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riscv: entry: Convert ret_from_fork() to C

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Move the main section of ret_from_fork() to C to allow inlining of
syscall_exit_to_user_mode().

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/all/20250320-riscv_optimize_entry-v6-1-63e187e26041@rivosinc.com
This commit is contained in:
Charlie Jenkins
2025-03-20 10:29:21 -07:00
committed by Thomas Gleixner
parent b4432656b3
commit f955aa8723
3 changed files with 19 additions and 11 deletions
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14
arch/riscv/kernel/process.c
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@@ -17,7 +17,9 @@
#include <linux/ptrace.h>
#include <linux/uaccess.h>
#include <linux/personality.h>
#include <linux/entry-common.h>
#include <asm/asm-prototypes.h>
#include <asm/unistd.h>
#include <asm/processor.h>
#include <asm/csr.h>
@@ -36,7 +38,7 @@ unsigned long __stack_chk_guard __read_mostly;
EXPORT_SYMBOL(__stack_chk_guard);
#endif
extern asmlinkage void ret_from_fork(void);
extern asmlinkage void ret_from_fork_asm(void);
void noinstr arch_cpu_idle(void)
{
@@ -206,6 +208,14 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
return 0;
}
asmlinkage void ret_from_fork(void *fn_arg, int (*fn)(void *), struct pt_regs *regs)
{
if (unlikely(fn))
fn(fn_arg);
syscall_exit_to_user_mode(regs);
}
int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
{
unsigned long clone_flags = args->flags;
@@ -242,7 +252,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
p->thread.riscv_v_flags = 0;
if (has_vector() || has_xtheadvector())
riscv_v_thread_alloc(p);
p->thread.ra = (unsigned long)ret_from_fork;
p->thread.ra = (unsigned long)ret_from_fork_asm;
p->thread.sp = (unsigned long)childregs; /* kernel sp */
return 0;
}