#include #include #include #include #include #include #include #include #include #include int main(int argc, char **argv) { int cpu, fd; long long msr; char msr_file_name[64]; if (argc != 2) return 1; errno = 0; cpu = strtol(argv[1], (char **) NULL, 10); if (errno) return 1; sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu); fd = open(msr_file_name, O_RDONLY); if (fd == -1) { perror("Failed to open"); return 1; } pread(fd, &msr, sizeof(msr), 0x199); printf("msr 0x199: 0x%llx\n", msr); return 0; } t repository'/>
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authorChristoph Hellwig <hch@lst.de>2017-02-05 18:10:35 +0100
committerJens Axboe <axboe@fb.com>2017-02-06 09:34:46 -0700
commiteeeefd41843218c55a8782a6920f044d9bf6207a (patch)
treec342eac46626e62745aa8e1a982626efca8b121d /sound/usb/usx2y/usx2yhwdeppcm.c
parentc14024dbb156c8392908aaa822097d27c6af8ec8 (diff)
block: don't try Write Same from __blkdev_issue_zeroout
Write Same can return an error asynchronously if it turns out the underlying SCSI device does not support Write Same, which makes a proper fallback to other methods in __blkdev_issue_zeroout impossible. Thus only issue a Write Same from blkdev_issue_zeroout an don't try it at all from __blkdev_issue_zeroout as a non-invasive workaround. Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Junichi Nomura <j-nomura@ce.jp.nec.com> Fixes: e73c23ff ("block: add async variant of blkdev_issue_zeroout") Tested-by: Junichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'sound/usb/usx2y/usx2yhwdeppcm.c')