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| author | Alexander Gordeev <agordeev@linux.ibm.com> | 2022-07-19 08:16:36 +0300 |
|---|---|---|
| committer | Alexander Gordeev <agordeev@linux.ibm.com> | 2022-07-20 18:21:41 +0300 |
| commit | ebbc9570169147740aa39aee1d61b4cc5a631644 (patch) | |
| tree | 6e20330871a3413057779aed54ebf806b526a681 /arch/s390/include/asm/sclp.h | |
| parent | 6d2e5a4a13da2e91a46a37cd00d23dba8613ad7b (diff) | |
| download | linux-ebbc9570169147740aa39aee1d61b4cc5a631644.tar.xz | |
s390/crash: support multi-segment iterators
Make it possible to handle not only single-, but also multi-
segment iterators in copy_oldmem_iter() callback. Change the
semantics of called functions to match the iterator model -
instead of an error code the exact number of bytes copied is
returned.
The swap page used to copy data to user space is adopted for
kernel space too. That does not bring any performance impact.
Suggested-by: Matthew Wilcox <willy@infradead.org>
Fixes: cc02e6e21aa5 ("s390/crash: add missing iterator advance in copy_oldmem_page()")
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Link: https://lore.kernel.org/r/5af6da3a0bffe48a90b0b7139ecf6a818b2d18e8.1658206891.git.agordeev@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/sclp.h')
| -rw-r--r-- | arch/s390/include/asm/sclp.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/include/asm/sclp.h b/arch/s390/include/asm/sclp.h index 236b34b75ddb..24ee532fab84 100644 --- a/arch/s390/include/asm/sclp.h +++ b/arch/s390/include/asm/sclp.h @@ -17,6 +17,7 @@ #define EXT_SCCB_READ_CPU (3 * PAGE_SIZE) #ifndef __ASSEMBLY__ +#include <linux/uio.h> #include <asm/chpid.h> #include <asm/cpu.h> @@ -142,8 +143,7 @@ int sclp_pci_deconfigure(u32 fid); int sclp_ap_configure(u32 apid); int sclp_ap_deconfigure(u32 apid); int sclp_pci_report(struct zpci_report_error_header *report, u32 fh, u32 fid); -int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count); -int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count); +size_t memcpy_hsa_iter(struct iov_iter *iter, unsigned long src, size_t count); void sclp_ocf_cpc_name_copy(char *dst); static inline int sclp_get_core_info(struct sclp_core_info *info, int early) |