linux-kernel - Re: [PATCH 01/23] perf dwarf-aux: Remove unused pc argument

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Message-ID: <ZfmWgbkApCMoeWHm@x1>
Date: Tue, 19 Mar 2024 10:43:29 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephane Eranian <eranian@...gle.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	linux-toolchains@...r.kernel.org, linux-trace-devel@...r.kernel.org
Subject: Re: [PATCH 01/23] perf dwarf-aux: Remove unused pc argument

On Mon, Mar 18, 2024 at 10:50:53PM -0700, Namhyung Kim wrote:
> It's not used, let's get rid of it.

I looked for data->pc, there is usage somewhere else, but not via
__die_find_var_addr_cb() nor match_var_offset().

I think renaming:

  struct find_var_data data;

to:

  struct find_var_data var;

And:

  struct find_scope_data data;

to:

  struct find_scope_data scope;

Helps with grepping for 'data->pc', but that can be left for later.

Reviewed-by: Arnaldo Carvalho de Melo <acme@...hat.com>

- Arnaldo
 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/annotate-data.c | 4 ++--
>  tools/perf/util/dwarf-aux.c     | 7 ++-----
>  tools/perf/util/dwarf-aux.h     | 6 ++----
>  3 files changed, 6 insertions(+), 11 deletions(-)
> 
> diff --git a/tools/perf/util/annotate-data.c b/tools/perf/util/annotate-data.c
> index 30c4d19fcf11..59ce5f4f4a40 100644
> --- a/tools/perf/util/annotate-data.c
> +++ b/tools/perf/util/annotate-data.c
> @@ -263,7 +263,7 @@ static int find_data_type_die(struct debuginfo *di, u64 pc, u64 addr,
>  	offset = loc->offset;
>  
>  	if (reg == DWARF_REG_PC) {
> -		if (die_find_variable_by_addr(&cu_die, pc, addr, &var_die, &offset)) {
> +		if (die_find_variable_by_addr(&cu_die, addr, &var_die, &offset)) {
>  			ret = check_variable(&var_die, type_die, offset,
>  					     /*is_pointer=*/false);
>  			loc->offset = offset;
> @@ -312,7 +312,7 @@ static int find_data_type_die(struct debuginfo *di, u64 pc, u64 addr,
>  	/* Search from the inner-most scope to the outer */
>  	for (i = nr_scopes - 1; i >= 0; i--) {
>  		if (reg == DWARF_REG_PC) {
> -			if (!die_find_variable_by_addr(&scopes[i], pc, addr,
> +			if (!die_find_variable_by_addr(&scopes[i], addr,
>  						       &var_die, &offset))
>  				continue;
>  		} else {
> diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
> index 2791126069b4..e84d0d6a7750 100644
> --- a/tools/perf/util/dwarf-aux.c
> +++ b/tools/perf/util/dwarf-aux.c
> @@ -1456,7 +1456,6 @@ static int __die_find_var_addr_cb(Dwarf_Die *die_mem, void *arg)
>  /**
>   * die_find_variable_by_addr - Find variable located at given address
>   * @sc_die: a scope DIE
> - * @pc: the program address to find
>   * @addr: the data address to find
>   * @die_mem: a buffer to save the resulting DIE
>   * @offset: the offset in the resulting type
> @@ -1464,12 +1463,10 @@ static int __die_find_var_addr_cb(Dwarf_Die *die_mem, void *arg)
>   * Find the variable DIE located at the given address (in PC-relative mode).
>   * This is usually for global variables.
>   */
> -Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die, Dwarf_Addr pc,
> -				     Dwarf_Addr addr, Dwarf_Die *die_mem,
> -				     int *offset)
> +Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die, Dwarf_Addr addr,
> +				     Dwarf_Die *die_mem, int *offset)
>  {
>  	struct find_var_data data = {
> -		.pc = pc,
>  		.addr = addr,
>  	};
>  	Dwarf_Die *result;
> diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h
> index 85dd527ae1f7..9973801a20c1 100644
> --- a/tools/perf/util/dwarf-aux.h
> +++ b/tools/perf/util/dwarf-aux.h
> @@ -146,9 +146,8 @@ Dwarf_Die *die_find_variable_by_reg(Dwarf_Die *sc_die, Dwarf_Addr pc, int reg,
>  				    Dwarf_Die *die_mem);
>  
>  /* Find a (global) variable located in the 'addr' */
> -Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die, Dwarf_Addr pc,
> -				     Dwarf_Addr addr, Dwarf_Die *die_mem,
> -				     int *offset);
> +Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die, Dwarf_Addr addr,
> +				     Dwarf_Die *die_mem, int *offset);
>  
>  #else /*  HAVE_DWARF_GETLOCATIONS_SUPPORT */
>  
> @@ -170,7 +169,6 @@ static inline Dwarf_Die *die_find_variable_by_reg(Dwarf_Die *sc_die __maybe_unus
>  }
>  
>  static inline Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die __maybe_unused,
> -						   Dwarf_Addr pc __maybe_unused,
>  						   Dwarf_Addr addr __maybe_unused,
>  						   Dwarf_Die *die_mem __maybe_unused,
>  						   int *offset __maybe_unused)
> -- 
> 2.44.0.291.gc1ea87d7ee-goog
>