The following commit has been merged into the timers/vdso branch of tip:

Commit-ID:     cf12469600fe50aa4ce720645fd31e97a5d2e87b
Gitweb:        https://git.kernel.org/tip/cf12469600fe50aa4ce720645fd31e97a5d2e87b
Author:        Thomas Weißschuh <thomas.weissschuh@linutronix.de>
AuthorDate:    Thu, 10 Oct 2024 09:01:03 +02:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Sat, 02 Nov 2024 12:37:32 +01:00

csky/vdso: Remove gettimeofday() and friends from VDSO

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_TIME_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 Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-1-b64f0842d512@linutronix.de

---
 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(-)
 delete mode 100644 arch/csky/include/asm/vdso/clocksource.h
 delete mode 100644 arch/csky/include/asm/vdso/gettimeofday.h
 delete mode 100644 arch/csky/include/asm/vdso/processor.h
 delete mode 100644 arch/csky/include/asm/vdso/vsyscall.h
 delete mode 100644 arch/csky/kernel/vdso/vgettimeofday.c

diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 5479707..acc431c 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/asm/vdso/clocksource.h
deleted file mode 100644
index dfca7b4..0000000
--- 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 6c4f144..0000000
--- 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 <asm/barrier.h>
-#include <asm/unistd.h>
-#include <abi/regdef.h>
-#include <uapi/linux/time.h>
-
-#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") = _tv;
-	register struct timezone *tz asm("a1") = _tz;
-	register long ret asm("a0");
-	register long nr asm(syscallid) = __NR_gettimeofday;
-
-	asm volatile ("trap 0\n"
-		      : "=r" (ret)
-		      : "r"(tv), "r"(tz), "r"(nr)
-		      : "memory");
-
-	return ret;
-}
-
-static __always_inline
-long clock_gettime_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
-{
-	register clockid_t clkid asm("a0") = _clkid;
-	register struct __kernel_timespec *ts asm("a1") = _ts;
-	register long ret asm("a0");
-	register long nr asm(syscallid) = __NR_clock_gettime64;
-
-	asm volatile ("trap 0\n"
-		      : "=r" (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") = _clkid;
-	register struct old_timespec32 *ts asm("a1") = _ts;
-	register long ret asm("a0");
-	register long nr asm(syscallid) = __NR_clock_gettime;
-
-	asm volatile ("trap 0\n"
-		      : "=r" (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") = _clkid;
-	register struct __kernel_timespec *ts asm("a1") = _ts;
-	register long ret asm("a0");
-	register long nr asm(syscallid) = __NR_clock_getres_time64;
-
-	asm volatile ("trap 0\n"
-		      : "=r" (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") = _clkid;
-	register struct old_timespec32 *ts asm("a1") = _ts;
-	register long ret asm("a0");
-	register long nr asm(syscallid) = __NR_clock_getres;
-
-	asm volatile ("trap 0\n"
-		      : "=r" (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 39a6b56..0000000
--- 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 c276211..0000000
--- 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 <vdso/datapage.h>
-
-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 <asm-generic/vdso/vsyscall.h>
-
-#endif /* !__ASSEMBLY__ */
-
-#endif /* __ASM_VDSO_CSKY_VSYSCALL_H */
diff --git a/arch/csky/kernel/vdso.c b/arch/csky/kernel/vdso.c
index 5c9ef63..92ab8ac 100644
--- a/arch/csky/kernel/vdso.c
+++ b/arch/csky/kernel/vdso.c
@@ -8,23 +8,19 @@
 #include <linux/slab.h>
 
 #include <asm/page.h>
-#include <vdso/datapage.h>
 
 extern char vdso_start[], vdso_end[];
 
 static unsigned int vdso_pages;
 static struct page **vdso_pagelist;
 
-static union vdso_data_store vdso_data_store __page_aligned_data;
-struct vdso_data *vdso_data = vdso_data_store.data;
-
 static int __init vdso_init(void)
 {
 	unsigned int i;
 
 	vdso_pages = (vdso_end - vdso_start) >> PAGE_SHIFT;
 	vdso_pagelist =
-		kcalloc(vdso_pages + 1, sizeof(struct page *), GFP_KERNEL);
+		kcalloc(vdso_pages, sizeof(struct page *), GFP_KERNEL);
 	if (unlikely(vdso_pagelist == NULL)) {
 		pr_err("vdso: pagelist allocation failed\n");
 		return -ENOMEM;
@@ -36,7 +32,6 @@ static int __init vdso_init(void)
 		pg = virt_to_page(vdso_start + (i << PAGE_SHIFT));
 		vdso_pagelist[i] = pg;
 	}
-	vdso_pagelist[i] = virt_to_page(vdso_data);
 
 	return 0;
 }
@@ -52,11 +47,8 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
 	static struct vm_special_mapping vdso_mapping = {
 		.name = "[vdso]",
 	};
-	static struct vm_special_mapping vvar_mapping = {
-		.name = "[vvar]",
-	};
 
-	vdso_len = (vdso_pages + 1) << PAGE_SHIFT;
+	vdso_len = vdso_pages << PAGE_SHIFT;
 
 	mmap_write_lock(mm);
 	vdso_base = get_unmapped_area(NULL, 0, vdso_len, 0, 0);
@@ -85,15 +77,6 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
 	}
 
 	vdso_base += (vdso_pages << PAGE_SHIFT);
-	vvar_mapping.pages = &vdso_pagelist[vdso_pages];
-	vma = _install_special_mapping(mm, vdso_base, PAGE_SIZE,
-		(VM_READ | VM_MAYREAD), &vvar_mapping);
-
-	if (IS_ERR(vma)) {
-		ret = PTR_ERR(vma);
-		mm->context.vdso = NULL;
-		goto end;
-	}
 	ret = 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 == (long)vma->vm_mm->context.vdso))
 		return "[vdso]";
-	if (vma->vm_mm && (vma->vm_start ==
-			   (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 bc2261f..069ef0b 100644
--- a/arch/csky/kernel/vdso/Makefile
+++ b/arch/csky/kernel/vdso/Makefile
@@ -5,7 +5,6 @@ include $(srctree)/lib/vdso/Makefile
 
 # Symbols present in the vdso
 vdso-syms  += rt_sigreturn
-vdso-syms  += vgettimeofday
 
 # Files to link into the vdso
 obj-vdso = $(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 590a6c7..8d22625 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 55af30e..0000000
--- a/arch/csky/kernel/vdso/vgettimeofday.c
+++ /dev/null
@@ -1,30 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-
-#include <linux/time.h>
-#include <linux/types.h>
-#include <vdso/gettime.h>
-
-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);
-}