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entry: Add syscall_exit_to_user_mode_work()

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This is the same as syscall_exit_to_user_mode() but without calling
exit_to_user_mode(). This can be used if there is an architectural reason
to avoid the combo function, e.g. restarting a syscall without returning to
userspace. Before returning to user space the caller has to invoke
exit_to_user_mode().

[ tglx: Amended comments ]

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201201142755.31931-6-svens@linux.ibm.com
This commit is contained in:
Sven Schnelle
2020-12-01 15:27:55 +01:00
committed by Thomas Gleixner
parent 310de1a678
commit c6156e1da6
2 changed files with 32 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/entry/common.c
+12 -2
View File
@@ -282,12 +282,22 @@ static void syscall_exit_to_user_mode_prepare(struct pt_regs *regs)
syscall_exit_work(regs, work);
}
__visible noinstr void syscall_exit_to_user_mode(struct pt_regs *regs)
static __always_inline void __syscall_exit_to_user_mode_work(struct pt_regs *regs)
{
instrumentation_begin();
syscall_exit_to_user_mode_prepare(regs);
local_irq_disable_exit_to_user();
exit_to_user_mode_prepare(regs);
}
void syscall_exit_to_user_mode_work(struct pt_regs *regs)
{
__syscall_exit_to_user_mode_work(regs);
}
__visible noinstr void syscall_exit_to_user_mode(struct pt_regs *regs)
{
instrumentation_begin();
__syscall_exit_to_user_mode_work(regs);
instrumentation_end();
__exit_to_user_mode();
}