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Sat, 23 Mar 2024 10:14:58 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20240322165233.71698-1-brgerst@gmail.com> <20240322165233.71698-11-brgerst@gmail.com> In-Reply-To: <20240322165233.71698-11-brgerst@gmail.com> From: Uros Bizjak Date: Sat, 23 Mar 2024 18:14:56 +0100 Message-ID: Subject: Re: [PATCH v4 10/16] x86/percpu/64: Remove fixed_percpu_data To: Brian Gerst Cc: linux-kernel@vger.kernel.org, x86@kernel.org, Ingo Molnar , Thomas Gleixner , Borislav Petkov , "H . Peter Anvin" , David.Laight@aculab.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Mar 22, 2024 at 5:52=E2=80=AFPM Brian Gerst wro= te: > > Now that the stack protector canary value is a normal percpu variable, > fixed_percpu_data is unused and can be removed. > > Signed-off-by: Brian Gerst Reviewed-by: Uros Bizjak > --- > arch/x86/include/asm/processor.h | 8 -------- > arch/x86/kernel/cpu/common.c | 4 ---- > arch/x86/kernel/vmlinux.lds.S | 1 - > arch/x86/tools/relocs.c | 1 - > 4 files changed, 14 deletions(-) > > diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/proc= essor.h > index 40d6add8ff31..1f15a7bee876 100644 > --- a/arch/x86/include/asm/processor.h > +++ b/arch/x86/include/asm/processor.h > @@ -386,14 +386,6 @@ struct irq_stack { > } __aligned(IRQ_STACK_SIZE); > > #ifdef CONFIG_X86_64 > -struct fixed_percpu_data { > - char gs_base[40]; > - unsigned long reserved; > -}; > - > -DECLARE_PER_CPU_FIRST(struct fixed_percpu_data, fixed_percpu_data) __vis= ible; > -DECLARE_INIT_PER_CPU(fixed_percpu_data); > - > static inline unsigned long cpu_kernelmode_gs_base(int cpu) > { > #ifdef CONFIG_SMP > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c > index f49e8f5b858d..395a8831d507 100644 > --- a/arch/x86/kernel/cpu/common.c > +++ b/arch/x86/kernel/cpu/common.c > @@ -1997,10 +1997,6 @@ EXPORT_PER_CPU_SYMBOL(pcpu_hot); > EXPORT_PER_CPU_SYMBOL(const_pcpu_hot); > > #ifdef CONFIG_X86_64 > -DEFINE_PER_CPU_FIRST(struct fixed_percpu_data, > - fixed_percpu_data) __aligned(PAGE_SIZE) __visible; > -EXPORT_PER_CPU_SYMBOL_GPL(fixed_percpu_data); > - > static void wrmsrl_cstar(unsigned long val) > { > /* > diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.= S > index 0b152f96c24e..667202ebd37f 100644 > --- a/arch/x86/kernel/vmlinux.lds.S > +++ b/arch/x86/kernel/vmlinux.lds.S > @@ -473,7 +473,6 @@ SECTIONS > */ > #define INIT_PER_CPU(x) init_per_cpu__##x =3D ABSOLUTE(x) > INIT_PER_CPU(gdt_page); > -INIT_PER_CPU(fixed_percpu_data); > INIT_PER_CPU(irq_stack_backing_store); > > #ifdef CONFIG_MITIGATION_UNRET_ENTRY > diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c > index 016650ddaf7f..65e6f3d6d890 100644 > --- a/arch/x86/tools/relocs.c > +++ b/arch/x86/tools/relocs.c > @@ -834,7 +834,6 @@ static void percpu_init(void) > * __per_cpu_load > * > * The "gold" linker incorrectly associates: > - * init_per_cpu__fixed_percpu_data > * init_per_cpu__gdt_page > */ > static int is_percpu_sym(ElfW(Sym) *sym, const char *symname) > -- > 2.44.0 >