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| author | jhb <jhb@FreeBSD.org> | 2017-01-18 19:38:53 +0000 |
|---|---|---|
| committer | jhb <jhb@FreeBSD.org> | 2017-01-18 19:38:53 +0000 |
| commit | 408517410d34e87f7bbc6d985b7b49d60ae40e1d (patch) | |
| tree | e17792e86cde13f5e919550b89e0e1ab25a0c94a /sys/powerpc | |
| parent | 4d4bfe27534638421ca344bba7e3ed69a6008615 (diff) | |
| download | FreeBSD-src-408517410d34e87f7bbc6d985b7b49d60ae40e1d.zip FreeBSD-src-408517410d34e87f7bbc6d985b7b49d60ae40e1d.tar.gz | |
MFC 307332,312086: Drop support for using mmap() with /dev/kmem.
307332:
Drop support for using mmap() with /dev/kmem.
Using the device pager with /dev/kmem is not stable since KVA mappings
are transient, but the device pager caches the PA associated with a
given offset forever. Interestingly, mips' implementation of
memmap() already refused requests for /dev/kmem.
Note that kvm_read/kvm_write do not use mmap, but use read and write on
/dev/kmem, so this should not affect libkvm users.
312086:
Trim a few comments on platforms that did not implement mmap of /dev/kmem.
After r307332, no platforms implement mmap for /dev/kmem, so the lack of
it for these platforms is no longer unique.
Diffstat (limited to 'sys/powerpc')
| -rw-r--r-- | sys/powerpc/powerpc/mem.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/sys/powerpc/powerpc/mem.c b/sys/powerpc/powerpc/mem.c index a7fbfa3..2bc89fd 100644 --- a/sys/powerpc/powerpc/mem.c +++ b/sys/powerpc/powerpc/mem.c @@ -179,8 +179,6 @@ memmmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, if (dev2unit(dev) == CDEV_MINOR_MEM) *paddr = offset; - else if (dev2unit(dev) == CDEV_MINOR_KMEM) - *paddr = vtophys(offset); else return (EFAULT); |
