Subject: [PATCH 1/2] Fix "[v3, 25/32] powerpc/64: system call implement entry/exit logic in C"

From: Nicholas Piggin <[email-masked]>
Date: Mon, 23 Mar 2020 15:44:08 +1000

Changes Christophe asked for to help ppc32 implementation, and move a
stray hunk into a later patch.

Signed-off-by: Nicholas Piggin <[email-masked]>
---
 arch/powerpc/include/asm/asm-prototypes.h |  4 ---
 arch/powerpc/include/asm/cputime.h        | 38 +++++++++++++----------
 2 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/arch/powerpc/include/asm/asm-prototypes.h b/arch/powerpc/include/asm/asm-prototypes.h
index 4b3609554e76..ab59a4904254 100644
--- a/arch/powerpc/include/asm/asm-prototypes.h
+++ b/arch/powerpc/include/asm/asm-prototypes.h
@@ -97,12 +97,8 @@ ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp,
 unsigned long __init early_init(unsigned long dt_ptr);
 void __init machine_init(u64 dt_ptr);
 #endif
-#ifdef CONFIG_PPC64
 long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8, unsigned long r0, struct pt_regs *regs);
 notrace unsigned long syscall_exit_prepare(unsigned long r3, struct pt_regs *regs);
-notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned long msr);
-notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsigned long msr);
-#endif
 
 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
 		      u32 len_high, u32 len_low);
diff --git a/arch/powerpc/include/asm/cputime.h b/arch/powerpc/include/asm/cputime.h
index 6639a6847cc0..0fccd5ea1e9a 100644
--- a/arch/powerpc/include/asm/cputime.h
+++ b/arch/powerpc/include/asm/cputime.h
@@ -43,8 +43,26 @@ static inline unsigned long cputime_to_usecs(const cputime_t ct)
  */
 #ifdef CONFIG_PPC64
 #define get_accounting(tsk)	(&get_paca()->accounting)
+#define raw_get_accounting(tsk)	(&local_paca->accounting)
 static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
 
+#else
+#define get_accounting(tsk)	(&task_thread_info(tsk)->accounting)
+#define raw_get_accounting(tsk)	get_accounting(tsk)
+/*
+ * Called from the context switch with interrupts disabled, to charge all
+ * accumulated times to the current process, and to prepare accounting on
+ * the next process.
+ */
+static inline void arch_vtime_task_switch(struct task_struct *prev)
+{
+	struct cpu_accounting_data *acct = get_accounting(current);
+	struct cpu_accounting_data *acct0 = get_accounting(prev);
+
+	acct->starttime = acct0->starttime;
+}
+#endif
+
 /*
  * account_cpu_user_entry/exit runs "unreconciled", so can't trace,
  * can't use use get_paca()
@@ -52,35 +70,21 @@ static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
 static notrace inline void account_cpu_user_entry(void)
 {
 	unsigned long tb = mftb();
-	struct cpu_accounting_data *acct = &local_paca->accounting;
+	struct cpu_accounting_data *acct = raw_get_accounting(current);
 
 	acct->utime += (tb - acct->starttime_user);
 	acct->starttime = tb;
 }
+
 static notrace inline void account_cpu_user_exit(void)
 {
 	unsigned long tb = mftb();
-	struct cpu_accounting_data *acct = &local_paca->accounting;
+	struct cpu_accounting_data *acct = raw_get_accounting(current);
 
 	acct->stime += (tb - acct->starttime);
 	acct->starttime_user = tb;
 }
 
-#else
-#define get_accounting(tsk)	(&task_thread_info(tsk)->accounting)
-/*
- * Called from the context switch with interrupts disabled, to charge all
- * accumulated times to the current process, and to prepare accounting on
- * the next process.
- */
-static inline void arch_vtime_task_switch(struct task_struct *prev)
-{
-	struct cpu_accounting_data *acct = get_accounting(current);
-	struct cpu_accounting_data *acct0 = get_accounting(prev);
-
-	acct->starttime = acct0->starttime;
-}
-#endif
 
 #endif /* __KERNEL__ */
 #else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
-- 
2.23.0