Messages in this thread Patch in this message | | | Date | Wed, 2 Jun 2021 23:12:26 +0800 | From | Jisheng Zhang <> | Subject | Re: [PATCH] riscv: mm: init: Consolidate vars, functions |
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On Tue, 1 Jun 2021 13:21:05 -0700 Nathan Chancellor <nathan@kernel.org> wrote:
> Hi Jisheng,
Hi Nathan,
> > On Sun, May 16, 2021 at 09:15:56PM +0800, Jisheng Zhang wrote: > > From: Jisheng Zhang <jszhang@kernel.org> > > > > Consolidate the following items in init.c > > > > Staticize global vars as much as possible; > > Add __initdata mark if the global var isn't needed after init > > Add __init mark if the func isn't needed after init > > Add __ro_after_init if the global var is read only after init > > > > Signed-off-by: Jisheng Zhang <jszhang@kernel.org> > > --- > > arch/riscv/include/asm/set_memory.h | 2 +- > > arch/riscv/mm/init.c | 36 +++++++++++++++-------------- > > 2 files changed, 20 insertions(+), 18 deletions(-) > > > > diff --git a/arch/riscv/include/asm/set_memory.h b/arch/riscv/include/asm/set_memory.h > > index 086f757e8ba3..9d4d455726d4 100644 > > --- a/arch/riscv/include/asm/set_memory.h > > +++ b/arch/riscv/include/asm/set_memory.h > > @@ -27,7 +27,7 @@ static inline int set_memory_rw_nx(unsigned long addr, int numpages) { return 0; > > #endif > > > > #if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX) > > -void protect_kernel_linear_mapping_text_rodata(void); > > +void __init protect_kernel_linear_mapping_text_rodata(void); > > #else > > static inline void protect_kernel_linear_mapping_text_rodata(void) {} > > #endif > > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c > > index 4c4c92ce0bb8..eac2d5c27b3e 100644 > > --- a/arch/riscv/mm/init.c > > +++ b/arch/riscv/mm/init.c > > @@ -53,7 +53,7 @@ struct pt_alloc_ops { > > #endif > > }; > > > > -static phys_addr_t dma32_phys_limit __ro_after_init; > > +static phys_addr_t dma32_phys_limit __initdata; > > > > static void __init zone_sizes_init(void) > > { > > @@ -184,7 +184,7 @@ extern char _sdata[], _edata[]; > > #endif /* CONFIG_XIP_KERNEL */ > > > > #ifdef CONFIG_MMU > > -static struct pt_alloc_ops _pt_ops __ro_after_init; > > +static struct pt_alloc_ops _pt_ops __initdata; > > > > #ifdef CONFIG_XIP_KERNEL > > #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&_pt_ops)) > > @@ -200,13 +200,13 @@ EXPORT_SYMBOL(va_pa_offset); > > #endif > > /* Offset between kernel mapping virtual address and kernel load address */ > > #ifdef CONFIG_64BIT > > -unsigned long va_kernel_pa_offset; > > +unsigned long va_kernel_pa_offset __ro_after_init; > > EXPORT_SYMBOL(va_kernel_pa_offset); > > #endif > > #ifdef CONFIG_XIP_KERNEL > > #define va_kernel_pa_offset (*((unsigned long *)XIP_FIXUP(&va_kernel_pa_offset))) > > #endif > > -unsigned long va_kernel_xip_pa_offset; > > +unsigned long va_kernel_xip_pa_offset __ro_after_init; > > EXPORT_SYMBOL(va_kernel_xip_pa_offset); > > #ifdef CONFIG_XIP_KERNEL > > #define va_kernel_xip_pa_offset (*((unsigned long *)XIP_FIXUP(&va_kernel_xip_pa_offset))) > > @@ -216,7 +216,7 @@ EXPORT_SYMBOL(pfn_base); > > > > pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; > > pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; > > -pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; > > +static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; > > > > pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); > > > > @@ -253,7 +253,7 @@ static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) > > return (pte_t *)set_fixmap_offset(FIX_PTE, pa); > > } > > > > -static inline pte_t *get_pte_virt_late(phys_addr_t pa) > > +static inline pte_t *__init get_pte_virt_late(phys_addr_t pa) > > { > > return (pte_t *) __va(pa); > > } > > @@ -272,7 +272,7 @@ static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) > > return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); > > } > > > > -static phys_addr_t alloc_pte_late(uintptr_t va) > > +static phys_addr_t __init alloc_pte_late(uintptr_t va) > > { > > unsigned long vaddr; > > > > @@ -296,10 +296,10 @@ static void __init create_pte_mapping(pte_t *ptep, > > > > #ifndef __PAGETABLE_PMD_FOLDED > > > > -pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; > > -pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; > > -pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); > > -pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); > > +static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; > > +static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; > > +static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); > > +static pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); > > > > #ifdef CONFIG_XIP_KERNEL > > #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd)) > > @@ -319,7 +319,7 @@ static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) > > return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); > > } > > > > -static pmd_t *get_pmd_virt_late(phys_addr_t pa) > > +static pmd_t *__init get_pmd_virt_late(phys_addr_t pa) > > { > > return (pmd_t *) __va(pa); > > } > > @@ -336,7 +336,7 @@ static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) > > return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); > > } > > > > -static phys_addr_t alloc_pmd_late(uintptr_t va) > > +static phys_addr_t __init alloc_pmd_late(uintptr_t va) > > { > > unsigned long vaddr; > > > > @@ -454,14 +454,16 @@ asmlinkage void __init __copy_data(void) > > #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." > > #endif > > > > -uintptr_t load_pa, load_sz; > > +static uintptr_t load_pa __initdata; > > Making load_pa static causing clang built kernels to no longer boot, > hanging after just a few lines of output in the console: > > https://github.com/ClangBuiltLinux/continuous-integration2/runs/2717606254?check_suite_focus=true > > I am not sure why that would make a difference nor why GCC is okay with > it. If it is a clang bug, it appears to be there for a while, given that > it reproduces back to clang-11.
I can reproduce the issue. Here are my findindings:
* gcc + binutils can't reproduce it * clang + llvm-utils + ias can reproduce it * clang + binutils can reproduce it
All below tests are done with clang + binutils.
Then I applied below modification:
-static uintptr_t load_pa __initdata; +uintptr_t load_pa __initdata;
I got below panic log: [ 0.015418] Unable to handle kernel paging request at virtual address fffffffffffffff9 [ 0.016432] Oops [#1] [ 0.016679] Modules linked in: [ 0.017103] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc1+ #5 [ 0.017711] Hardware name: riscv-virtio,qemu (DT) [ 0.018201] epc : trace_hardirqs_on+0x60/0xb2 [ 0.018582] ra : restore_all+0xe/0x66 [ 0.018879] epc : ffffffff800cb09a ra : ffffffff800027b8 sp : ffffffff80c03dd0 [ 0.019376] gp : ffffffff80d001c8 tp : ffffffff80c0c180 t0 : 0000000000000020 [ 0.019870] t1 : ffffffff80006e40 t2 : ffffffff800d2e0a s0 : ffffffff80c03e00 [ 0.020346] s1 : 0000000000000001 a0 : 0000000000000001 a1 : 0000000000000001 [ 0.020800] a2 : 0000000000000001 a3 : 0000000000000000 a4 : 0000000000000000 [ 0.021243] a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000054494d45 [ 0.021717] s2 : ffffffff800027b8 s3 : ffffffff80d35968 s4 : ffffffff8061e1d8 [ 0.022179] s5 : ffffffff80c0c180 s6 : ffffffe000e34b50 s7 : 00000000800130f0 [ 0.022674] s8 : 000000000000007f s9 : 0000000080012010 s10: 0000000000000000 [ 0.023176] s11: 0000000000000000 t3 : ffffffff80d00108 t4 : ffffffff80006e40 [ 0.023693] t5 : ffffffff80006e40 t6 : ffffffff800d2e0a [ 0.024153] status: 0000000000000100 badaddr: fffffffffffffff9 cause: 000000000000000d [ 0.025367] Call Trace: [ 0.025749] [<ffffffff800cb09a>] trace_hardirqs_on+0x60/0xb2 [ 0.026402] [<ffffffff800027b8>] restore_all+0xe/0x66 [ 0.027261] Unable to handle kernel paging request at virtual address fffffffffffffffa [ 0.027827] Oops [#2] [ 0.028013] Modules linked in: [ 0.028321] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G D 5.13.0-rc1+ #5 [ 0.028839] Hardware name: riscv-virtio,qemu (DT) [ 0.029166] epc : trace_hardirqs_on+0x60/0xb2 [ 0.029505] ra : restore_all+0xe/0x66 [ 0.029785] epc : ffffffff800cb09a ra : ffffffff800027b8 sp : ffffffff80c03a80 [ 0.030266] gp : ffffffff80d001c8 tp : ffffffff80c0c180 t0 : 0000000000000020 [ 0.030748] t1 : ffffffff80006e40 t2 : ffffffff800d2e0a s0 : ffffffff80c03ab0 [ 0.031227] s1 : 0000000000000001 a0 : 0000000000000002 a1 : 0000000000000002 [ 0.031717] a2 : 0000000000000001 a3 : 0000000000000000 a4 : 0000000000000000 [ 0.032199] a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000054494d45 [ 0.032680] s2 : ffffffff800027b8 s3 : ffffffff80d35968 s4 : ffffffff8061e1d8 [ 0.033160] s5 : ffffffff80c0c180 s6 : ffffffe000e34b50 s7 : 00000000800130f0 [ 0.033642] s8 : 000000000000007f s9 : 0000000080012010 s10: 0000000000000000 [ 0.034123] s11: 0000000000000000 t3 : ffffffff80d00108 t4 : ffffffff80006e40 [ 0.034601] t5 : ffffffff80006e40 t6 : ffffffff800d2e0a [ 0.034965] status: 0000000000000100 badaddr: fffffffffffffffa cause: 000000000000000d [ 0.035492] Call Trace: [ 0.035682] [<ffffffff800cb09a>] trace_hardirqs_on+0x60/0xb2 [ 0.036077] [<ffffffff800027b8>] restore_all+0xe/0x66 [ 0.036545] ---[ end trace 7f4fbff09d927668 ]--- [ 0.037188] Kernel panic - not syncing: Attempted to kill the idle task! [ 0.038107] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---
Then I checked 5.13-rc1, above panic log can be reproduced too. So the issue should exist there for a while. I never tried clang with riscv, did you remember which last commit or version clang works, I may try to bisect.
Thanks
> > If I can provide any more information or help debug, let me know! > > Cheers, > Nathan > > > +static uintptr_t load_sz __initdata; > > #ifdef CONFIG_XIP_KERNEL > > #define load_pa (*((uintptr_t *)XIP_FIXUP(&load_pa))) > > #define load_sz (*((uintptr_t *)XIP_FIXUP(&load_sz))) > > #endif > > > > #ifdef CONFIG_XIP_KERNEL > > -uintptr_t xiprom, xiprom_sz; > > +static uintptr_t xiprom __inidata; > > +static uintptr_t xiprom_sz __initdata; > > #define xiprom_sz (*((uintptr_t *)XIP_FIXUP(&xiprom_sz))) > > #define xiprom (*((uintptr_t *)XIP_FIXUP(&xiprom))) > > > > @@ -646,7 +648,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa) > > } > > > > #if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX) > > -void protect_kernel_linear_mapping_text_rodata(void) > > +void __init protect_kernel_linear_mapping_text_rodata(void) > > { > > unsigned long text_start = (unsigned long)lm_alias(_start); > > unsigned long init_text_start = (unsigned long)lm_alias(__init_text_begin); > > @@ -858,7 +860,7 @@ static void __init reserve_crashkernel(void) > > * reserved once we call early_init_fdt_scan_reserved_mem() > > * later on. > > */ > > -static int elfcore_hdr_setup(struct reserved_mem *rmem) > > +static int __init elfcore_hdr_setup(struct reserved_mem *rmem) > > { > > elfcorehdr_addr = rmem->base; > > elfcorehdr_size = rmem->size; > > -- > > 2.31.0 > >
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