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| author |   Peter Zijlstra <peterz@infradead.org> | 2020-10-27 10:15:05 +0100 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2020-10-27 23:15:23 +0100 |
| commit | 2a9baf5ad4884108b3c6d56a50e8105ccf8a4ee7 (patch) | |
| tree | bc9ec3a80992bfac570f35708959deb34210848b /drivers/usb/cdns3/cdns3-imx.c | |
| parent | Merge tag 'x86-urgent-2020-10-27' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (diff) | |
| download | linux-dev-2a9baf5ad4884108b3c6d56a50e8105ccf8a4ee7.tar.xz linux-dev-2a9baf5ad4884108b3c6d56a50e8105ccf8a4ee7.zip | |
x86/debug: Fix BTF handling
The SDM states that #DB clears DEBUGCTLMSR_BTF, this means that when the
bit is set for userspace (TIF_BLOCKSTEP) and a kernel #DB happens first,
the BTF bit meant for userspace execution is lost.
Have the kernel #DB handler restore the BTF bit when it was requested
for userspace.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Kyle Huey <me@kylehuey.com>
Link: https://lore.kernel.org/r/20201027093607.956147736@infradead.org
Diffstat (limited to 'drivers/usb/cdns3/cdns3-imx.c')
0 files changed, 0 insertions, 0 deletions