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| author | Yousong Zhou <yszhou4tech@gmail.com> | 2020-03-24 23:27:51 +0800 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2020-03-25 16:07:14 +0100 |
| commit | aebdc6ff3b2e79327d8eff7c0e2d835bb1d3221f (patch) | |
| tree | 552a6b0f7ecd3f37dc938ec704f84f53835858e1 /arch/mips/kernel | |
| parent | d191aaffe3687d1e73e644c185f5f0550ec242b5 (diff) | |
| download | linux-aebdc6ff3b2e79327d8eff7c0e2d835bb1d3221f.tar.bz2 | |
MIPS: Exclude more dsemul code when CONFIG_MIPS_FP_SUPPORT=n
This furthers what commit 42b10815d559 ("MIPS: Don't compile math-emu
when CONFIG_MIPS_FP_SUPPORT=n") has done
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/process.c | 10 | ||||
| -rw-r--r-- | arch/mips/kernel/vdso.c | 26 |
2 files changed, 23 insertions, 13 deletions
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 339870ed92f7..b2a797557825 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -75,7 +75,9 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp) lose_fpu(0); clear_thread_flag(TIF_MSA_CTX_LIVE); clear_used_math(); +#ifdef CONFIG_MIPS_FP_SUPPORT atomic_set(¤t->thread.bd_emu_frame, BD_EMUFRAME_NONE); +#endif init_dsp(); regs->cp0_epc = pc; regs->regs[29] = sp; @@ -176,7 +178,9 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long usp, clear_tsk_thread_flag(p, TIF_FPUBOUND); #endif /* CONFIG_MIPS_MT_FPAFF */ +#ifdef CONFIG_MIPS_FP_SUPPORT atomic_set(&p->thread.bd_emu_frame, BD_EMUFRAME_NONE); +#endif if (clone_flags & CLONE_SETTLS) ti->tp_value = tls; @@ -650,8 +654,10 @@ unsigned long mips_stack_top(void) { unsigned long top = TASK_SIZE & PAGE_MASK; - /* One page for branch delay slot "emulation" */ - top -= PAGE_SIZE; + if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT)) { + /* One page for branch delay slot "emulation" */ + top -= PAGE_SIZE; + } /* Space for the VDSO, data page & GIC user page */ top -= PAGE_ALIGN(current->thread.abi->vdso->size); diff --git a/arch/mips/kernel/vdso.c b/arch/mips/kernel/vdso.c index bc35f8499111..3adb7354bc01 100644 --- a/arch/mips/kernel/vdso.c +++ b/arch/mips/kernel/vdso.c @@ -71,10 +71,12 @@ subsys_initcall(init_vdso); static unsigned long vdso_base(void) { - unsigned long base; + unsigned long base = STACK_TOP; - /* Skip the delay slot emulation page */ - base = STACK_TOP + PAGE_SIZE; + if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT)) { + /* Skip the delay slot emulation page */ + base += PAGE_SIZE; + } if (current->flags & PF_RANDOMIZE) { base += get_random_int() & (VDSO_RANDOMIZE_SIZE - 1); @@ -95,14 +97,16 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) if (down_write_killable(&mm->mmap_sem)) return -EINTR; - /* Map delay slot emulation page */ - base = mmap_region(NULL, STACK_TOP, PAGE_SIZE, - VM_READ | VM_EXEC | - VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC, - 0, NULL); - if (IS_ERR_VALUE(base)) { - ret = base; - goto out; + if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT)) { + /* Map delay slot emulation page */ + base = mmap_region(NULL, STACK_TOP, PAGE_SIZE, + VM_READ | VM_EXEC | + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC, + 0, NULL); + if (IS_ERR_VALUE(base)) { + ret = base; + goto out; + } } /* |