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| author | Shanker Donthineni | 2017-02-23 04:10:48 +0100 |
|---|---|---|
| committer | Will Deacon | 2017-02-24 11:55:31 +0100 |
| commit | ea6eac904f0a5a0c223bcfb133ec880ba9c70ae3 (patch) | |
| tree | 378e05fa48ffe527b80b8f12bec6808ef3a5e46c /fs/btrfs/ulist.h | |
| parent | arm64/kprobes: consistently handle MRS/MSR with XZR (diff) | |
| download | kernel-qcow2-linux-ea6eac904f0a5a0c223bcfb133ec880ba9c70ae3.tar.gz kernel-qcow2-linux-ea6eac904f0a5a0c223bcfb133ec880ba9c70ae3.tar.xz kernel-qcow2-linux-ea6eac904f0a5a0c223bcfb133ec880ba9c70ae3.zip | |
arm64: Avoid clobbering mm in erratum workaround on QDF2400
Commit 38fd94b0275c ("arm64: Work around Falkor erratum 1003") tried to
work around a hardware erratum, but actually caused a system crash of
its own during switch_mm:
cpu_do_switch_mm+0x20/0x40
efi_virtmap_load+0x34/0x40
virt_efi_get_next_variable+0x64/0xc8
efivar_init+0x8c/0x348
efisubsys_init+0xd4/0x270
do_one_initcall+0x80/0x110
kernel_init_freeable+0x19c/0x240
kernel_init+0x10/0x100
ret_from_fork+0x10/0x50
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
In cpu_do_switch_mm, x1 contains the mm_struct pointer, which needs to
be preserved by the pre_ttbr0_update_workaround macro rather than passed
as a temporary.
This patch clobbers x2 and x3 instead, keeping the mm_struct intact
after the workaround has run.
Fixes: 38fd94b0275c ("arm64: Work around Falkor erratum 1003")
Tested-by: Manoj Iyer <manoj.iyer@canonical.com>
Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'fs/btrfs/ulist.h')
0 files changed, 0 insertions, 0 deletions