projects / platform / kernel / linux-rpi.git / commit
? search:
summary | shortlog | log | commit | commitdiff | tree
(parent: 22fe5b0) | patch
x86/ioperm: Remove bitmap if all permissions dropped
authorThomas Gleixner <tglx@linutronix.de>
Mon, 11 Nov 2019 22:03:24 +0000 (23:03 +0100)
committerThomas Gleixner <tglx@linutronix.de>
Sat, 16 Nov 2019 10:24:03 +0000 (11:24 +0100)
commitea5f1cd7ab494f65f50f338299eabb40ad6a1767
tree4e9addcdf5873dbac21bbe70aadb312760b55a87tree | snapshot
parent22fe5b0439dd53643fd6f4c582c46c6dba0fde53commit | diff
x86/ioperm: Remove bitmap if all permissions dropped

If ioperm() results in a bitmap with all bits set (no permissions to any
I/O port), then handling that bitmap on context switch and exit to user
mode is pointless. Drop it.

Move the bitmap exit handling to the ioport code and reuse it for both the
thread exit path and dropping it. This allows to reuse this code for the
upcoming iopl() emulation.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Andy Lutomirski <luto@kernel.org>
arch/x86/include/asm/io_bitmap.h diff | blob | history
arch/x86/kernel/ioport.c diff | blob | history
arch/x86/kernel/process.c diff | blob | history
Domain: System / Kernel;