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[WIP] [Deepin-Kernel-SIG] [linux 6.6-y] [Deepin] Loongarch: optimize syscall reg save #881

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[WIP] [Deepin-Kernel-SIG] [linux 6.6-y] [Deepin] Loongarch: optimize syscall reg save #881

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3 changes: 2 additions & 1 deletion arch/loongarch/kernel/entry.S
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,8 @@ SYM_CODE_START(handle_syscall)
addi.d sp, sp, -PT_SIZE
cfi_st t2, PT_R3
cfi_rel_offset sp, PT_R3
st.d zero, sp, PT_R0
# Note it will be set in do_syscall regs->regs[0] = 0;
# st.d zero, sp, PT_R0
csrrd t2, LOONGARCH_CSR_PRMD
st.d t2, sp, PT_PRMD
csrrd t2, LOONGARCH_CSR_CRMD
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2 changes: 2 additions & 0 deletions arch/loongarch/kernel/syscall.c
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Expand Up @@ -44,6 +44,8 @@ void noinstr do_syscall(struct pt_regs *regs)
sys_call_fn syscall_fn;

nr = regs->regs[11];
// Move from handle_syscall macro to save a memio
regs->regs[0] = 0;
/* Set for syscall restarting */
if (nr < NR_syscalls)
regs->regs[0] = nr + 1;
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