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d="scan'208";a="52955350" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , George Dunlap , Ian Jackson , Jan Beulich , Stefano Stabellini , Wei Liu , Julien Grall , Dario Faggioli Subject: [PATCH 6/6] xen/trace: Minor code cleanup Date: Fri, 17 Sep 2021 09:45:59 +0100 Message-ID: <20210917084559.22673-7-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20210917084559.22673-1-andrew.cooper3@citrix.com> References: <20210917084559.22673-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain * Delete trailing whitespace * Replace an opencoded DIV_ROUND_UP() * Drop bogus smp_rmb() - spin_lock_irqsave() has full smp_mb() semantics. Signed-off-by: Andrew Cooper --- CC: George Dunlap CC: Ian Jackson CC: Jan Beulich CC: Stefano Stabellini CC: Wei Liu CC: Julien Grall CC: Dario Faggioli --- xen/common/trace.c | 37 +++++++++++++++---------------------- xen/include/asm-x86/hvm/trace.h | 2 +- 2 files changed, 16 insertions(+), 23 deletions(-) diff --git a/xen/common/trace.c b/xen/common/trace.c index 25af6e1bd25e..18008df69e10 100644 --- a/xen/common/trace.c +++ b/xen/common/trace.c @@ -75,10 +75,6 @@ static cpumask_t tb_cpu_mask; /* which tracing events are enabled */ static u32 tb_event_mask = TRC_ALL; -/* Return the number of elements _type necessary to store at least _x bytes of data - * i.e., sizeof(_type) * ans >= _x. */ -#define fit_to_type(_type, _x) (((_x)+sizeof(_type)-1) / sizeof(_type)) - static int cpu_callback( struct notifier_block *nfb, unsigned long action, void *hcpu) { @@ -96,8 +92,8 @@ static struct notifier_block cpu_nfb = { static uint32_t calc_tinfo_first_offset(void) { - int offset_in_bytes = offsetof(struct t_info, mfn_offset[NR_CPUS]); - return fit_to_type(uint32_t, offset_in_bytes); + return DIV_ROUND_UP(offsetof(struct t_info, mfn_offset[NR_CPUS]), + sizeof(uint32_t)); } /** @@ -148,7 +144,7 @@ static int calculate_tbuf_size(unsigned int pages, uint16_t t_info_first_offset) pages = max_pages; } - /* + /* * NB this calculation is correct, because t_info_first_offset is * in words, not bytes */ @@ -167,7 +163,7 @@ static int calculate_tbuf_size(unsigned int pages, uint16_t t_info_first_offset) * trace buffers. The trace buffers are then available for debugging use, via * the %TRACE_xD macros exported in . * - * This function may also be called later when enabling trace buffers + * This function may also be called later when enabling trace buffers * via the SET_SIZE hypercall. */ static int alloc_trace_bufs(unsigned int pages) @@ -401,7 +397,7 @@ int tb_control(struct xen_sysctl_tbuf_op *tbc) break; case XEN_SYSCTL_TBUFOP_enable: /* Enable trace buffers. Check buffers are already allocated. */ - if ( opt_tbuf_size == 0 ) + if ( opt_tbuf_size == 0 ) rc = -EINVAL; else tb_init_done = 1; @@ -438,7 +434,7 @@ int tb_control(struct xen_sysctl_tbuf_op *tbc) return rc; } -static inline unsigned int calc_rec_size(bool_t cycles, unsigned int extra) +static inline unsigned int calc_rec_size(bool_t cycles, unsigned int extra) { unsigned int rec_size = 4; @@ -597,7 +593,7 @@ static inline void __insert_record(struct t_buf *buf, rec->u.cycles.cycles_lo = (uint32_t)tsc; rec->u.cycles.cycles_hi = (uint32_t)(tsc >> 32); dst = rec->u.cycles.extra_u32; - } + } if ( extra_data && extra ) memcpy(dst, extra_data, extra); @@ -717,9 +713,6 @@ void __trace_var(u32 event, bool_t cycles, unsigned int extra, if ( !cpumask_test_cpu(smp_processor_id(), &tb_cpu_mask) ) return; - /* Read tb_init_done /before/ t_bufs. */ - smp_rmb(); - spin_lock_irqsave(&this_cpu(t_lock), flags); buf = this_cpu(t_bufs); @@ -735,14 +728,14 @@ void __trace_var(u32 event, bool_t cycles, unsigned int extra, /* Calculate the record size */ rec_size = calc_rec_size(cycles, extra); - + /* How many bytes are available in the buffer? */ bytes_to_tail = calc_bytes_avail(buf); - + /* How many bytes until the next wrap-around? */ bytes_to_wrap = calc_bytes_to_wrap(buf); - - /* + + /* * Calculate expected total size to commit this record by * doing a dry-run. */ @@ -756,7 +749,7 @@ void __trace_var(u32 event, bool_t cycles, unsigned int extra, { total_size += bytes_to_wrap; bytes_to_wrap = data_size; - } + } total_size += LOST_REC_SIZE; bytes_to_wrap -= LOST_REC_SIZE; @@ -768,7 +761,7 @@ void __trace_var(u32 event, bool_t cycles, unsigned int extra, if ( rec_size > bytes_to_wrap ) { total_size += bytes_to_wrap; - } + } total_size += rec_size; /* Do we have enough space for everything? */ @@ -781,7 +774,7 @@ void __trace_var(u32 event, bool_t cycles, unsigned int extra, } /* - * Now, actually write information + * Now, actually write information */ bytes_to_wrap = calc_bytes_to_wrap(buf); @@ -791,7 +784,7 @@ void __trace_var(u32 event, bool_t cycles, unsigned int extra, { insert_wrap_record(buf, LOST_REC_SIZE); bytes_to_wrap = data_size; - } + } insert_lost_records(buf); bytes_to_wrap -= LOST_REC_SIZE; diff --git a/xen/include/asm-x86/hvm/trace.h b/xen/include/asm-x86/hvm/trace.h index 2bbac45044ce..fbf834d10aff 100644 --- a/xen/include/asm-x86/hvm/trace.h +++ b/xen/include/asm-x86/hvm/trace.h @@ -52,7 +52,7 @@ #define DO_TRC_HVM_CLTS DEFAULT_HVM_MISC #define DO_TRC_HVM_LMSW DEFAULT_HVM_MISC #define DO_TRC_HVM_LMSW64 DEFAULT_HVM_MISC -#define DO_TRC_HVM_REALMODE_EMULATE DEFAULT_HVM_MISC +#define DO_TRC_HVM_REALMODE_EMULATE DEFAULT_HVM_MISC #define DO_TRC_HVM_TRAP DEFAULT_HVM_MISC #define DO_TRC_HVM_TRAP_DEBUG DEFAULT_HVM_MISC #define DO_TRC_HVM_VLAPIC DEFAULT_HVM_MISC -- 2.11.0