• Guenter Roeck's avatar
    powerpc/mm: Call flush_tlb_kernel_range with interrupts enabled · 7c6a4f3b
    Guenter Roeck authored
    flush_tlb_kernel_range() may call smp_call_function_many() which expects
    interrupts to be enabled. This results in a traceback.
    
    WARNING: CPU: 0 PID: 1 at kernel/smp.c:416 smp_call_function_many+0xcc/0x2fc
    CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.0-rc1-00009-g0666f560 #1
    task: cf830000 task.stack: cf82e000
    NIP:  c00a93c8 LR: c00a9634 CTR: 00000001
    REGS: cf82fde0 TRAP: 0700   Not tainted  (4.14.0-rc1-00009-g0666f560)
    MSR:  00021000 <CE,ME>  CR: 24000082  XER: 00000000
    
    GPR00: c00a9634 cf82fe90 cf830000 c050ad3c c0015a54 00000000 00000001 00000001
    GPR08: 00000001 00000000 00000000 cf82e000 24000084 00000000 c0003150 00000000
    GPR16: 00000000 00000000 00000000 00000000 00000000 00000001 00000000 c0510000
    GPR24: 00000000 c0015a54 00000000 c050ad3c c051823c c050ad3c 00000025 00000000
    NIP [c00a93c8] smp_call_function_many+0xcc/0x2fc
    LR [c00a9634] smp_call_function+0x3c/0x50
    Call Trace:
    [cf82fe90] [00000010] 0x10 (unreliable)
    [cf82fed0] [c00a9634] smp_call_function+0x3c/0x50
    [cf82fee0] [c0015d2c] flush_tlb_kernel_range+0x20/0x38
    [cf82fef0] [c001524c] mark_initmem_nx+0x154/0x16c
    [cf82ff20] [c001484c] free_initmem+0x20/0x4c
    [cf82ff30] [c000316c] kernel_init+0x1c/0x108
    [cf82ff40] [c000f3a8] ret_from_kernel_thread+0x5c/0x64
    Instruction dump:
    7c0803a6 7d808120 38210040 4e800020 3d20c052 812981a0 2f890000 40beffac
    3d20c051 8929ac64 2f890000 40beff9c <0fe00000> 4bffff94 7fc3f378 7f64db78
    
    Fixes: 3184cc4b ("powerpc/mm: Fix kernel RAM protection after freeing ...")
    Fixes: e611939f ("powerpc/mm: Ensure change_page_attr() doesn't ...")
    Cc: Christophe Leroy <christophe.leroy@c-s.fr>
    Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
    Reviewed-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    7c6a4f3b
pgtable_32.c 9.75 KB