From nobody Wed Nov 27 14:31:11 2024 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E80CE1B86E4; Thu, 10 Oct 2024 07:02:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728543724; cv=none; b=fCOeNmTeGigJ32HTI+GgCfcSmskz6dzn78qiOss6UStJ+XoAZHRqKCJRshfBeWhLuK47oCmEzkI5Vbx6jwMpmzeoaG+Xz3tmEGMaia4GmRBRyxVadhYGf0r1EAKioEmM1N7kLEmVjdQ7NewcR96JXAlE3Ny4/SFYYDQnbDI+xEQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728543724; c=relaxed/simple; bh=VBaW+/YvBX8BFv0BvuAYwZnGx2U3ax0iqj0xx1funhA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=VqxlG5QL6zd0FCTAy3vMpZfr5Fi51Tbphmtv5tXh/fzuWLqLWPS4EMxSPgSmHS949JjCReGK05N5yRcssysPCzeRIKdvPGwzVfbiyJJCuFU9PDm59FCEC96VTqoWD9BAs6IdWcWjb7E4lWoENarkGJrTKMWGKEm7nPET/oc/UOE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=e32aOafG; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=6gwIvm56; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="e32aOafG"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="6gwIvm56" From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1728543720; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5QoykicB/pAh/WSOb4eQdzQd/jzD7GA4wfDL7Av/TrM=; b=e32aOafGUV3qPSxsHc4MOlWHOoSRuy5MHPaiiwdxyEOSqgalKHpV/FLREKAfQCD77ciEcs Z+KA3qGl6+HcWMbQ75CkMzw8UbcBNfSIM6dwEBLdT4bROdXcYWdDhXvNyNGfSY/zRZdXWj IiProyjwiEn3puxTn2AWPvedH7UixukhMQZ4cWltOozutek2oCr9fVZj3xOILlVqeOXDAs E3gXbcYVSkWe00jC37UHlOkVl0sJ6j7acVEmMbaA9qkR21EAeN13Le7bdqnH5j6LOZQAR7 v4frwzYEWuYMAgNJI2pUrRGFctvbZf5ag4iiP4FugdrwjlSE4fscFvmN1yvIdg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1728543720; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5QoykicB/pAh/WSOb4eQdzQd/jzD7GA4wfDL7Av/TrM=; b=6gwIvm56W4mNkn7pBVAqXHfHG8aDH4nd00hqpNp+F1fYGlS9aSGOpC93tvM+BvqDr+cCy8 vhgScBZxsp5KEmCw== Date: Thu, 10 Oct 2024 09:01:03 +0200 Subject: [PATCH 01/28] csky/vdso: Remove gettimeofday() and friends from VDSO Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241010-vdso-generic-base-v1-1-b64f0842d512@linutronix.de> References: <20241010-vdso-generic-base-v1-0-b64f0842d512@linutronix.de> In-Reply-To: <20241010-vdso-generic-base-v1-0-b64f0842d512@linutronix.de> To: Guo Ren , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Catalin Marinas , Will Deacon , Paul Walmsley , Palmer Dabbelt , Albert Ou , Russell King , Huacai Chen , WANG Xuerui , Theodore Ts'o , "Jason A. Donenfeld" , Thomas Bogendoerfer , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Madhavan Srinivasan , Vincenzo Frascino Cc: Christophe Leroy , linux-csky@vger.kernel.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Developer-Signature: v=1; a=ed25519-sha256; t=1728543717; l=11287; i=thomas.weissschuh@linutronix.de; s=20240209; h=from:subject:message-id; bh=VBaW+/YvBX8BFv0BvuAYwZnGx2U3ax0iqj0xx1funhA=; b=QubHXxNzWnFKJVh0Vbyda7ltPGIY+C0zBzJ5tqLCuCQGnBgIgvER4juNzOrKeY/sU6Z+NDqA+ oohYqkPWX5oCv+MC7Y4LsGo5ore38WDrbqgQmjkVDa+Qw9AiWsDSUYl X-Developer-Key: i=thomas.weissschuh@linutronix.de; a=ed25519; pk=pfvxvpFUDJV2h2nY0FidLUml22uGLSjByFbM6aqQQws= The time-related VDSO functionality was introduced in 2021 in commit 87f3248cdb9a ("csky: Reconstruct VDSO framework") and commit 0d3b051adbb7 ("csky: Add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIM= E_VSYSCALL, HAVE_GENERIC_VDSO"). However the corresponding aux-vector entry AT_SYSINFO_EHDR was never wired up, making these functions impossible to test or use. The VDSO itself is kept as it also provides rt_sigreturn which is exposed differently to userspace. Signed-off-by: Thomas Wei=C3=9Fschuh --- arch/csky/Kconfig | 4 -- arch/csky/include/asm/vdso/clocksource.h | 9 --- arch/csky/include/asm/vdso/gettimeofday.h | 114 --------------------------= ---- arch/csky/include/asm/vdso/processor.h | 12 ---- arch/csky/include/asm/vdso/vsyscall.h | 22 ------ arch/csky/kernel/vdso.c | 24 +------ arch/csky/kernel/vdso/Makefile | 1 - arch/csky/kernel/vdso/vdso.lds.S | 4 -- arch/csky/kernel/vdso/vgettimeofday.c | 30 -------- 9 files changed, 2 insertions(+), 218 deletions(-) diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig index 5479707eb5d10df1e083c9c7c547c266b64f4232..acc431c331b08eca0c853e96ead= 44478d99257dd 100644 --- a/arch/csky/Kconfig +++ b/arch/csky/Kconfig @@ -64,9 +64,6 @@ config CSKY select GENERIC_IRQ_MULTI_HANDLER select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD - select GENERIC_TIME_VSYSCALL - select GENERIC_VDSO_32 - select GENERIC_GETTIMEOFDAY select GX6605S_TIMER if CPU_CK610 select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_AUDITSYSCALL @@ -80,7 +77,6 @@ config CSKY select HAVE_DEBUG_KMEMLEAK select HAVE_DYNAMIC_FTRACE select HAVE_DYNAMIC_FTRACE_WITH_REGS - select HAVE_GENERIC_VDSO select HAVE_FUNCTION_TRACER select HAVE_FUNCTION_GRAPH_TRACER select HAVE_FUNCTION_ERROR_INJECTION diff --git a/arch/csky/include/asm/vdso/clocksource.h b/arch/csky/include/a= sm/vdso/clocksource.h deleted file mode 100644 index dfca7b4724b798ea0e0f05ea7559a4570f8fa5f7..000000000000000000000000000= 0000000000000 --- a/arch/csky/include/asm/vdso/clocksource.h +++ /dev/null @@ -1,9 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ - -#ifndef __ASM_VDSO_CSKY_CLOCKSOURCE_H -#define __ASM_VDSO_CSKY_CLOCKSOURCE_H - -#define VDSO_ARCH_CLOCKMODES \ - VDSO_CLOCKMODE_ARCHTIMER - -#endif /* __ASM_VDSO_CSKY_CLOCKSOURCE_H */ diff --git a/arch/csky/include/asm/vdso/gettimeofday.h b/arch/csky/include/= asm/vdso/gettimeofday.h deleted file mode 100644 index 6c4f1446944f94dc3f02a193260998231edea566..000000000000000000000000000= 0000000000000 --- a/arch/csky/include/asm/vdso/gettimeofday.h +++ /dev/null @@ -1,114 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ - -#ifndef __ASM_VDSO_CSKY_GETTIMEOFDAY_H -#define __ASM_VDSO_CSKY_GETTIMEOFDAY_H - -#ifndef __ASSEMBLY__ - -#include -#include -#include -#include - -#define VDSO_HAS_CLOCK_GETRES 1 - -static __always_inline -int gettimeofday_fallback(struct __kernel_old_timeval *_tv, - struct timezone *_tz) -{ - register struct __kernel_old_timeval *tv asm("a0") =3D _tv; - register struct timezone *tz asm("a1") =3D _tz; - register long ret asm("a0"); - register long nr asm(syscallid) =3D __NR_gettimeofday; - - asm volatile ("trap 0\n" - : "=3Dr" (ret) - : "r"(tv), "r"(tz), "r"(nr) - : "memory"); - - return ret; -} - -static __always_inline -long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_t= s) -{ - register clockid_t clkid asm("a0") =3D _clkid; - register struct __kernel_timespec *ts asm("a1") =3D _ts; - register long ret asm("a0"); - register long nr asm(syscallid) =3D __NR_clock_gettime64; - - asm volatile ("trap 0\n" - : "=3Dr" (ret) - : "r"(clkid), "r"(ts), "r"(nr) - : "memory"); - - return ret; -} - -static __always_inline -long clock_gettime32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) -{ - register clockid_t clkid asm("a0") =3D _clkid; - register struct old_timespec32 *ts asm("a1") =3D _ts; - register long ret asm("a0"); - register long nr asm(syscallid) =3D __NR_clock_gettime; - - asm volatile ("trap 0\n" - : "=3Dr" (ret) - : "r"(clkid), "r"(ts), "r"(nr) - : "memory"); - - return ret; -} - -static __always_inline -int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) -{ - register clockid_t clkid asm("a0") =3D _clkid; - register struct __kernel_timespec *ts asm("a1") =3D _ts; - register long ret asm("a0"); - register long nr asm(syscallid) =3D __NR_clock_getres_time64; - - asm volatile ("trap 0\n" - : "=3Dr" (ret) - : "r"(clkid), "r"(ts), "r"(nr) - : "memory"); - - return ret; -} - -static __always_inline -int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) -{ - register clockid_t clkid asm("a0") =3D _clkid; - register struct old_timespec32 *ts asm("a1") =3D _ts; - register long ret asm("a0"); - register long nr asm(syscallid) =3D __NR_clock_getres; - - asm volatile ("trap 0\n" - : "=3Dr" (ret) - : "r"(clkid), "r"(ts), "r"(nr) - : "memory"); - - return ret; -} - -uint64_t csky_pmu_read_cc(void); -static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, - const struct vdso_data *vd) -{ -#ifdef CONFIG_CSKY_PMU_V1 - return csky_pmu_read_cc(); -#else - return 0; -#endif -} - -static __always_inline const struct vdso_data *__arch_get_vdso_data(void) -{ - return _vdso_data; -} - -#endif /* !__ASSEMBLY__ */ - -#endif /* __ASM_VDSO_CSKY_GETTIMEOFDAY_H */ diff --git a/arch/csky/include/asm/vdso/processor.h b/arch/csky/include/asm= /vdso/processor.h deleted file mode 100644 index 39a6b561d0cc846cfb39a962c17e46104ae04807..000000000000000000000000000= 0000000000000 --- a/arch/csky/include/asm/vdso/processor.h +++ /dev/null @@ -1,12 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-only */ - -#ifndef __ASM_VDSO_CSKY_PROCESSOR_H -#define __ASM_VDSO_CSKY_PROCESSOR_H - -#ifndef __ASSEMBLY__ - -#define cpu_relax() barrier() - -#endif /* __ASSEMBLY__ */ - -#endif /* __ASM_VDSO_CSKY_PROCESSOR_H */ diff --git a/arch/csky/include/asm/vdso/vsyscall.h b/arch/csky/include/asm/= vdso/vsyscall.h deleted file mode 100644 index c276211a7c4d56c48c0330e309c6e5a5c5c09dc9..000000000000000000000000000= 0000000000000 --- a/arch/csky/include/asm/vdso/vsyscall.h +++ /dev/null @@ -1,22 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ - -#ifndef __ASM_VDSO_CSKY_VSYSCALL_H -#define __ASM_VDSO_CSKY_VSYSCALL_H - -#ifndef __ASSEMBLY__ - -#include - -extern struct vdso_data *vdso_data; - -static __always_inline struct vdso_data *__csky_get_k_vdso_data(void) -{ - return vdso_data; -} -#define __arch_get_k_vdso_data __csky_get_k_vdso_data - -#include - -#endif /* !__ASSEMBLY__ */ - -#endif /* __ASM_VDSO_CSKY_VSYSCALL_H */ diff --git a/arch/csky/kernel/vdso.c b/arch/csky/kernel/vdso.c index 5c9ef63c29f1d92570dbeba1249f04c267c5ff49..92ab8ac6a5960e30b660530ae9b= 10137d5872369 100644 --- a/arch/csky/kernel/vdso.c +++ b/arch/csky/kernel/vdso.c @@ -8,23 +8,19 @@ #include =20 #include -#include =20 extern char vdso_start[], vdso_end[]; =20 static unsigned int vdso_pages; static struct page **vdso_pagelist; =20 -static union vdso_data_store vdso_data_store __page_aligned_data; -struct vdso_data *vdso_data =3D vdso_data_store.data; - static int __init vdso_init(void) { unsigned int i; =20 vdso_pages =3D (vdso_end - vdso_start) >> PAGE_SHIFT; vdso_pagelist =3D - kcalloc(vdso_pages + 1, sizeof(struct page *), GFP_KERNEL); + kcalloc(vdso_pages, sizeof(struct page *), GFP_KERNEL); if (unlikely(vdso_pagelist =3D=3D NULL)) { pr_err("vdso: pagelist allocation failed\n"); return -ENOMEM; @@ -36,7 +32,6 @@ static int __init vdso_init(void) pg =3D virt_to_page(vdso_start + (i << PAGE_SHIFT)); vdso_pagelist[i] =3D pg; } - vdso_pagelist[i] =3D virt_to_page(vdso_data); =20 return 0; } @@ -52,11 +47,8 @@ int arch_setup_additional_pages(struct linux_binprm *bpr= m, static struct vm_special_mapping vdso_mapping =3D { .name =3D "[vdso]", }; - static struct vm_special_mapping vvar_mapping =3D { - .name =3D "[vvar]", - }; =20 - vdso_len =3D (vdso_pages + 1) << PAGE_SHIFT; + vdso_len =3D vdso_pages << PAGE_SHIFT; =20 mmap_write_lock(mm); vdso_base =3D get_unmapped_area(NULL, 0, vdso_len, 0, 0); @@ -85,15 +77,6 @@ int arch_setup_additional_pages(struct linux_binprm *bpr= m, } =20 vdso_base +=3D (vdso_pages << PAGE_SHIFT); - vvar_mapping.pages =3D &vdso_pagelist[vdso_pages]; - vma =3D _install_special_mapping(mm, vdso_base, PAGE_SIZE, - (VM_READ | VM_MAYREAD), &vvar_mapping); - - if (IS_ERR(vma)) { - ret =3D PTR_ERR(vma); - mm->context.vdso =3D NULL; - goto end; - } ret =3D 0; end: mmap_write_unlock(mm); @@ -104,8 +87,5 @@ const char *arch_vma_name(struct vm_area_struct *vma) { if (vma->vm_mm && (vma->vm_start =3D=3D (long)vma->vm_mm->context.vdso)) return "[vdso]"; - if (vma->vm_mm && (vma->vm_start =3D=3D - (long)vma->vm_mm->context.vdso + PAGE_SIZE)) - return "[vdso_data]"; return NULL; } diff --git a/arch/csky/kernel/vdso/Makefile b/arch/csky/kernel/vdso/Makefile index bc2261f5a8d4393d96c6b459730b0e37ce20ad4e..069ef0b17fe5235918a6aa13aa1= 20857bbbf3faf 100644 --- a/arch/csky/kernel/vdso/Makefile +++ b/arch/csky/kernel/vdso/Makefile @@ -5,7 +5,6 @@ include $(srctree)/lib/vdso/Makefile =20 # Symbols present in the vdso vdso-syms +=3D rt_sigreturn -vdso-syms +=3D vgettimeofday =20 # Files to link into the vdso obj-vdso =3D $(patsubst %, %.o, $(vdso-syms)) note.o diff --git a/arch/csky/kernel/vdso/vdso.lds.S b/arch/csky/kernel/vdso/vdso.= lds.S index 590a6c79fff7d78dc22be83cc9fec113a2ff3bd5..8d226252d4394e4e2aed1cb7444= b329c75eca386 100644 --- a/arch/csky/kernel/vdso/vdso.lds.S +++ b/arch/csky/kernel/vdso/vdso.lds.S @@ -49,10 +49,6 @@ VERSION LINUX_5.10 { global: __vdso_rt_sigreturn; - __vdso_clock_gettime; - __vdso_clock_gettime64; - __vdso_gettimeofday; - __vdso_clock_getres; local: *; }; } diff --git a/arch/csky/kernel/vdso/vgettimeofday.c b/arch/csky/kernel/vdso/= vgettimeofday.c deleted file mode 100644 index 55af30e8375288a52ac96d938feb496adc9cd7c6..000000000000000000000000000= 0000000000000 --- a/arch/csky/kernel/vdso/vgettimeofday.c +++ /dev/null @@ -1,30 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only - -#include -#include -#include - -extern -int __vdso_clock_gettime(clockid_t clock, - struct old_timespec32 *ts) -{ - return __cvdso_clock_gettime32(clock, ts); -} - -int __vdso_clock_gettime64(clockid_t clock, - struct __kernel_timespec *ts) -{ - return __cvdso_clock_gettime(clock, ts); -} - -int __vdso_gettimeofday(struct __kernel_old_timeval *tv, - struct timezone *tz) -{ - return __cvdso_gettimeofday(tv, tz); -} - -int __vdso_clock_getres(clockid_t clock_id, - struct old_timespec32 *res) -{ - return __cvdso_clock_getres_time32(clock_id, res); -} --=20 2.47.0