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| author | Guo Ren <guoren@linux.alibaba.com> | 2020-05-13 17:16:26 +0800 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2020-05-13 17:55:06 +0800 |
| commit | 9e2ca15322acc5a0a697305e02af9ce5ac881f66 (patch) | |
| tree | 96ac36843530a82b31e32d36999e9f185d0d8586 | |
| parent | 6633a5aa8eb6bda70eb3a9837efd28a67ccc6e0a (diff) | |
| download | linux-9e2ca15322acc5a0a697305e02af9ce5ac881f66.tar.gz | |
csky: Fixup remove unnecessary save/restore PSR code
All processes' PSR could success from SETUP_MMU, so need set it
in INIT_THREAD again.
And use a3 instead of r7 in __switch_to for code convention.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
| -rw-r--r-- | arch/csky/include/asm/processor.h | 2 | ||||
| -rw-r--r-- | arch/csky/kernel/asm-offsets.c | 1 | ||||
| -rw-r--r-- | arch/csky/kernel/entry.S | 10 |
3 files changed, 2 insertions, 11 deletions
diff --git a/arch/csky/include/asm/processor.h b/arch/csky/include/asm/processor.h index c6bcd7f7c720bb..79eaaaed3d2350 100644 --- a/arch/csky/include/asm/processor.h +++ b/arch/csky/include/asm/processor.h @@ -42,7 +42,6 @@ extern struct cpuinfo_csky cpu_data[]; struct thread_struct { unsigned long ksp; /* kernel stack pointer */ - unsigned long sr; /* saved status register */ unsigned long trap_no; /* saved status register */ /* FPU regs */ @@ -51,7 +50,6 @@ struct thread_struct { #define INIT_THREAD { \ .ksp = sizeof(init_stack) + (unsigned long) &init_stack, \ - .sr = DEFAULT_PSR_VALUE, \ } /* diff --git a/arch/csky/kernel/asm-offsets.c b/arch/csky/kernel/asm-offsets.c index f8be348df9e49a..bbc259eed23395 100644 --- a/arch/csky/kernel/asm-offsets.c +++ b/arch/csky/kernel/asm-offsets.c @@ -19,7 +19,6 @@ int main(void) /* offsets into the thread struct */ DEFINE(THREAD_KSP, offsetof(struct thread_struct, ksp)); - DEFINE(THREAD_SR, offsetof(struct thread_struct, sr)); DEFINE(THREAD_FESR, offsetof(struct thread_struct, user_fp.fesr)); DEFINE(THREAD_FCR, offsetof(struct thread_struct, user_fp.fcr)); DEFINE(THREAD_FPREG, offsetof(struct thread_struct, user_fp.vr)); diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S index 6a468ff7543213..3760397fdd3d9e 100644 --- a/arch/csky/kernel/entry.S +++ b/arch/csky/kernel/entry.S @@ -330,9 +330,6 @@ ENTRY(__switch_to) lrw a3, TASK_THREAD addu a3, a0 - mfcr a2, psr /* Save PSR value */ - stw a2, (a3, THREAD_SR) /* Save PSR in task struct */ - SAVE_SWITCH_STACK stw sp, (a3, THREAD_KSP) @@ -343,12 +340,9 @@ ENTRY(__switch_to) ldw sp, (a3, THREAD_KSP) /* Set next kernel sp */ - ldw a2, (a3, THREAD_SR) /* Set next PSR */ - mtcr a2, psr - #if defined(__CSKYABIV2__) - addi r7, a1, TASK_THREAD_INFO - ldw tls, (r7, TINFO_TP_VALUE) + addi a3, a1, TASK_THREAD_INFO + ldw tls, (a3, TINFO_TP_VALUE) #endif RESTORE_SWITCH_STACK |