From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnaldo Carvalho de Melo Subject: [PATCH 33/35] kallsyms: Simplify update_iter_mod() Date: Wed, 15 Aug 2018 12:06:09 -0300 Message-ID: <20180815150611.32080-34-acme@kernel.org> References: <20180815150611.32080-1-acme@kernel.org> Return-path: In-Reply-To: <20180815150611.32080-1-acme@kernel.org> Sender: linux-kernel-owner@vger.kernel.org To: Ingo Molnar Cc: Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Adrian Hunter , Alexander Shishkin , Andy Lutomirski , Dave Hansen , "H . Peter Anvin" , Jiri Olsa , Joerg Roedel , Thomas Gleixner , x86@kernel.org, Arnaldo Carvalho de Melo List-Id: linux-perf-users.vger.kernel.org From: Adrian Hunter The logic in update_iter_mod() is overcomplicated and gets worse every time another get_ksymbol_* function is added. In preparation for adding another get_ksymbol_* function, simplify logic in update_iter_mod(). Signed-off-by: Adrian Hunter Tested-by: (ftrace changes only) Steven Rostedt (VMware) Acked-by: Andi Kleen Acked-by: Peter Zijlstra (Intel) Cc: Alexander Shishkin Cc: Andy Lutomirski Cc: Dave Hansen Cc: H. Peter Anvin Cc: Jiri Olsa Cc: Joerg Roedel Cc: Thomas Gleixner Cc: x86@kernel.org Link: http://lkml.kernel.org/r/1528289651-4113-2-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- kernel/kallsyms.c | 25 +++++++++++-------------- 1 file changed, 11 insertions(+), 14 deletions(-) diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c index a23e21ada81b..aa31aa07f2ef 100644 --- a/kernel/kallsyms.c +++ b/kernel/kallsyms.c @@ -506,27 +506,24 @@ static void reset_iter(struct kallsym_iter *iter, loff_t new_pos) } } +/* + * The end position (last + 1) of each additional kallsyms section is recorded + * in iter->pos_..._end as each section is added, and so can be used to + * determine which get_ksymbol_...() function to call next. + */ static int update_iter_mod(struct kallsym_iter *iter, loff_t pos) { iter->pos = pos; - if (iter->pos_ftrace_mod_end > 0 && - iter->pos_ftrace_mod_end < iter->pos) - return get_ksymbol_bpf(iter); - - if (iter->pos_mod_end > 0 && - iter->pos_mod_end < iter->pos) { - if (!get_ksymbol_ftrace_mod(iter)) - return get_ksymbol_bpf(iter); + if ((!iter->pos_mod_end || iter->pos_mod_end > pos) && + get_ksymbol_mod(iter)) return 1; - } - if (!get_ksymbol_mod(iter)) { - if (!get_ksymbol_ftrace_mod(iter)) - return get_ksymbol_bpf(iter); - } + if ((!iter->pos_ftrace_mod_end || iter->pos_ftrace_mod_end > pos) && + get_ksymbol_ftrace_mod(iter)) + return 1; - return 1; + return get_ksymbol_bpf(iter); } /* Returns false if pos at or past end of file. */ -- 2.14.4