd gets called when all other cpus are not running anymore. To prevent deadlocks change __cpcmd so that it doesn't take any locks and call cpcmd or __cpcmd, whatever is correct in the current context. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
35 lines
1.2 KiB
C
35 lines
1.2 KiB
C
/*
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* arch/s390/kernel/cpcmd.h
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Christian Borntraeger (cborntra@de.ibm.com),
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*/
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#ifndef _ASM_S390_CPCMD_H
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#define _ASM_S390_CPCMD_H
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/*
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* the lowlevel function for cpcmd
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* the caller of __cpcmd has to ensure that the response buffer is below 2 GB
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*/
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extern int __cpcmd(const char *cmd, char *response, int rlen, int *response_code);
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/*
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* cpcmd is the in-kernel interface for issuing CP commands
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*
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* cmd: null-terminated command string, max 240 characters
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* response: response buffer for VM's textual response
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* rlen: size of the response buffer, cpcmd will not exceed this size
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* but will cap the output, if its too large. Everything that
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* did not fit into the buffer will be silently dropped
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* response_code: return pointer for VM's error code
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* return value: the size of the response. The caller can check if the buffer
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* was large enough by comparing the return value and rlen
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* NOTE: If the response buffer is not below 2 GB, cpcmd can sleep
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*/
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extern int cpcmd(const char *cmd, char *response, int rlen, int *response_code);
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#endif /* _ASM_S390_CPCMD_H */
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