Messages in this thread Patch in this message | | | From | Sebastien Boisvert <> | Subject | [PATCH] pfn_t: force '~' to be parsed as an unary operator | Date | Sun, 21 Oct 2018 10:59:39 -0400 |
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Tracing the event "fs_dax:dax_pmd_insert_mapping" with perf produces this warning: [fs_dax:dax_pmd_insert_mapping] unknown op '~'
It is printed in process_op (tools/lib/traceevent/event-parse.c) because '~' is parsed as a binary operator.
perf reads the format of fs_dax:dax_pmd_insert_mapping ("print fmt") from /sys/kernel/debug/tracing/events/fs_dax/dax_pmd_insert_mapping/format .
The format contains:
~(((u64) ~(~(((1UL) << 12)-1))) ^ \ interpreted as a binary operator by process_op().
This part is generated in the declaration of the event class dax_pmd_insert_mapping_class in include/trace/events/fs_dax.h :
__print_flags_u64(__entry->pfn_val & PFN_FLAGS_MASK, "|", PFN_FLAGS_TRACE),
This patch adds a pair of parentheses in the declaration of PFN_FLAGS_MASK to make sure that '~' is parsed as a unary operator by perf.
The part of the format that was problematic is now:
~(((u64) (~(~(((1UL) << 12)-1))))
Now, all the '~' are parsed as unary operators.
Cc: Dan Williams <dan.j.williams@intel.com> Cc: "Steven Rostedt (VMware)" <rostedt@goodmis.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Ross Zwisler <zwisler@kernel.org> Cc: Elenie Godzaridis <arangradient@gmail.com> Cc: linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Sebastien Boisvert <sebhtml@videotron.qc.ca> --- include/linux/pfn_t.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h index 21713dc14ce2..673546ba7342 100644 --- a/include/linux/pfn_t.h +++ b/include/linux/pfn_t.h @@ -10,7 +10,7 @@ * PFN_DEV - pfn is not covered by system memmap by default * PFN_MAP - pfn has a dynamic page mapping established by a device driver */ -#define PFN_FLAGS_MASK (((u64) ~PAGE_MASK) << (BITS_PER_LONG_LONG - PAGE_SHIFT)) +#define PFN_FLAGS_MASK (((u64) (~PAGE_MASK)) << (BITS_PER_LONG_LONG - PAGE_SHIFT)) #define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1)) #define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2)) #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3)) -- 2.17.1
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