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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2017-08-07 15:16:15 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-08-09 15:09:35 +0200 |
| commit | cd4386a931b6310b05559d2e28efda04d30ab593 (patch) | |
| tree | d1fbc2a6a8e86af9308ce8713e842e6717471c8e /arch/s390/include | |
| parent | s390/vmcp: fix uaccess check and avoid undefined behavior (diff) | |
| download | linux-cd4386a931b6310b05559d2e28efda04d30ab593.tar.xz linux-cd4386a931b6310b05559d2e28efda04d30ab593.zip | |
s390/cpcmd,vmcp: avoid GFP_DMA allocations
According to the CP Programming Services manual Diagnose Code 8
"Virtual Console Function" can be used in all addressing modes. Also
the input and output buffers do not have a limitation which specifies
they need to be below the 2GB line.
This is true at least since z/VM 5.4.
Therefore remove the sam31/64 instructions and allow for simple
GFP_KERNEL allocations. This makes it easier to allocate a 1MB page
if the user requested such a large return buffer.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
| -rw-r--r-- | arch/s390/include/asm/cpcmd.h | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/s390/include/asm/cpcmd.h b/arch/s390/include/asm/cpcmd.h index 3dfadb5d648f..ca2b0624ad46 100644 --- a/arch/s390/include/asm/cpcmd.h +++ b/arch/s390/include/asm/cpcmd.h @@ -10,9 +10,8 @@ /* * the lowlevel function for cpcmd - * the caller of __cpcmd has to ensure that the response buffer is below 2 GB */ -extern int __cpcmd(const char *cmd, char *response, int rlen, int *response_code); +int __cpcmd(const char *cmd, char *response, int rlen, int *response_code); /* * cpcmd is the in-kernel interface for issuing CP commands @@ -25,8 +24,8 @@ extern int __cpcmd(const char *cmd, char *response, int rlen, int *response_code * response_code: return pointer for VM's error code * return value: the size of the response. The caller can check if the buffer * was large enough by comparing the return value and rlen - * NOTE: If the response buffer is not below 2 GB, cpcmd can sleep + * NOTE: If the response buffer is not in real storage, cpcmd can sleep */ -extern int cpcmd(const char *cmd, char *response, int rlen, int *response_code); +int cpcmd(const char *cmd, char *response, int rlen, int *response_code); #endif /* _ASM_S390_CPCMD_H */ |