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entry: Rename arch_check_user_regs() to arch_enter_from_user_mode()

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arch_check_user_regs() is used at the moment to verify that struct pt_regs
contains valid values when entering the kernel from userspace. s390 needs
a place in the generic entry code to modify a cpu data structure when
switching from userspace to kernel mode. As arch_check_user_regs() is
exactly this, rename it to arch_enter_from_user_mode().

When entering the kernel from userspace, arch_check_user_regs() is
used to verify that struct pt_regs contains valid values. Note that
the NMI codepath doesn't call this function. s390 needs a place in the
generic entry code to modify a cpu data structure when switching from
userspace to kernel mode. As arch_check_user_regs() is exactly this,
rename it to arch_enter_from_user_mode().

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20220504062351.2954280-2-tmricht@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2022-05-04 08:23:50 +02:00 committed by Heiko Carstens
parent fcdc03f78d
commit 6d97af487d
4 changed files with 9 additions and 9 deletions
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4
arch/s390/include/asm/entry-common.h
View file

@ -15,12 +15,12 @@
void do_per_trap(struct pt_regs *regs);
#ifdef CONFIG_DEBUG_ENTRY
static __always_inline void arch_check_user_regs(struct pt_regs *regs)
static __always_inline void arch_enter_from_user_mode(struct pt_regs *regs)
{
debug_user_asce(0);
}
#define arch_check_user_regs arch_check_user_regs
#define arch_enter_from_user_mode arch_enter_from_user_mode
#endif /* CONFIG_DEBUG_ENTRY */
static __always_inline void arch_exit_to_user_mode_work(struct pt_regs *regs,

4
arch/x86/include/asm/entry-common.h
View file

@ -10,7 +10,7 @@
#include <asm/fpu/api.h>
/* Check that the stack and regs on entry from user mode are sane. */
static __always_inline void arch_check_user_regs(struct pt_regs *regs)
static __always_inline void arch_enter_from_user_mode(struct pt_regs *regs)
{
if (IS_ENABLED(CONFIG_DEBUG_ENTRY)) {
/*
@ -42,7 +42,7 @@ static __always_inline void arch_check_user_regs(struct pt_regs *regs)
WARN_ON_ONCE(regs != task_pt_regs(current));
}
}
#define arch_check_user_regs arch_check_user_regs
#define arch_enter_from_user_mode arch_enter_from_user_mode
static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs,
unsigned long ti_work)

8
include/linux/entry-common.h
View file

@ -63,7 +63,7 @@
ARCH_EXIT_TO_USER_MODE_WORK)
/**
* arch_check_user_regs - Architecture specific sanity check for user mode regs
* arch_enter_from_user_mode - Architecture specific sanity check for user mode regs
* @regs: Pointer to currents pt_regs
*
* Defaults to an empty implementation. Can be replaced by architecture
@ -73,10 +73,10 @@
* section. Use __always_inline so the compiler cannot push it out of line
* and make it instrumentable.
*/
static __always_inline void arch_check_user_regs(struct pt_regs *regs);
static __always_inline void arch_enter_from_user_mode(struct pt_regs *regs);
#ifndef arch_check_user_regs
static __always_inline void arch_check_user_regs(struct pt_regs *regs) {}
#ifndef arch_enter_from_user_mode
static __always_inline void arch_enter_from_user_mode(struct pt_regs *regs) {}
#endif
/**

2
kernel/entry/common.c
View file

@ -17,7 +17,7 @@
/* See comment for enter_from_user_mode() in entry-common.h */
static __always_inline void __enter_from_user_mode(struct pt_regs *regs)
{
arch_check_user_regs(regs);
arch_enter_from_user_mode(regs);
lockdep_hardirqs_off(CALLER_ADDR0);
CT_WARN_ON(ct_state() != CONTEXT_USER);