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Michael Ellerman 40fe1917ea powerpc/pseries: Fix dtl_access_lock to be a rw_semaphore 
[ Upstream commit cadae3a45d23aa4f6485938a67cbc47aaaa25e38 ]

The dtl_access_lock needs to be a rw_sempahore, a sleeping lock, because
the code calls kmalloc() while holding it, which can sleep:

  # echo 1 > /proc/powerpc/vcpudispatch_stats
  BUG: sleeping function called from invalid context at include/linux/sched/mm.h:337
  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 199, name: sh
  preempt_count: 1, expected: 0
  3 locks held by sh/199:
   #0: c00000000a0743f8 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x324/0x438
   #1: c0000000028c7058 (dtl_enable_mutex){+.+.}-{3:3}, at: vcpudispatch_stats_write+0xd4/0x5f4
   #2: c0000000028c70b8 (dtl_access_lock){+.+.}-{2:2}, at: vcpudispatch_stats_write+0x220/0x5f4
  CPU: 0 PID: 199 Comm: sh Not tainted 6.10.0-rc4 #152
  Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries
  Call Trace:
    dump_stack_lvl+0x130/0x148 (unreliable)
    __might_resched+0x174/0x410
    kmem_cache_alloc_noprof+0x340/0x3d0
    alloc_dtl_buffers+0x124/0x1ac
    vcpudispatch_stats_write+0x2a8/0x5f4
    proc_reg_write+0xf4/0x150
    vfs_write+0xfc/0x438
    ksys_write+0x88/0x148
    system_call_exception+0x1c4/0x5a0
    system_call_common+0xf4/0x258

Fixes: 06220d78f24a ("powerpc/pseries: Introduce rwlock to gatekeep DTLB usage")
Tested-by: Kajol Jain <kjain@linux.ibm.com>
Reviewed-by: Nysal Jan K.A <nysal@linux.ibm.com>
Reviewed-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20240819122401.513203-1-mpe@ellerman.id.au
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-12-17 13:24:08 +01:00
..
alpha Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
arc ARC: [plat-hsdk]: Remove misplaced interrupt-cells property 2024-11-19 11:32:36 +01:00
arm ARM: dts: cubieboard4: Fix DCDC5 regulator constraints 2024-12-17 13:24:03 +01:00
arm64 arm64: fix .data.rel.ro size assertion when CONFIG_LTO_CLANG 2024-12-17 13:23:59 +01:00
c6x Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
csky csky, hexagon: fix broken sys_sync_file_range 2024-11-19 14:19:34 +01:00
h8300 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
hexagon hexagon: fix fadvise64_64 calling conventions 2024-11-19 14:19:34 +01:00
ia64 efi: ia64: move IA64-only declarations to new asm/efi.h header 2024-11-19 14:19:45 +01:00
m68k m68k: mvme147: Reinstate early console 2024-12-17 13:23:59 +01:00
microblaze Revert "microblaze: don't treat zero reserved memory regions as error" 2024-11-24 00:23:33 +01:00
mips clkdev: remove CONFIG_CLKDEV_LOOKUP 2024-12-17 13:24:00 +01:00
nds32 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
nios2 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
openrisc openrisc: Call setup_memory() earlier in the init sequence 2024-11-23 23:20:47 +01:00
parisc Revert "parisc: Fix itlb miss handler for 64-bit programs" 2024-11-24 00:23:05 +01:00
powerpc powerpc/pseries: Fix dtl_access_lock to be a rw_semaphore 2024-12-17 13:24:08 +01:00
riscv Revert "riscv: Fix fp alignment bug in perf_callchain_user()" 2024-11-24 00:23:20 +01:00
s390 s390/syscalls: Avoid creation of arch/arch/ directory 2024-12-17 13:23:59 +01:00
sh clkdev: remove CONFIG_CLKDEV_LOOKUP 2024-12-17 13:24:00 +01:00
sparc sparc64: Fix incorrect function signature and add prototype for prom_cif_init 2024-11-23 23:20:10 +01:00
um Revert "um: line: always fill *error_out in setup_one_line()" 2024-11-24 00:23:40 +01:00
x86 x86/xen/pvh: Annotate indirect branch as safe 2024-12-17 13:23:58 +01:00
xtensa Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Kconfig cpu: Re-enable CPU mitigations by default for !X86 architectures 2024-11-19 11:32:38 +01:00