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Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Andy Lutomirski , Peter Zijlstra , Frederic Weisbecker , "Paul E. McKenney" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Andrew Morton , Uladzislau Rezki , Christoph Hellwig , Lorenzo Stoakes , Jason Baron , Kees Cook , Sami Tolvanen , Ard Biesheuvel , Nicholas Piggin , Juerg Haefliger , Nicolas Saenz Julienne , "Kirill A. Shutemov" , Nadav Amit , Dan Carpenter , Chuang Wang , Yang Jihong , Petr Mladek , "Jason A. Donenfeld" , Song Liu , Julian Pidancet , Tom Lendacky , Dionna Glaze , Thomas =?utf-8?Q?Wei=C3=9Fschuh?= , Juri Lelli , Daniel Bristot de Oliveira , Marcelo Tosatti , Yair Podemsky Subject: Re: [RFC PATCH v2 12/20] objtool: Warn about non __ro_after_init static key usage in .noinstr In-Reply-To: <20230728153557.frzmaayyy3auibx3@treble> References: <20230720163056.2564824-1-vschneid@redhat.com> <20230720163056.2564824-13-vschneid@redhat.com> <20230728153557.frzmaayyy3auibx3@treble> Date: Mon, 31 Jul 2023 12:18:40 +0100 Message-ID: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org On 28/07/23 10:35, Josh Poimboeuf wrote: > On Thu, Jul 20, 2023 at 05:30:48PM +0100, Valentin Schneider wrote: >> +static int validate_static_key(struct instruction *insn, struct insn_state *state) >> +{ >> + if (state->noinstr && state->instr <= 0) { >> + if ((strcmp(insn->key_sym->sec->name, ".data..ro_after_init"))) { >> + WARN_INSN(insn, >> + "Non __ro_after_init static key \"%s\" in .noinstr section", > > For consistency with other warnings, this should start with a lowercase > "n" and the string literal should be on the same line as the WARN_INSN, > like > > WARN_INSN(insn, "non __ro_after_init static key \"%s\" in .noinstr section", > ... > >> diff --git a/tools/objtool/special.c b/tools/objtool/special.c >> index 91b1950f5bd8a..1f76cfd815bf3 100644 >> --- a/tools/objtool/special.c >> +++ b/tools/objtool/special.c >> @@ -127,6 +127,9 @@ static int get_alt_entry(struct elf *elf, const struct special_entry *entry, >> return -1; >> } >> alt->key_addend = reloc_addend(key_reloc); >> + >> + reloc_to_sec_off(key_reloc, &sec, &offset); >> + alt->key_sym = find_symbol_by_offset(sec, offset & ~2); > > Bits 0 and 1 can both store data, should be ~3? > Quite so, that needs to be the same as jump_entry_key(). > -- > Josh